Hi Guys,

-question: did everyone get this done?

-my truck is bone stock, so no worries taking it in, just havent had time, yet

-called the stealer today, and they said it would take "several hours" to do this, so i had to make an appointment, leave the truck, etc.....is that right??? it takes that long? I thought this was a quick fix?

thanks for the info

ted

Hi Guys,

-question: did everyone get this done?

-my truck is bone stock, so no worries taking it in, just havent had time, yet

-called the stealer today, and they said it would take "several hours" to do this, so i had to make an appointment, leave the truck, etc.....is that right??? it takes that long? I thought this was a quick fix?

thanks for the info

ted
Had mine done 4 months ago. I watched. It took about a hour. I could not tell any difference. It is a quick thing. Watch them stealers. They are a bunch of crooks.
:lol2::lol2::lol2:

i took mine in and waited and it took about an hour. actual time it takes to reflash should only be minutes. try another dealer maybe. but like wildcat. said, watch the dealers! good luck.

denny

I had mine done and seemed like it would go into regen a lot less often and when it did it would not last quite as long. Had mine done with a few other things so I left it overnite.

ok, thanks, this is what I thought. I called a GMC dealer (that i got a good recommendation for) and they said about an hour. too bad i have a chevy- the GMC guys said they couldnt do it-

It takes about 1/2 hour with a mdi module...not all dealers are crooks...

Had mine done yesterday. Took about a hour and a half. Wasn't able to tell any difference in the 100 miles I've driven since then.

It takes about 1/2 hour with a mdi module...not all dealers are crooks...
:DYOU ARE WRIGHT. I take it back. Just 99.9% are BAAAAAAAAAD crooks.Love ya.:D

As long as your are calling the dealer it self a crook and not the tech that works on it. I my have a problem with that.

As long as your are calling the dealer it self a crook and not the tech that works on it. I my have a problem with that.
I still LOVE YA.

I had mine done a month ago. Took about an hour. Final Outcome...... I lost 2MPG.

I had mine done a month ago; no change in mpg. No change in anything, really. And, just to give credit where it's due, the dealer (Paso Robles, CA) disconnected my Banks tuner to do the reflash and reconnected everything for no $$$s.

I had mine done a month ago; no change in mpg. No change in anything, really. And, just to give credit where it's due, the dealer (Paso Robles, CA) disconnected my Banks tuner to do the reflash and reconnected everything for no $$$s.
:)You one lucky man. I have a friend who was handed a letter telling him his warany was voided for having a Edge tuner on his LMM. Better stick with him. Sounds like a good dealer.GOOD LUCK. :)

Mine took about 45 minutes, just waited for it. Could'bt tell a change in anything. Still the same 20-21mpg at 70mph it's gotten since I changed to all synthetic fluids at around 10K.

We for all of you that are having your issues, GM is trying to keep it all quiet. It appears that most everyone having had the recall re-flash done is having a miserable time of it. GM does not want to make it right. We are all guinnea pigs in this one. Its all trial and error at this point. Got that straight from the guys doing the so called fixes. Had my 07+ 2500 HD in for the reflash about 8 weeks ago. It has been back to the dealer 7 times since. It has to do with the DPF system. My Truck had 30k miles on it when the work was done and I only had issues with the regeneration burnoff once shortly before I went in for the recall. Literally melted the Catalytic converter down to a smoldering heep. Hey warranties are great. I was running a Power Pup programmer. It was ideal. Great mileage, excellent power. Now, I get a an regeneration message every time I pull a trailer. Can't even use my programmer. Even after the upgraded flash to the programmer. So I am running stock again. The new ECM stock programming has reduced horsepower. And it seems that it gets worse when I am running in tow/haul mode. Mileage has dropped to even less than before the reflash. The Regen now happens every 212 miles, rather than every 300+. Causing a startling drop in overall mileage, being that the ECM injects raw deisel into the DPF during regen in order to burn off excess soot. In the last 8 weeks I have been in "limp mode" 3 times. Each time pulling a trailer. Top speed 10 MPH, just trying to make it home. GM seems to think that we should not be pulling trailers with these trucks. Or so I have been informed. Now why the hell would you buy one if not to pull a trailer?? Is anyone else out there having any of these issues or is it just me? ( atleast that is what GM is telling me)

