Hey guys, I would like to know anybody with the same problem. About two months ago I pulled into a gas station and filled up my truck (made sure it was ultra low sulfur), simply got in the truck, started it up and the check engine light was on and was in limp mode. Needless to say i limped it to the nearest dealership 22 miles away with alot of pissed off people behind me. Two days later they called me and told me it was fixed. They did a simple computer program download. Six weeks later I drove 800 miles to the Florida keys pulling my trailer (approx. 6000 lbs.) with no problems. When I was getting ready to head back I topped off the tank (again with ultra low sulfur), I just got on the highway and it went into limp mode again and left me stranded on the side of the road. It had to be towed to the nearest dealer 38 miles away (Homestead Florida). They would NOT give me a loner car or a rental car for 5 days. After 5 days of sitting around with no transportation, the dealership called me and told me it was fixed. I got a ride to the dealer, they gave me a invoice stating it recieved another computer download (no parts). i left the dealership to go hook up my trailer 38 miles away and head home...... I made it 12 miles. When I was passing a vehicle the check engine light came on again and I lost all power (it would only idle). It had to be towed again, the dealership was closed (no rental car, no loner again). 5 days have passed and I'm still sitting here in the keys with no truck. The only modifications to this truck is a 4" tailpipe turn down, and a k&N air filter. The dealer contacted me today and told me "they found the problem", they said that it is my K&N filter that has caused all the problems, they said I need a new mass airflow sensor and a stock filter. Gunna cost me $600!!! we'll see about that.

So here I sit, waiting to go home. any ideas??

Sounds like there right, K&N filters have caused all kinds of problems to these trucks.

there is a good chance they are correct, i had that happen a few times with my 05.. had to much oil on the k/n filter.. but i had my scanner with me so i could fix on the road//

same here with my 96 chev...too much oil ruined the mass air flow sensor....no more k&n for me...

K&N = Bad :( your MAF no likey

Looks like you are another victim of the K&N oil saga. I'm surprised the other two times the dealers didn't identify the problem. Pay to get it fixed - and throw the K&N in the dealer's dumpster on the way out.

I doubt you will get much sympathy from the GM warranty dept but you can try...

Will a bad MAF cause it to go into Limp mode?

Cant they just clean the MAF? I know on the gas trucks you can with electrical connector cleaner.

I contacted K&N personally and talked to a woman named Arlene, she's in a division of the company that represents them legaly. She said if their filter was the direct cause of this problem, that they would pay the bill and prove GM wronge legaly. what do you think?

K&N told me that CNC made a MAF spray cleaner i could use, and yes it will cause it to go into limp mode.

I contacted K&N personally and talked to a woman named Arlene, she's in a division of the company that represents them legaly. She said if their filter was the direct cause of this problem, that they would pay the bill and prove GM wronge legaly. what do you think?

Sorry to hear that but the expenses involved trying to definitively prove that K&N was at fault could be enormous expense and a waist of time. It'll be a "he said"/"she said" all the way.

I personally hate K&N filters. I've never seen a performance benefit and risking a warranty just isn't worth it.

Removed MANY k&n's in trucks/cars at my dealer for issue's....it can get expensive, I am surprized that the other dealer didn't call that first, may have saved you some grief....if you put it back to oem and the problem is gone, then you know that it was the aftermarket device that cost you time and money....

How long or how many miles had you driven before it went into Limp the frist time?
Thanks, Larry

good luck trying to get that covered...another reason NOT to use oiled filters

I don't think it's JUST K&N, I think any filter requiring oil of some sort will cause this and yes the truck will limp. As far an after-market filter for the price you pay to get A LITTLE MORE airflow it's not worth it. The factory filter catches alot more particles that most aftermarket intakes!

Did anyone else have this problem with the LMM limp mode?

I did on my second day of vacation last month at 8400 kms. Dealer told me that there's a known computer glitch that GM is working on - new program should be out already. They could have cleared the code for me but probly would have happened again. They built a "one-off" program for my truck and 6days into vacation I had my truck back. Ive put 4000 kms on since with no problems. Yeah its still stock.

whoever had problems with their K&N filters musted have their filters drenched in oil. A little goes a long way here. I've had their filters on every vehicle that i've owned and never had a hiccup once....

The first time it went into limp it had 2000 miles, the second time it had 7000, third time it had 7600. About 300 miles on the K&N filter. I'm in the commercial marine business and buy several vehicles a year and I have run K&N filters on all of my vehicles without any problems for the past 15 years. This is the first.

I’m glad I read about K&N filters before I bought my truck.

The first time it went into limp it had 2000 miles, the second time it had 7000, third time it had 7600. About 300 miles on the K&N filter. I'm in the commercial marine business and buy several vehicles a year and I have run K&N filters on all of my vehicles without any problems for the past 15 years. This is the first.

As Salmandmax said, with the new filters and air boxes on the LLY/LBZ and the new LMM you really don't need an aftermarket filter. Do a search on the PPE airbox gutting and go over that. It is just as effective and is a lot cheaper.

i have an lly and i forgot to plug my MAF sensor back in when i installed my k&n filter and it ran fine but the service engine soon light did come on

what about a AFE setup??? DOn't they use a oil-less filter???

what about a AFE setup??? DOn't they use a oil-less filter???

I've got the AFE Pro Dry S drop in filter. Seems to work just fine and the best part, there's no oil. :D

-Ronnie

So I went back to the dealer today and they put all the stock parts back on, New stock filter, new MAF, and tailpipe. They rebooted the computer and now its still throwing codes without even leaving the parking lot. I'v been stuck down here for 11 days.... time to get home. I'm gunna be scared to even try to drive it 800 miles....

:banghead:

Have used K&N filters on all kinds of stuff. I'm thinking about taking my "Airaid" intake and filter off and putting the stock stuff back on, just because I have read so much about oil filters causing problems. That said I have 17,000 miles on my truck and intake system and I have had zero problems. May be a bit heavy on the oil. I'm also thinking the dealer is trying to write off more serious problems as "your fault"
Good luck with the truck either way.

ive run k&n in everything and never had a problem, its nice to have the stock filter for the one day it takes to clean the filter. but i think ya got a lemon there

tell them to call TAC..... I really hate you are having problems, this sounds crazy....

i got a stock lbz air box if you want it :)

So I went back to the dealer today and they put all the stock parts back on, New stock filter, new MAF, and tailpipe. They rebooted the computer and now its still throwing codes without even leaving the parking lot. I'v been stuck down here for 11 days.... time to get home. I'm gunna be scared to even try to drive it 800 miles....

It doesn't sound like it is the K&N that caused the problem than. It looks like they just bought you all of those parts for free and still need to fix it. 3 times for the same problem. You could press it and make them give you a new truck.

well, the dealer call me yesterday and said my truck was ready again. I went up there and they told me they put a NEW computer tune on it and replaced the K&N with the stock filter. they drove it 30 mile with out any problems.. I have the truck now and it seems to be doing good, but we'll see how she does on a 800 mile run back home....

I have had this happened to me 4 times my dealer has given me a rental each time. A Suburban or the new crossover GM. Next time that happens try cyclying your key three times or disconect the battery for 15 minutes either will clear the computer and let you keep going. My truck was purchased in Texas but my service dealership is Cal. Both my service dealer ship and my purchases dealership assure me there is not problem.
Sounds like there is a problem if you look on these boards. My purchase dealership told me the reason it happened the first time was because i faild to shut off and the turn the fuel cap three times when I replaced it and it sent a code. Lets let the schmucks at GM that say there is no problem load uo a load of their family and loved ones pulling a RV or horse trailer and then shut down to 20 mph on a freeway miles away from home. I sure they would think there is a problem. Dont think I am a GM hater this is my third scince 04 after I turned in 2 Ford 6.0 dogs. THe previous two were awesome.



Hey guys, I would like to know anybody with the same problem. About two months ago I pulled into a gas station and filled up my truck (made sure it was ultra low sulfur), simply got in the truck, started it up and the check engine light was on and was in limp mode. Needless to say i limped it to the nearest dealership 22 miles away with alot of pissed off people behind me. Two days later they called me and told me it was fixed. They did a simple computer program download. Six weeks later I drove 800 miles to the Florida keys pulling my trailer (approx. 6000 lbs.) with no problems. When I was getting ready to head back I topped off the tank (again with ultra low sulfur), I just got on the highway and it went into limp mode again and left me stranded on the side of the road. It had to be towed to the nearest dealer 38 miles away (Homestead Florida). They would NOT give me a loner car or a rental car for 5 days. After 5 days of sitting around with no transportation, the dealership called me and told me it was fixed. I got a ride to the dealer, they gave me a invoice stating it recieved another computer download (no parts). i left the dealership to go hook up my trailer 38 miles away and head home...... I made it 12 miles. When I was passing a vehicle the check engine light came on again and I lost all power (it would only idle). It had to be towed again, the dealership was closed (no rental car, no loner again). 5 days have passed and I'm still sitting here in the keys with no truck. The only modifications to this truck is a 4" tailpipe turn down, and a k&N air filter. The dealer contacted me today and told me "they found the problem", they said that it is my K&N filter that has caused all the problems, they said I need a new mass airflow sensor and a stock filter. Gunna cost me $600!!! we'll see about that.

So here I sit, waiting to go home. any ideas??

2007 LMM , same problem , no K+N, all stock except ppe , power shuts down and reads reduced engine power

I have had this happened to me 4 times my dealer has given me a rental each time. A Suburban or the new crossover GM. Next time that happens try cyclying your key three times or disconect the battery for 15 minutes either will clear the computer and let you keep going. My truck was purchased in Texas but my service dealership is Cal. Both my service dealer ship and my purchases dealership assure me there is not problem.
Sounds like there is a problem if you look on these boards. My purchase dealership told me the reason it happened the first time was because i faild to shut off and the turn the fuel cap three times when I replaced it and it sent a code. Lets let the schmucks at GM that say there is no problem load uo a load of their family and loved ones pulling a RV or horse trailer and then shut down to 20 mph on a freeway miles away from home. I sure they would think there is a problem. Dont think I am a GM hater this is my third scince 04 after I turned in 2 Ford 6.0 dogs. THe previous two were awesome.
Know way would I keep a truck that lays down four times.Thinking of lemon law at three.

2007 LMM , same problem , no K+N, all stock except ppe , power shuts down and reads reduced engine power
They,GM,have a real problem here.The dealers have openly admited they do not have the fix for this but there working on one.In the mean time we're out on the road wondering if you can get where your going and back.

I contacted K&N personally and talked to a woman named Arlene, she's in a division of the company that represents them legaly. She said if their filter was the direct cause of this problem, that they would pay the bill and prove GM wronge legaly. what do you think?

K&N told me that CNC made a MAF spray cleaner i could use, and yes it will cause it to go into limp mode.

I would say give it a shot...

They,GM,have a real problem here.The dealers have openly admited they do not have the fix for this but there working on one.In the mean time we're out on the road wondering if you can get where your going and back.


If it happens again (while they are trying to figure it out), I'd take your truck back to the dealer you bought it from and insist they give you something drivable until they figure it out. If they don't want to play ball, I'd press legal action and force them to do the right thing. Selling a truck that won't "get there and back" and expecting the customer to drive it like that is unacceptable. Especially after they've admited something is wrong but can't fix it.

If there’s one thing I’ve learned buying cars- it’s that having the right dealer that stands up and does the right thing for their customers makes all the difference. Crappy dealers need to be dealt with aggressively and with legal force if needed. Too many consumers lay back and take bad customer service and as a result, there are tons of bad dealerships in operation.

Now all that’s much easier said than done but I’ve been there, done that several times with Ford so I feel your pain!

Sorry to hear about your problems with the new truck....God I love my LBZ, glad I bought it when I did.;)

Just out of curiosity, is your truck black and lifted? I work at that dealer. I never touched your truck, from what I understand it's a "GM issue" and the manager is dealing with it. If I am not mistaken, I also saw a turbo back straightpipe on that truck (!). I could have most likely got it running with EFILive, but better not to get involved. Anyway, I wish some of you guys would take it easy on GM. They are not "shmucks or jerks" they are just trying to play along with the extremely strict new regulations the treehugging queers in the goverment put on new diesels, and still put out an outstanding product (which they do). If that's your truck, I love it, I want it so bad!

If it happens again (while they are trying to figure it out), I'd take your truck back to the dealer you bought it from and insist they give you something drivable until they figure it out. If they don't want to play ball, I'd press legal action and force them to do the right thing. Selling a truck that won't "get there and back" and expecting the customer to drive it like that is unacceptable. Especially after they've admited something is wrong but can't fix it.

If there’s one thing I’ve learned buying cars- it’s that having the right dealer that stands up and does the right thing for their customers makes all the difference. Crappy dealers need to be dealt with aggressively and with legal force if needed. Too many consumers lay back and take bad customer service and as a result, there are tons of bad dealerships in operation.

Now all that’s much easier said than done but I’ve been there, done that several times with Ford so I feel your pain!
Several years ago bought two new Ford F350s,first 6.0s.Could not keep these trucks out of the shop.Third time back with same problem,both trucks,service manager said we will buy back these trucks.I was floored.He stated they do not have a fix right now,it was up to me.I said buy,m.Factory rep called within the hour,wanted to know if I had any extra aftermarket stuff on truck.I produced all recepts floormats,bedliner,brushguard,even the camper top.They paid for all of it.No legel help needed.17 straght years of Ford trucks.Went to the chevy dealer bought my first duramax.Been ther ever since,and know this.

Several years ago bought two new Ford F350s,first 6.0s.Could not keep these trucks out of the shop.Third time back with same problem,both trucks,service manager said we will buy back these trucks.I was floored.He stated they do not have a fix right now,it was up to me.I said buy,m.Factory rep called within the hour,wanted to know if I had any extra aftermarket stuff on truck.I produced all recepts floormats,bedliner,brushguard,even the camper top.They paid for all of it.No legel help needed.17 straght years of Ford trucks.Went to the chevy dealer bought my first duramax.Been ther ever since,and know this.

Good deal- you're an old pro then! :D
I just hate seeing guys in bad situations with their truck not getting the right support and help from their dealer. Sounds like Ford treated you ok- those early 6.0's were nothing but trouble and they knew it. My 06 PSD was in the shop multiple times but with different problems. I got out of it and into this Duramax the first chance I got!

Hey Jim,

I too owned a 6.0 powerjoke. Did you sell yours outright or trade it in? I spoke with NUMEROUS dealers and they wanted to bunghole rape me on trade in.

The first words out of their mouths when I told them that I had an '04 F250 diesel was "is it a 7.3 or 6.0?". When I told them a 6.0, they had that facial expression that looked as if they walked into a restroom after someone had stunk it up.

I finally sold it outright to someone and didn't take too bad of a beating on it.

I've owned a 6.0 PSD, a 5.9 CTD, and now the 6.6 LMM DMax and I wished I had purchased a Chevy right off the bat because this is the best truck I've EVER owned. I can't keep the grin off my face while driving.

Not to get too far off topic here but I traded it. Dealer gave me excellent book value on it so I took it. It was only a year old so it was in great shape. I just wish I would have gone straight to the Duramax in the first place! All trucks have their problems but those certainly had more than their fair share.

Man I drove my truck around the keys a few days just to gain a little confedence.Just did'nt work,every time it even felt like it was going to hic-up I thought here we go again.No codes so far,only put 100 or so miles on.Just could not take a chance,I travel at night and pulling a trailer and tractor,just din't do it.Left the chevy in the keys for know,hooked up the Freightliner Sportschassie and came home.Have to go to work for a week or two up here,and take some heat for the lose of time.Not to sure about duramax right now.