I have done a TON of reflashes and have never had a issue....back to the dealer 7 times for a reflash.....

i had mine done and lost 2 mpg also ( not very happy ), they told me it was my fuel filter so i went back and had them change the fuel filter 88.00 later no difference , now they they are telling me it will take a couple tanks of fuel to get it all working right ( they must think i am dumb )

can it reprogrammed back to the flash that was in it stock or before it was reflashed ?

anyone know like the goodwrenchtech ?

mike

Well the dealer and Chevy customer satisfaction( what a joke) wants me to find out what the program is that they are supposed to install. They have my truck so screwed up now I am only getting 10mpg, EMPTY. They are killing me . If there is an actual tech out there that can get me the information as to the flash that is supposed to be installed, please send it to me. I just want my old truck back. Or give me a new truck and put this one on the lemon lot. They want me to figure it out for them. that just kills me. The more I deal with them the more pissed off I get.

Had mine done a few months ago and zero problems since and and never had any problems prior either. Mileage has steadly improved from a fairly consistant 15 mpg when new to 18 sometimes 19 now. 7K plus on the truck now. You can tell how I drive the truck by my advatar so maybe that explains what I consider great milage for a truck this size!
The only change I noticed was there seems to be a slight delay in start up (maybe 1/2 second or so) when I turn the key now. Never noticed that prior.

You cannot go backwards on a ecm reflash, the old reflash gets locked out, its a one way street.

Great.... Just what I needed to hear. So they have trashed my truck and can't go back to start over. Sounds like they need to replace the ECM and start over then.

i thought there was some better milage flash that you could get from gm but you had to tell them you wanted it done ( i thought i read it on here but cant find it ) is this true ?

Great.... Just what I needed to hear. So they have trashed my truck and can't go back to start over. Sounds like they need to replace the ECM and start over then.

It will be the same cal as now, the only cal that can be installed is the latest cal, there is no choice.

I have not had it done, mileage is getting better, unless I can get some better information I will not bring it in.

If you take it in for anything they will do it. I had mine in to replace drivers side window that had some scratches in it and for acid bath and repolish had some rail dust on it(white) and I did not even look at the paper work on it till I got home and they had ECM reflash on it. Don't notice any difference in how it runs or mpg- yet.

If you take it in for anything they will do it. I had mine in to replace drivers side window that had some scratches in it and for acid bath and repolish had some rail dust on it(white) and I did not even look at the paper work on it till I got home and they had ECM reflash on it. Don't notice any difference in how it runs or mpg- yet.

This is exactly why you have to be VERY CLEAR to your dealer about what you want and don't want when you bring your truck in. In my opinion, they should not do ANYTHING on your vehicle without getting your permission first, but I know this happens all the time. I brought my truck in for something really minor when the reflash 1st came out, and I told them "DO NOT do the reflash!!" The advisor laughed and said no problem. I struck up a conversation with him a little later, and he said they are mandated by the service manager to do every recall when a vehicle comes in

what dealer in il was it as I live in Dekalb and would avoid this dealer

what dealer in il was it as I live in Dekalb and would avoid this dealer

Ha Dekalb.. What a small world I live in Rochelle...

:)You one lucky man. I have a friend who was handed a letter telling him his warany was voided for having a Edge tuner on his LMM. Better stick with him. Sounds like a good dealer.GOOD LUCK. :)

It takes more than having an Edge tuner on your truck to void the warranty.