I feel for you this is a low fuel problem still trying to find it fuel level falls below fuel sencer pressure gauge and jumps to limp, dont quiet know the cause but for temp repair shut of truck release remaining pressure threw fuel steem ( looks like a tire valve steem) then pump the fuel filter primer button --WHILE THE TRUCK IS OFF- this should get you going again

Just waiting on the dealer now.Went through customer service serveral times now.Truck still in the Keys waiting to see what there going to do.Told me they would call tuesday with some offer. In the mean time I will have to drive the Freightliner,not a good around the town truck.

whoever had problems with their K&N filters musted have their filters drenched in oil. A little goes a long way here. I've had their filters on every vehicle that i've owned and never had a hiccup once....


Never had a problem either, but I dont use K&N anymoreeither. There ae better filters out there, non-oiled. Why take the chance?

GM said they would call tuesday,never heard from them.Waited till 4:00PM wed.then started calling people,the dealer,customer service,Heard Chev.Service in Buford,Ga.and Blake Chev.in Homestead,Fl.Got several calls yesterday.A tad heated exchanges!They have disided to haul the ole beast one more time from the Keys to Blake Chev.This is unbelievable,I'm in Ga.with no truck,no car or truck to drive why are these people draging there feet on this.Got much better treatment from Fords.What concerns me about all of this is I have delt with Heard Chevrolet when it was Gary Brown Chevrolet,and Jerry Brown Chevrolet before that.The Gen.Mang. there is Nelson Neal who I have delt with for some 20 years.He says its up to GM,they have done everything for a buy back at the dealer.Is GM in that kind of trouble where thay can't take care of somthing they openly admit they do not have a fix for?I purchase 5 to 10 autos a year,what about the person who buys 1 every 3 to 5 years?Would they treat you any better?Well I'll wait till Wed.for customer service to call for another plan.

just clean the maf with carb cleaner and don't over oil the air filter

tell us what year and what mods you've done ,is is stock or does it have a straight pipe exhaust on it and did you mess with the dpf system?

First time,!00%stock Second time K&N filter,4"Cat back tailpipe.Third time stock filter 4"Cat back tailpipe.Fourth time 100%stock.Never got a chance to do a performance tune.

tell us what year and what mods you've done ,is is stock or does it have a straight pipe exhaust on it and did you mess with the dpf system?
07.5 2500HD crew cab longbed Black LMM

just carry a can of carb cleaner,a screw driver and some paper towels, if it happens again just r and r the maf ,clean it and try that ,,shouldn't take you 10-15 mins,,and remember to blot out the k&n filter so no extra oil gets on the maf,,but if gm still uses the same round air filter as the 06'-07' classic,the factory air filter used flows as good or better as the aftermarket one,,if you disabled the dpf the truck could think somethings wrong,for now just leave it stock,,

Just out of curiosity, is your truck black and lifted? I work at that dealer. I never touched your truck, from what I understand it's a "GM issue" and the manager is dealing with it. If I am not mistaken, I also saw a turbo back straightpipe on that truck (!). I could have most likely got it running with EFILive, but better not to get involved. Anyway, I wish some of you guys would take it easy on GM. They are not "shmucks or jerks" they are just trying to play along with the extremely strict new regulations the treehugging queers in the goverment put on new diesels, and still put out an outstanding product (which they do). If that's your truck, I love it, I want it so bad!
I wished I had met you.I loved the truck from the start but then all of this.Your right this is a GM issue,your dealer or my dealer in Ga.have not draged there feet on this matter.Its customer service,they talk to you like your some sort of nitwit. All they do is talk and buy more time.In the mean time I'm without a truck.At the dealer in Ga. I would get a loner no questions asked,but Blake has a policy that thy have to look at the truck first to justify a loner.The problem there is it takes five days to look at it. Then they call say its fixed and its coverd.Your service manager Tony is great but he can only do so much.Blake's policy on loners sucks.And its not like I'm just an out of towner here,I work in the Keys a lot.I have bought an S10 and an SSR from Blake and ordering new ZO6.All in the past two years.Hope to meet you sometime,are you a tech there?

I tried a K&N on my '04 LB7. I didn't notice a damn thing with it. No more power, no better fuel mileage, nada...
IMO, all the hassle with the thing, just toss it and run the stocker.

just carry a can of carb cleaner,a screw driver and some paper towels, if it happens again just r and r the maf ,clean it and try that ,,shouldn't take you 10-15 mins,,and remember to blot out the k&n filter so no extra oil gets on the maf,,but if gm still uses the same round air filter as the 06'-07' classic,the factory air filter used flows as good or better as the aftermarket one,,if you disabled the dpf the truck could think somethings wrong,for now just leave it stock,,
Stock it is, stock it will stay.If I keep it I'll have carb cleaner&paper towels with me thanks.

Yes I am a tech. I always tease Tony about your truck, that I could fix it with EFILive. They get pissed, of course we are very professional and don't mess around. Once again, everyone drools over your truck, we all like it very much. I thought it had straight exhaust from the turbo back, I'll look at it in a few hours. Anyways from what I see so far you have big rims, big lift, intake and exhaust. While the mods are nice and tasteful, those kind of things can cause problems on the LMM from what I hear and learn on here.
If you ever want to talk to me just ask for "Boost" next time you're at the dealer. I hope this works out for you.

Yes I am a tech. I always tease Tony about your truck, that I could fix it with EFILive. They get pissed, of course we are very professional and don't mess around. Once again, everyone drools over your truck, we all like it very much. I thought it had straight exhaust from the turbo back, I'll look at it in a few hours. Anyways from what I see so far you have big rims, big lift, intake and exhaust. While the mods are nice and tasteful, those kind of things can cause problems on the LMM from what I hear and learn on here.
If you ever want to talk to me just ask for "Boost" next time you're at the dealer. I hope this works out for you.
Hey Boost got a fealing we're going to meet. The truck was towed to your dealer for the third time.Towed in 10-12 today is 10-18 have not heard a word from Tony.I think this truck has them stumped.Customer service has bean nothing but a joke.Hate to say this but I'm canceling orders on two trucks and Z06 today.I can't beleve I'm looking at Dodges.As for the mods on this truck,they were very simple,tailpipe,K&N air filter.I worked for GM for years in Mich.as a tech,met my wife of thirty years there.Had my own shop in Romeo,Mich.Still there today.I do all my own mant.on my cars & trucks.Whenever I replaced the air filters I used K&N.First time I have ever had anyone tell me my problem was the filter.The fact is the truck is all stock,filter,tailpipe and is still doing the same thing.This truck started to do this ,shuting down, at 300mi. totel stock.First time in Ga.Three times in Fl. I'm up in Ga. working on lake lanier,I'm in the marine cont. now for past 28 years,Wahoo Docks, check us out on line.Need to get back to Fl. job. Not having this truck to work with has bean a real loss.I geting legel people involved but at this point it seems the thing to do.I call Tony today and my dealer up here to let them know what actions will be taken on this matter from here on out.What a shame.

I can't believe these dealers can get away with not giving out loaners. I would call your area's GM rep about that.

Here is some text straight from Chevy's website:


What about Courtesy Transportation?
Courtesy Transportation is also included for 5 years/100,000 miles (whichever comes first) on all 2007 passenger cars and light-duty trucks. Whenever warranty repairs are required, several transportation options and/or reimbursement of certain transportation expenses are available for your convenience at participating dealer/retailers.

I guess they can probably screw you because of the "participating dealer" part at the end.

I have never had an issue getting a loaner from either of the dealerships I have gone to. Doesn't matter if its for 1 hour or 1 week, they hand me the keys to a car.


Good luck with your troubles. Hope you get straightened out soon!

I can't believe these dealers can get away with not giving out loaners. I would call your area's GM rep about that.

Here is some text straight from Chevy's website:



I guess they can probably screw you because of the "participating dealer" part at the end.

I have never had an issue getting a loaner from either of the dealerships I have gone to. Doesn't matter if its for 1 hour or 1 week, they hand me the keys to a car.


Good luck with your troubles. Hope you get straightened out soon!
Maybe it's the "light duty truck" language that they are using as an excuse.

I guess every dealer can make ther own rules. At Blake Chev.Cad. in Homestead Fl. they we need to look at your truck or car first to determin if you get the loner or not. What a crock. Then 5 days later "hey come and get your truck its fixed and buy the way its on us" Thanks can somone come and get me? No! Man I can not believe the way this is going down. Going on 30 days in the shop. Called the general manager of heard chevrolet this morning to tell him to cancel all orders on new Service body,DuellyCC,andZ06. I told him he was great to deal with but this dealings with customer service should go down in the history books.God here we go legel action against GM.Who wins here? I stop driving trucks & cars I love. And GM loses just another customer. Just hope I fit in a viper.Drove two Dodges yesterday,not bad not bad at all.

I feel your pain. I also have a truck that throws codes for no darn reason. 3 MAP sensors later 2 MAFS later still the same crap! Boy I am really kicking myself for the LMM purchase. Hell the LBZ was bullet proof.

Very sad to hear all this. While I am just a dirty nobody tech that doesn't make the rules, I know that they tried hard to resolve the situation. Every time that thing was there, there was a manager in it with a Tech2 almost all day. The rest of the time probably on the phone with GM. Times are hard these days for everyone everywhere, and I don't know who makes the rules on loaners but they certainly don't "hand you keys" for anything, I suppose a regular warranty repair or a safety issue should definitely get one.

On the other hand, I must mention that the only LMMs that we had EVER had problems with were modified in one way or another. We deal with countless trucks daily, and I stand by my belief that it's an excellent product. I am very proud to drive and work on GM trucks! (even though GM doesn't give a rat's ass about me or if I eat this week :()

I really hope that this works out for you. Sucks that you're looking at Dodges, but at least stay away from the imports :). I know where the quality and power is and I'll stay there. The more this turns into an anti-GM legal thing, the less I think I should get involved. I always like to help (and show off that I can LOL), but now "greater powers are in motion".

Good luck man and sorry about the bad experience. It's one in a million but unfortunate that it happened to you. The truck still kicks ass, wanna sell it? Just joking I am broke but I would buy it in a heartbeat!

I feel your pain. I also have a truck that throws codes for no darn reason. 3 MAP sensors later 2 MAFS later still the same crap! Boy I am really kicking myself for the LMM purchase. Hell the LBZ was bullet proof.
Had a LBZ Duelly CC myself.Pulled 16000lbs everywhere.Pumped up 150hp never missed a beat.I could not beleve how that truck would pull.Coming down an on ramp push the pedel down and you would think it was going to pull the hitch off.The only problem was stoping with the load.Never left the yard unless trailer brakes were 100%.I would allways check the pads even pulling that kind of load and 75000 miles on the truck still 50% there.I would take that truck over the mountains in north Ga.up Hwy 60 or N.Hwy129 pull that shifter to lower gear coming of the hill and watch it rev like hell never a hikup.So why the hell would I buy anything else?Costomer service ,If you can't get service or have a corp. like GM step up to the plate and suck it up then I will be dambed if I'm going to drive anything with there name on it.Just the way I feel right now.

I can't believe these dealers can get away with not giving out loaners. I would call your area's GM rep about that.

Here is some text straight from Chevy's website:



I guess they can probably screw you because of the "participating dealer" part at the end.

I have never had an issue getting a loaner from either of the dealerships I have gone to. Doesn't matter if its for 1 hour or 1 week, they hand me the keys to a car.


Good luck with your troubles. Hope you get straightened out soon!
If this truck was at my dealer in Ga. I would be driving a 2500HD till mine was fixed.These people are the best when it comes to taking care of me and my family.All dealers are different and have different policies.

The folks at Gale Banks addressed this issue, since they have now come out with their new Ram Air intake/filter kit............They advised me that some other manufacturers are not placing the MAF sensor in the correct position after modifying the intake. The new added amount of airflow that the new system draws in causes the MAF to mess up. The Banks sytem repositions the sensor where this problem does not occur.

Went to the dealer here in Ga. yesterday"Bill Heard Chevrolet"to talk with Nelson Neal Gen. Mang. He even said he could not get costumer service to call him back.He's been trying to arrange conference calls between him,his service manager,and Tony at Blakes with no success.We went in to his office he sat down made several phone calls left messages with ever one.He said its like this every time no ones home.Man I hope nun of you have to deal with GM costumer service.

Very sad to hear all this. While I am just a dirty nobody tech that doesn't make the rules, I know that they tried hard to resolve the situation. Every time that thing was there, there was a manager in it with a Tech2 almost all day. The rest of the time probably on the phone with GM. Times are hard these days for everyone everywhere, and I don't know who makes the rules on loaners but they certainly don't "hand you keys" for anything, I suppose a regular warranty repair or a safety issue should definitely get one.

On the other hand, I must mention that the only LMMs that we had EVER had problems with were modified in one way or another. We deal with countless trucks daily, and I stand by my belief that it's an excellent product. I am very proud to drive and work on GM trucks! (even though GM doesn't give a rat's ass about me or if I eat this week :()

I really hope that this works out for you. Sucks that you're looking at Dodges, but at least stay away from the imports :). I know where the quality and power is and I'll stay there. The more this turns into an anti-GM legal thing, the less I think I should get involved. I always like to help (and show off that I can LOL), but now "greater powers are in motion".

Good luck man and sorry about the bad experience. It's one in a million but unfortunate that it happened to you. The truck still kicks ass, wanna sell it? Just joking I am broke but I would buy it in a heartbeat!
I'll tell you one thing if by some ungodly reason I end up with this truck back I,ll jerk everything off this truck,build the shit out of it and blow it up and have fun doing it!

You have never said what codes it threw when you limped-do you know what the code are??? Please post-it will either be a connector issue or possible turbo vanes sticking. When was the truck built??

po299

You have never said what codes it threw when you limped-do you know what the code are??? Please post-it will either be a connector issue or possible turbo vanes sticking. When was the truck built??
I'll get that info posted as soon as I get back to Fl. In Ga. working right now. Its a PO code to do with intake every time.

The folks at Gale Banks addressed this issue, since they have now come out with their new Ram Air intake/filter kit............They advised me that some other manufacturers are not placing the MAF sensor in the correct position after modifying the intake. The new added amount of airflow that the new system draws in causes the MAF to mess up. The Banks sytem repositions the sensor where this problem does not occur.
All stock Bartman and still thowing codes.

4rotorCorvette, going to look you up next week when I get back to Fl. Talked to Tony yesterday, He said he is still working on it? Nine days,any info would be great.

2459 and 0402. Also, from what I heard the truck did not throw any codes at all when it was driven last time with a stock intake and exhaust, but you were worried about driving it so you dropped it back off. Is that right? If they are making some progress that's great news. Good luck with everything.