Is anyone else out there having any of these issues or is it just me? ( atleast that is what GM is telling me)

It's just you. :) At least I haven't heard of anyone having all of those issues. I would find another dealer. I haven't seen any change since the reflash. I did have the no-start problem before though...

Ha Dekalb.. What a small world I live in Rochelle...

WOW, I wanna know as well... I live in Rockford :o:

Is the latest version of EFI Live compatible with the new reflash? If so, I'd go LIVE and straight pipe 'em!

I have found a guy here locally, thru a friend of mine, with a full setup for monitoring the systems readings and we are going to log what the truck is doing for a week. No tuning, just straight stock. He seems to feel that the info from Shasta is on the right track, but the only way to do it is to log the daily driving and keep the records. EGR, ECM, TCM, etc...
First it give me ammo to go at GM with, And second, it will atleast get the answers that I have been looking for.

I'll post what I find. Thanks for all the help.

how can you tell when truck is in limp mode.
_________________
2008 cc lb slt.

Oh believe me you will know. It should say on the DIC that you have reduced engine power for one. Top speed 25 mph, down hill, with a tail wind. Does not want to shift. Check engine light on. Just enough power to move the truck and hobble along. Atleast that was my experience.

Oh believe me you will know. It should say on the DIC that you have reduced engine power for one. Top speed 25 mph, down hill, with a tail wind. Does not want to shift. Check engine light on. Just enough power to move the truck and hobble along. Atleast that was my experience.

That exactly right. You will be like :eek:

I have done a TON of reflashes and have never had a issue....back to the dealer 7 times for a reflash.....

obviously you're a tech and i'm wondering if i have to take it in for the flash? i'm worried having a 03 power joke that had a recall for a flash
and was back at the dealer 10 times before i lemoned it.
________________
2008 GMC HD SLT CC LB

It appears that not everyone has the same issues as I do. But I would have a hard time making that decision myself after what I have been thru. Ask your dealer if you have to do it. They will most likely shoot you straight on whether it voids your warranty, not taking it in. It appears that each dealer has their own opinion as to if it is mandatory.

obviously you're a tech and i'm wondering if i have to take it in for the flash? i'm worried having a 03 power joke that had a recall for a flash
and was back at the dealer 10 times before i lemoned it.
________________
2008 GMC HD SLT CC LB

I have not heard of anyone offering firsthand experiences like what you are describing that can be atributed to the reflash. I had it done and have had no issues.

The way I look at it now is that they make warranties for those things.

The way I look at it now is that they make warranties for those things.

If you keep it stock, yes.

how many people have truly had a no-start issue due to programming?

how many people have truly had a no-start issue due to programming?

I did. PITA.

i've gotten as couple of notices for it.my truck is stock.have no problems.i only have 3800 miles on it.as far as i was told the recall will stay open.if the truck does go in for something else they will automatically re-flash unless you sign a waiver???.seems quite a few people have had less fuel mileage after re-flash from what i've read??.my mileage seems to have dropped off a few mpg in the last couple of months with the same driving.

I wonder if the people that are having problems are running chips or tunes after the reflash? I want to find out as much as I can before I take mine in. Thanx

Not since the first reflash. I was warned not to use any kind of download programmer afterwards. Gm is getting real sticky about their warranties and Hot programmers.

I scheduled to take mine in thursday for the ECM reflash. After reading all this I am afraid to take it in. It is stock with a Quad tuner. Already getting piss poor mileage. Don't want to get any worse. Should I take it in or not. haven't had any problems yet!

I scheduled to take mine in thursday for the ECM reflash. After reading all this I am afraid to take it in. It is stock with a Quad tuner. Already getting piss poor mileage. Don't want to get any worse. Should I take it in or not. haven't had any problems yet!
After the reflash I had less regens so my mpg improved a bit. One weird thing I noticed after the reflash was my oil life % indicator drops a lot faster now. It went from 100% to 0% after only about 4500 miles. That's about twice as fast as before. Before you take your truck in you should call Quad and ask if your tuner will function after the reflash. You may have to send it in for an update. They'll let you know what to do to keep rollin.