2459 and 0402. Also, from what I heard the truck did not throw any codes at all when it was driven last time with a stock intake and exhaust, but you were worried about driving it so you dropped it back off. Is that right? If they are making some progress that's great news. Good luck with everything.
Thats not true! Picked it up from Blake's drove approximately 150 miles.Toped it off with fuel hooked up trailer with load drove 2 or 3 miles backed it into the yard and was ready to leave. Got in it in the morning, 1:00 AM drove 12 miles, Card Sound Rd, engine light came on lost power, would only idle.Called my son, had him bring the Freightliner,swapped trucks, then disconnected positive cable on the 2500 for about 45min. Hooked it back up and no eng. light. Al drove it home fine, followed him back to the house to make sher he had no problems,17yr. old 3:00 AM Got my ass back on the road and back to Ga. Called customer service, not Tony,the next day. Customer service are the ones that drug this out for a week before "THEY" had it "TOWED" to Blake's. Not just dropped off because I was worried about driving it. Thats why I am so pissed about this.I should have been up here on this job a month before I was. Just because of this truck I've got so far behind. I'm sure anyone that works by the contract with time constraints would understand. I hope that Tony has his story straight on this truck. Thanks

I did not hear that from Tony. I don't speak much to him about your truck, he prefers that I don't get involved. This case really has me (and a lot of other folks) scratching my head. If the truck was completely stock, I would say you got a lemon, but right now I hope it's because no one has figured out how to adjust for all the mods. I think the LMM is a great platform and if I could afford to I would have one just like yours. By process of elimination, and logic (if there is such a thing) I would say maybe the wheels are causing the problem. That is IF the truck repeatedly sets codes with the stock intake and exhaust. What size are they? They look like at least 22s. I don't think the big lift could do anything except maybe cause a vibration if the driveline angle is excessive. I'll just stand by and watch this one play out from the sidelines, curious to see what is causing the problems. As a future LMM owner (and NOTHING I drive stays stock long), I am sure we can all learn from this. Plus I'll have to work on and tune a crapload of them soon, I've already had to turn away three '08s before I upgraded my EFILive.
Take care.

Drive train stock,lift is by Fab Teck,triple shocks by Pro Comp,wheels 22x12's Western Stars W/Toyo shoes. Please don't tell me this maybe the problem? My motto is modify,modify,modify. If you don't how will they ever know its you?

Agreed. And I am positive that there is a way to modify all you want. The only thing is on these new "wonders of technology" (and that includes all makes), there is an unbelieveable amount of emissions and mileage related electronics that are all required by the government and make the average vehicle owner and technician / dealership's life a nightmare.

Are These Stock Height Tires?,can't This Throw Off The Ecu And Bcm ,thus Setting Codes Even Theres Nothing Wrong

DID you say it had the P0402 CODE in it the computer it seems like to me that the truck keeps trying to regen or is regening to much and it is limping the truck. big tires plus towing = more soot pluged dpf sooner i think ehter your dpf is bad or a dpf related sensor is bad limping the truck and causing your issues jmo thoe

Are These Stock Height Tires?,can't This Throw Off The Ecu And Bcm ,thus Setting Codes Even Theres Nothing Wrong
I'm sure the tires are over size, don't know what size they are right now haven't seen the truck in so long. But I want to say this, the truck was modified at a dealer approved shop. Heard Chevrolet ,have these trucks in this modified form sitting all across the front of there lot. 1500's,2500's,Blazers,Suburbans,Trailblazers,and Avalanches. This is why I was so desperate to get it back to this dealer.They are very used to working on these trucks. The service Mang. at Heard's only concern was that I used an after market programmer. This truck has never been reprogrammed buy anyone but the dealer. Customer service has brought up these mods on the truck several times,but Heard Chev said they have sold 100's of these trucks with same mods as mine with no problem. I do believe Blake's are the ones bringing all the concerns about the mods to the table. Maybe we need to just get it towed to the original dealer 800mi. down the road.

Maybe we need to just get it towed to the original dealer 800mi. down the road.

Yah' thunk !? Tow it already to the selling dealer.....


:cool::cool:
:cool::cool:
:cool::cool:

DID you say it had the P0402 CODE in it the computer it seems like to me that the truck keeps trying to regen or is regening to much and it is limping the truck. big tires plus towing = more soot pluged dpf sooner i think ehter your dpf is bad or a dpf related sensor is bad limping the truck and causing your issues jmo thoe
Code PO101 I believe is the one that keeps coming up.

Yah' thunk !? Tow it already to the selling dealer.....


:cool::cool:
:cool::cool:
:cool::cool:
Sure easier said than done.Who pays? thats has been the thing Heard has been trying to get done. They want GM to authorize the haul but they won't so far. Should I have the burden of expense? I sure in the hell don't think so. Think of the amount of money that this ordeal has cost me already, not to mention the grief.

Just posting update on my truck. Going to the dealer today, Blake's, to pick it up. Going to just park it at the house at the Keys till I hear from the attorneys on this. The truck has been at Blake's for about thirty days now. Tony said they have put about 100 miles on the truck with no problems. I got to tell you guys beware of this limp mode, you do not know when it will happen! I believe GM has taken the control out of the hands of the consumer and given it to a computer. they do not trust us with the ability to make decision our own. If anything goes wrong with these emissions on these trucks that is going to cost GM money, then the computer is going to make you take it to the nearest dealer, not you. The light does not come on and say,service immediately. It will shut down on you, maybe when your passing, or how about when your pulling into traffic. Pulling a load, maybe your travel trailer with your kids on board. these trucks with a heavy load on them will not pull when they go into limp mode. I am so concerned about this that I believe that it is just a matter of time that someone is going to get seriously hurt or even killed in one of these trucks. And the cause will be directly associated with this limp mode. There has to a better way than this. You have to be able to drive these trucks in stock form and be able to trust you will be able to make it to the next town. Or how about giving me the choice of when and where I feel is a safe place to pull over. Note this computer program that GM has decided to use on these trucks have taken that decision away from the consumer. This is a money issue, if they let us decide when and when we can stop, pull over, get to the nearest dealer it might cost them money, because we're to damn stupid to think on our own.

So how many trucks besides yours are having this crazy problem?

Been watching your post. Noticed the Limp Mode that mine is doing. Now I see you are getting P0101. That is what code my truck is throwing. GM has a service update that is supposed to fix it. Still waiting for them to fix my truck and see if it works. I had the Edge Attitude with Juice installed. Had been receiving that Error Code several times would always clear them out and truck would keep running(CEO of Edge confirmed and stated they had a fix for it, he posted it on this website). Then finally on the way home unloaded from a long trip it Limped on me. Would not clear. I took off the Edge because of this code and another code(can't remember it) sent it back because Edge has been having a problem also(could actually be GM's). I will tell you what worked for me(Edge of Friday Dropped off at dealer Monday) I used a Code reader I bough from Walmart a couple of years ago, after truck warmed up I would not get codes again until I let it cool down or overnight. I went out Sunday and same thing again. Again waited for the motor to warm up and clear the code and it run fine, but that ain't what it supposed to do. When I spend that kind of money on a Truck/Product I expect it to be toublefree. Also just for info of other post like from Boost, I bought my truckfrom the Dealer with the American Luxury Coach package, Lift, big tires,etc..........has me wondering on the mod thing too. 2500 miles on it and in the shop. Pass along any info.

So how many trucks besides yours are having this crazy problem?
Boost, stopped by the dealer today to pick up the truck and looked all over for you. Had them calling for you on the loud speaker. Anyway didn't get to meet you yet thought it would be the last time I would be in the dealer. Then I met Craig Pearce, he said he wanted to give it another week to see if he could find the problem. Said he wanted to hook up some weight to the truck to see if it would do the limp thing with him. Seeing I was towing with the truck the last three times it went into limp mode. I value your opinion because you like me are in the fix it part of the dealer. I have to let them try to fix this thing with out the help of after market programing. From ever thing I have read I could just take the ball and say f--k you guys and I'll fix this on my own. This truck truly has a problem and I think it is in the Computer. My biggest beef is these trucks will shut down on anyone at anytime without notice. It does not matter if they have 100 miles on them or 100000 miles on them. The frickin truck has a mind of its own and me for one wants to be the one in control. Man I'm sorry but at this point I get thinking about this and I start rambling on. Oh yeah how many, Too many. Its just you do not know when.

Been watching your post. Noticed the Limp Mode that mine is doing. Now I see you are getting P0101. That is what code my truck is throwing. GM has a service update that is supposed to fix it. Still waiting for them to fix my truck and see if it works. I had the Edge Attitude with Juice installed. Had been receiving that Error Code several times would always clear them out and truck would keep running(CEO of Edge confirmed and stated they had a fix for it, he posted it on this website). Then finally on the way home unloaded from a long trip it Limped on me. Would not clear. I took off the Edge because of this code and another code(can't remember it) sent it back because Edge has been having a problem also(could actually be GM's). I will tell you what worked for me(Edge of Friday Dropped off at dealer Monday) I used a Code reader I bough from Walmart a couple of years ago, after truck warmed up I would not get codes again until I let it cool down or overnight. I went out Sunday and same thing again. Again waited for the motor to warm up and clear the code and it run fine, but that ain't what it supposed to do. When I spend that kind of money on a Truck/Product I expect it to be toublefree. Also just for info of other post like from Boost, I bought my truckfrom the Dealer with the American Luxury Coach package, Lift, big tires,etc..........has me wondering on the mod thing too. 2500 miles on it and in the shop. Pass along any info.
I have no mods on the engine, nothing. The mods on this truck have been, like yours it sounds like, done by an approved facility by the dealer. Thats why I love when they say, it maybe the mods causing this. Thats the latest thing that customer service has been clinging to. Right.

Just a quick post, picked the truck up yesterday. Drove it to the house in the Fl. Keys, where I parked it to await pending legal actions. Love that truck.

I guess you got more patients than myself. love the truck or not

I guess you got more patients than myself. love the truck or not
Hows the weather up there? No more patients with this one. The only reason this has gone on this long is because of the relationship I have with the dealer where I bought the truck from. This one has really put some friendships to the test.

This problem is a lot more wide spread than I even thought it was. GM is getting hurt on this one. Looking more like the 6.0 stroker buy back everyday. I love it when you got one dealer telling you the truth and another saying to you " What problem?" Just got forms from attorney yesterday saying GM has requested all moneys payed out on the truck. Lean holder, add ons, and any other paper work I would like to include. Do not know what all this means but might be good. I'll post progress.

Any updates?

Just that my attorney called Friday 12/1/07 to request all the information that I wrote down during all the phone and personal conversations with dealers, and customer service. Twelve pages to be exact. My wife is typing them up right now. She said " I can hardly read some of this you must have been upset when writing" You think?

Keep going.....

well ive been using k&n cleaner on my afe filter. no mas

well ive been using k&n cleaner on my afe filter. no mas
Please elaborate.

Keep going.....
I just wanna come over and sleep in your garage.

whoever had problems with their K&N filters musted have their filters drenched in oil. A little goes a long way here. I've had their filters on every vehicle that i've owned and never had a hiccup once....

The trick is.........saturate them completely.....but they should sit in the sun and "drip dry" for a couple of hours before install. The filter oil will become tacky after a while. I prefer UNI oil, it doesn't run everywhere like the red crap does.

This problem is a lot more wide spread than I even thought it was. GM is getting hurt on this one. Looking more like the 6.0 stroker buy back everyday. I love it when you got one dealer telling you the truth and another saying to you " What problem?" Just got forms from attorney yesterday saying GM has requested all moneys payed out on the truck. Lean holder, add ons, and any other paper work I would like to include. Do not know what all this means but might be good. I'll post progress.

GM contacted us to make a line of Ram Air hoods that would solve a top tank heating problem they were trying to "keep quiet." The problem causes the top tank of the engine and some of the electronics in the engine compartment to get too hot and force the computer to go into limp mode. The way it was described to us, sounds exactly like what I'm reading in this thread: hot, pulling heavy loads, etc.

Well, the hoods are done and GM put them through the ringer of crash tests, water management tests, slam tests, and heat buildup tests. We were told that if a customer complained and requested one of these hoods it would be installed under warranty. I haven't seen them follow through though. Perhaps the lawyers have told them to remain silent. I guess owners shouldn't then.

GM contacted us to make a line of Ram Air hoods that would solve a top tank heating problem they were trying to "keep quiet." The problem causes the top tank of the engine and some of the electronics in the engine compartment to get too hot and force the computer to go into limp mode. The way it was described to us, sounds exactly like what I'm reading in this thread: hot, pulling heavy loads, etc.

Wow! Wouldn't that be something if it were heat related. Thought these things were tested in Death Valley at full load capactiy....

i dont really think its the ecm overheating. every the codes that most are throwing are dpf related . do u have any pics of thees hoods

i dont really think its the ecm overheating. every the codes that most are throwing are dpf related . do u have any pics of thees hoods

We've got a few on our web but as I have not yet become a sponsor, I cannot post. If any ambitious gear head / general member out there can find a web site (like mine) with pictures of my hoods. They could legally post a link. A very interesting site not belonging to me is Lokey Trucks. They took one of these hood down the Baja 1000 and back without any issues. They have a ton of videos about their whole adventure at

http://www.lokeytrucks.com/Baja.html

We've got a few on our web but as I have not yet become a sponsor, I cannot post. If any ambitious gear head / general member out there can find a web site (like mine) with pictures of my hoods. They could legally post a link. A very interesting site not belonging to me is Lokey Trucks. They took one of these hood down the Baja 1000 and back without any issues. They have a ton of videos about their whole adventure at

http://www.lokeytrucks.com/Baja.html
Love the pics.

So did the truck get bought back by GM?

I guess you got more patients than myself. love the truck or not

Hows the weather up there? No more patients with this one. The only reason this has gone on this long is because of the relationship I have with the dealer where I bought the truck from. This one has really put some friendships to the test.

Are you guys doctors?? ):h

Can I get one of the special hoods that keep the modded LMM out of limp mode?? :bounce:
Ooh pweease...

:confuzeld

Can I get one of the special hoods that keep the modded LMM out of limp mode?? :bounce:
Ooh pweease...

Your local GM dealer is supposed to know about them but the media hype from GM was limited to a small paragraph at the bottom of one of their Dealer Network Newsbrief. Your local speed shop can most likely get them through their usual parts distributors. If that doesn't work go to our web or call the factory. I'll be a sponsor as soon and can post the details but for now you'll need to google us.

Your local GM dealer is supposed to know about them but the media hype from GM was limited to a small paragraph at the bottom of one of their Dealer Network Newsbrief. Your local speed shop can most likely get them through their usual parts distributors. If that doesn't work go to our web or call the factory. I'll be a sponsor as soon and can post the details but for now you'll need to google us.

Do you have any info on the bulletin or document #? That way I can access it and post it here. The hoods will get much more exposure if we can link a GM document that acknowledges them. So far I haven't heard anything besides keep the hood open for "Service Regeneration"? Thanks.

I have not been following this much but did read the post tonight as a friend is thinking of getting a new LMM. I suppose this is only LMM's. I'm glad I went with the LBZ 15,000 miles no problems at all. Should anyone thinking of getting the LMM hold off for awhile?

Are you guys doctors?? ):h
Ahh why yes,yes I am, Let me get my rubber glove. Kind of the way I feel when I talk to customer service.

So did the truck get bought back by GM?
Nope, just sittin in the yard waiting for the latest attorney invoice.

I have not been following this much but did read the post tonight as a friend is thinking of getting a new LMM. I suppose this is only LMM's. I'm glad I went with the LBZ 15,000 miles no problems at all. Should anyone thinking of getting the LMM hold off for awhile?

I issue GM approached us (Suncoast Automotive Performance) about was affecting their 03 to 05 Duramax. They enlarged the radiator on the 06 to try to help and then changed the model in mid 07.

Hey AlZ do you have an update for this thread?

As for the mods on this truck,they were very simple,tailpipe,K&N air filter.I worked for GM for years in Mich.as a tech,met my wife of thirty years there.Had my own shop in Romeo,Mich.Still there today.I do all my own mant.on my cars & trucks.

Where at in Romeo? I work in Romeo at TRW.

Do the problems I am reading here about LMM engines apply to the C4500 and C5500 Trucks? Also,are 2008 model years having the same problems?

I would not worry, most of those trucks are just fine. These problems are rare, however unfortunate for the owner. The LMM is the best engine out IMO, especially when "slightly modified".

Hey AlZ do you have an update for this thread?
Paper work paper work. I have taken a different approach to this problem because of my hate for the limp mode. First things first. I'm going through all the motions, that I am being guided to do, in order to have this finally end up on the shoulders of the Motor Vehicle Safety Division. Just yesterday I had the truck at Blake Chevrolet for it's finale check up. Just signed all papers to go into arbitration with G.M. The truck sits in Fl. as I work in Ga. one truck short. One thing I would like to make very clear is that Blake Chevrolet in Homestead Fla. has bean very helpful in this matter. Both Craig and Tony there have been great to work with after they understood that the truck was not just going to go away.

Where at in Romeo? I work in Romeo at TRW.
On the corner of 31 mile and VanDyke. 500 and some family members in Mich. Rabbits didn't have shit on us.

Do the problems I am reading here about LMM engines apply to the C4500 and C5500 Trucks? Also,are 2008 model years having the same problems?
Any 07.5 and 08 are equipped with the DPF and the infamous limp mode.

Paper work paper work. I have taken a different approach to this problem because of my hate for the limp mode.
Thanks for the update good luck and keep us posted.

I have an LBZ and have been having similar problems. I related mine to the extreme cold here in Minnesota never had the problem in the summer. If I replace the fuel filter it runs fine except this last time it only lasted less than a week before the code coming up again tonight. It was -13 tonight so i instantly thought of fuel geling, But now that i read this, 3 filters ago right before winter here I cleaned my volant filter and re oiled it, and none of those filters have made it below 80% before messing up again. Never thought about air problems I will have to clean my sensor to and see if that makes a differance.

carry a dtc code reader with you like I do

carry a dtc code reader with you like I do
x2, gives you and excuse to buy a ppe

I have an LBZ and have been having similar problems. I related mine to the extreme cold here in Minnesota never had the problem in the summer. If I replace the fuel filter it runs fine except this last time it only lasted less than a week before the code coming up again tonight. It was -13 tonight so i instantly thought of fuel geling, But now that i read this, 3 filters ago right before winter here I cleaned my volant filter and re oiled it, and none of those filters have made it below 80% before messing up again. Never thought about air problems I will have to clean my sensor to and see if that makes a differance.
Absolutely, any moisture or oil in the intake tube could be the culprit.

big dd, put your stock air filter back on ,they flow more air as any aftermarket air filter

Got an interesting call yesterday from a good friend at Bill Heard Chevrolet. He asked me how the truck deal went down. I told him the truck was still sitting in Fl. and that we now where waiting on the BBB to make the next step. Said he could not believe this had not been taken care of. Asked if I could get the truck to Ga. to his shop? Asked what kind of truck I Would swap for. I told him I could use a 4X4 Dually. He called right back with info on black 3500 4X4 DRW LTZ. I said, so how much is this going to cost me? Told me to come and get the truck and he would handle the paper work. I'm going to call him back on Monday just to make sure we are on the same page.

I'd be pi$$ed to have my new Dmax sitting in some lawyer's in-box.
Hope it works out -- good luck!

So let us know what you're going to do................

I have the 06 LBZ and have 375,000 miles on it. I tow RV cross country for a living. I have had a limp problem since about 180,000 miles. I notice it only limps when the outdoor temp is above 65 degrees farenhiet, towing a trailer and all my operating temps reach normal. I am able to reset out of limp mode by pulling over and shutting off the truck for about 1 or 2 minutes then restarting. Problem will re-occur many times a day. Sometimes I will be towing at 70 mph and not even realize im in limp until i gouge on it to pass and it just falls flat on its face. My CEL is always on due to the K&N filter and the 4"down pipe back exhaust, so I cant tell Im in limp till I gouge on it. The Ram Air hood to cool things sounds good to me. I added a pipe throught the fender to blow cool air on the fuel filter area but no help. Runs fine all winter cuz temps never reach normal operating range, but summer is on the way. :mad: I just ordered EFI Live so maybe I can eliminate the codes that throw me into limp mode. AAnything to keep me going. I get a code for low fuel rail pressure, but several trips to dealers and a new fuel pressure regulator hasnt helped. Im desperate. Someone said maybe its the transmission temp sender thats bad. Maybe?
Anyways thats my story, any help would be appreciated. Including EFI live help to eliminate the codes to keep me from going into limp. I know Im treating the symptom and not curing the problem, but no one can tell me what the problem is so I will be satisfied with treating the symptom. Its extremely stressfull to tow to alaska in limp mode!! PLEASE! thats rediculous. I have to drive it to make a living, so I will do what I have to.

Thanks,
Joe

wash your maf,and try running the stock air filter assm

Any Updates?

Gag Order?

I cleaned the MAF, No help. I was having this problem before I put the K/N type filter on so thats not the prob, though I am going back to the stock box. Just went to Seattle the other day and went into limp mode for the first time this season. :( Its going to be a long summer. :(

So, what was the final outcome? Can you talk about it?

Sounds more like a MAF sensor problem due to oil residue buildup from the K&N filter. There has been allot of discussion on this site about the K&N problems. I had a K&N on my 99' Dodge 1500 gaser and had to remove it because of the same problem. Once I returned to the standard filter never had another problem.

Clean off the MAF wires with a contact cleaner/degreaser spray and junk the oiled filter!

Geez i have a K & N on my 98 Z28 Camaro never had any problems but got me wondering if i should ditch it, that Zeddys like new but without warranty lol hmmm :confused:

Wow what an adventure. Had to tow the 2500 to Buford Ga. to make this all happen. As you know my business is based in Ga. So having the offer from my dealer in Buford, Bill Heard Chevrolet, I had to get the truck to them to make the deal work. This was not a buy back but an offer from a friend, Nielson Neal, the general manager of the dealer. I had to go back to Ga. on business so I towed the 2500 behind the Freightliner and dropped it off at the dealer. Looked at the 3500 that was to be the replacement truck. Nice truck, LTZ 55,275.00 MSRP. I was in Ga. for ten days and two days before I left Nielson said the deal was done to come get the truck. With no questions asked I picked up the 3500, got a check from GM for 5000.00 and a payment of 350.00 less a month. I have lots of questions but will let the smoke clear before asking what just went down? I'm just happy that this part of this ordeal is over.

Did Heard Chevy swap over all your mods & upgrades to the new one??

So did they swap even up or how did it work as far as price? How long did you have yours for?

Did Heard Chevy swap over all your mods & upgrades to the new one??
Negative, It was my choice to move up to the 3500 over the 2500. The trucks MSRP was about 1000.00+ over the 2500's. 07.5 vs 08 also. It was a swap that I feel good about. The 2500 had 12000 miles on it. As for the money it's a wash. As for aggravation who knows?

congrats on staying with gm on this one. Not sure what I would have done.

Negative, It was my choice to move up to the 3500 over the 2500. The trucks MSRP was about 1000.00+ over the 2500's. 07.5 vs 08 also. It was a swap that I feel good about. The 2500 had 12000 miles on it. As for the money it's a wash. As for aggravation who knows?

So then...........I guess I won the bet. How long until I get my beer?

congrats on staying with gm on this one.

I have to agree! It's always nice to establish a relationship with a great dealership. You might pay a little more every so often, but in the long run it's worth every penny....

So then...........I guess I won the bet. How long until I get my beer?
Some how I was thinking that you owed me a six pack way back when. Then I was figuring that interest was accruing to the tune of a twelve pack. Now I'm facing that pain staking break in period. After all that driving I sure could use a cold one. Good to hear from you.

congrats on staying with gm on this one. Not sure what I would have done.
I looked so hard at the other two guys. Lets face it the Duramax is the best thing going. I'm talking total package. I had this thing that I was going to do a Ford or Dodge, man all you have to do is drive em, not for me. I would rather drive my Freightliner full time.

Some how I was thinking that you owed me a six pack way back when. Then I was figuring that interest was accruing to the tune of a twelve pack. Now I'm facing that pain staking break in period. After all that driving I sure could use a cold one. Good to hear from you.

Seems to me..........you had to send yours back.......therefore mine lasted longer;-)

A cold one is good anytime, not just during the grueling break in period. I'm looking forward to my 12 pack.

Seems to me..........you had to send yours back.......therefore mine lasted longer;-)

A cold one is good anytime, not just during the grueling break in period. I'm looking forward to my 12 pack.
How about best two out of three?

How about best two out of three?

Ha!

First off I am new to DP but stright to business back in June of 07 I bought my first Duramax diesel I was excited being 20 and having my frist diesel. I had it for a couple weeks and my check engine light came on, and I started to get worried about this truck only being a couple weeks old and having problems already. I took the truck back to the dealership and they said it was the mass air flow sensor, so they didnt have any instock so they took one off of a brand new truck sitting on the dealer lot. I drove the truck around hundred miles and the light came on again and this time it felt like the truck has no power and is shutting down which sounds like "limp" mode. So i took it back to the dealership and they again put a new mass airflow sensor on. And i drove it for a couple weeks and it happend agained so i took the truck to the dealership again and said fix it, it was a saturday and the master tech wasnt at work so they couldn't do nothing to it. I am driving back home and my truck just seems like it is about to shut down no power going 30 mphs wouldn't shift nothing so i called the dealer ship and they told me to get it back. They gave me a car to drive and gas money and took them a week to fix it. I cant recall what the mechanic said it was but will find out and post it. If it hadnt gotten fixed that time the lawyer was about to step in, but it was fixed and hadnt had no problem out of it....The mods i had were 18" mkw 26 wheels and 325 nitto terra grapplers with a leveling kit... going back factory today

First off I am new to DP but stright to business back in June of 07 I bought my first Duramax diesel I was excited being 20 and having my frist diesel. I had it for a couple weeks and my check engine light came on, and I started to get worried about this truck only being a couple weeks old and having problems already. I took the truck back to the dealership and they said it was the mass air flow sensor, so they didnt have any instock so they took one off of a brand new truck sitting on the dealer lot. I drove the truck around hundred miles and the light came on again and this time it felt like the truck has no power and is shutting down which sounds like "limp" mode. So i took it back to the dealership and they again put a new mass airflow sensor on. And i drove it for a couple weeks and it happend agained so i took the truck to the dealership again and said fix it, it was a saturday and the master tech wasnt at work so they couldn't do nothing to it. I am driving back home and my truck just seems like it is about to shut down no power going 30 mphs wouldn't shift nothing so i called the dealer ship and they told me to get it back. They gave me a car to drive and gas money and took them a week to fix it. I cant recall what the mechanic said it was but will find out and post it. If it hadnt gotten fixed that time the lawyer was about to step in, but it was fixed and hadnt had no problem out of it....The mods i had were 18" mkw 26 wheels and 325 nitto terra grapplers with a leveling kit... going back factory today
Paper work paper work got to have all the paper work.

Paper work paper work got to have all the paper work.


Glad to hear that you got it all straightened out. I sure hope this one works out better than the last one.;)

Glad to hear that you got it all straightened out. I sure hope this one works out better than the last one.;)
I appreciate that and to all that support from many of you guys. I still have this infamous hate for the limp mode though.

Towing my jeep from utah to vegas yesterday I limped the truck twice when I was not even under much of a load. After getting home I checked the code and got po299 which I think is turbochager underboost. Intake and exhaust are stock but I am running a tune with EFI live. I read many of the posts but didn't see if there was a solution from GM. Is there a reflash for the ECM by chance. I hav had my truck since about June and have almost 16,000 miles. Only about half of those were running an EFI live tune. Any suggestions?

Towing my jeep from utah to vegas yesterday I limped the truck twice when I was not even under much of a load. After getting home I checked the code and got po299 which I think is turbochager underboost. Intake and exhaust are stock but I am running a tune with EFI live. I read many of the posts but didn't see if there was a solution from GM. Is there a reflash for the ECM by chance. I hav had my truck since about June and have almost 16,000 miles. Only about half of those were running an EFI live tune. Any suggestions?

All I could suggest from past experience with other diesels is with the stock intake and exhaust this is where you are having issues.
Have you checked the turbo-intercooler and intercooler-turbo hoses

All you can try at this time is take out the tune and see what happens.

Towing my jeep from utah to vegas yesterday I limped the truck twice when I was not even under much of a load. After getting home I checked the code and got po299 which I think is turbochager underboost. Intake and exhaust are stock but I am running a tune with EFI live. I read many of the posts but didn't see if there was a solution from GM. Is there a reflash for the ECM by chance. I hav had my truck since about June and have almost 16,000 miles. Only about half of those were running an EFI live tune. Any suggestions?
When is the last time you had your truck to the dealer? There are a ton of new down loads for the 7.5. Possibly one to fix this.

When is the last time you had your truck to the dealer? There are a ton of new down loads for the 7.5. Possibly one to fix this.

I had it in about a month and a half go for an oil change but I am sure they didn't reflash the ECM. I will look into that. Thanks.

AlZDURAMAXX, Sorry to hear about your whole experience. Hopefully your new truck is running just like it should. Not sure what all went down with getting the new truck, but it sounds like it worked out. Sounds like you got some money and a check without any real explanation. Understand if you can not comment on it for legal reasons. Either way good luck with your new truck, maybe you can place an order for a 2009 ZR1 to replace the ZO6 you cancelled. Or hold out for a Camaro as I am.

damn, I just bought the Volant CAI system for my 08. Anyone have this one installed? Now i don't want to install it, lol..

My friend and I pulled our R.V's down to Mexico last winter and we both encounterd to same problem after fillin' up at this one service station(not Mexican). We both had 2004 Sierras. His limp problem happened before mine so we tried changing the fuel filter. We each had a spare filter not knowing fuel quality in Mexico. Solved his problem,then about 20 miles down the road mine went into limp mode as well so we changed my fuel filter and voila no more problems since then.

When is the last time you had your truck to the dealer? There are a ton of new down loads for the 7.5. Possibly one to fix this.

I took it to the dealer today and had them look at it. They said the map sensor was bad and they replaced it. They also updated the programming in my ECM. Hopefully that solves everything.

Oh' boy have you guys got me concerned. I'm moving the family accross the country the first week in August (Ga to Ca) and will be going to the Barstow area. I'll be towing two horses in a tag a long. Any suggestions on anything i need to take with me as I would hate to have me and the family, horses, dog and cat stranded in the middle of nowhere. My truck is bone stock. The heat will be my main concern. Any pointers would be helpfull.

Lots of water once you hit Arizona because after Flagstaff/Williams its going to get real HOT.Would plan the trip across the desert area for very early AM.I live in Bullhead City ,AZ I-40 goes through this area.It will be 100+ before 9am.Will not cool much till you get to Barstow even then will be high 90's.Your truck should be fine.I'm sure the problems (if any)would hit way before then.:eek:



Oh' boy have you guys got me concerned. I'm moving the family accross the country the first week in August (Ga to Ca) and will be going to the Barstow area. I'll be towing two horses in a tag a long. Any suggestions on anything i need to take with me as I would hate to have me and the family, horses, dog and cat stranded in the middle of nowhere. My truck is bone stock. The heat will be my main concern. Any pointers would be helpfull.

Oh' boy have you guys got me concerned. I'm moving the family accross the country the first week in August (Ga to Ca) and will be going to the Barstow area. I'll be towing two horses in a tag a long. Any suggestions on anything i need to take with me as I would hate to have me and the family, horses, dog and cat stranded in the middle of nowhere. My truck is bone stock. The heat will be my main concern. Any pointers would be helpfull.
I carry a scanner in the truck just in case you need to clear a code. Seems to be the next best thing besides a spare tire. Fuel filter would not be a bad idea.

Thanks. I was thinking about the fuel filter and I've heard about the Mack tools scanner. Might order myself one. I will try to carry plenty of water for the animals. Will try to travel in the cooler part of the day. Would perfer to travel at night but finding a horse hotel in the weehours will be tough. Thanks again.

K&N is a big problem,especially on the diesels. GM's not gonna warranty it,so you better tell k&n to pony up.