I cancelled the appointment for now. I did talk to a service rep and he said that the ECM reflash had something to do with Theft Deterent System. Could leave you dead along the road if not corrected.

I did a stupid thing on Friday. Thursday nite I took off the air box to run my block heater cord out the front. Friday went to go to work and truck was in limp mode. Limped it to the dealer and after I got to work I relized that I forgot to plug the mass air flow sensor back in. Called them and told them. While it was there they did the recall on the ECM. That was fine was going to have it done this week anyway. Went hunting this weekend, the same trip I have done the last 4 weekends. I did get about 1-2 miles per gallon better. I have the Quadzilla tuner. Had it set at stock when it went to the dealer and was at stock going hunting. Before I left to come home I was trying to set it at a different tune and not I get a message on the tuner. "Ops, Don't Match, Do You Want To Reload Stock Information" Is this something I need to worry about or push Yes and reload stock information or send it in to have the tuner reflashed.

So I had my truck in for some warranty service, and specifically asked the service advisor NOT to reflash the ECM module. He noted it on the service transcript.

Driving the truck out of the dealership parking lot after the servicing, I immediately noticed that the transmission does not upshift until 1400-1600 rpms. It used to up shift very quickly, especially when the engine was fully warmed up. It stays in gear when slowing down (even on flat ground), which it typically didn't do before.

I'm suspecting they updated the ECM?

Is there a method, at another dealership, that I could ask them to detect whether the ECM was updated or not? Is there an update revision trail left in the data within the ECM? If so, I would like to get this done before bringing back to my original dealership....

Thanks fellas..........

Do a vin check here should tell if they reflashed or not

If the dealer is keeping the actual reflash off the books, would posting my VIN help?

If the dealer is keeping the actual reflash off the books, would posting my VIN help?

Why would they do that?

If you were to survey 1000 people who had this flash, the majority would say they lost MPG, some woud say gain, and some would say unchaged.

The results would likely be the same if 500 or more were given a placebo.

Just get the dumb flash and get it over with UNLESS you have tuning history in the ECM which may be grounds for warranty dismissal.

ALL of my Kennedy Custom tunes are based on the absolute latest GM updates. Very little was changed in the new programming. People just seem to make a lot of the conspiracy theory...

Noted!
I will bring mine in because it sounds like I have to, my truck is running fine and I hope it stays that way.
I have to drive quite far in horrible traffic and construction, then I have to walk around the truck and check for scuff marks, then I have to listen to "YOU CAN SEE THAT"?
I take care of my stuff and dealers don't seem to care.
Please wish me luck that I survive this ordeal:drinking:.
:p:

I called Chevrolet begging and pleading to be able to take the truck to my local GMC dealer but no dice.
I love these people and they treat me and my truck with respect.

Pull the ECM, send it to me (insured) and I can do it here. As easy as that EXCEPT that the GM record will not show it being done. Oh well, someone just forgot to enter it I guess...

Only cost is a few days down time and round trip shipping.

That is a very sweet offer, thanks, I went ahead and done did it.
Only because rumors of voiding warranty because this had something to do with the EGR valve?
Maybe nobody knows?
I put my tin foil hat on heading home and it went like this, it is faster-no it is slower, then I had to turn the radio down because it sounded like valve cover leak, some kinda racket.
A Harley passed, maybe that was it.
But anyway it looks like improved mileage, absolutely not worse,

It was a long day but I think I made a mistake by having the oil changed at the same time.
Thanks to Mr Kennedy for getting my but-t in gear, one more thing to scratch of the list of things to do.:rolleyes:

Pull the ECM, send it to me (insured) and I can do it here. As easy as that EXCEPT that the GM record will not show it being done. Oh well, someone just forgot to enter it I guess...

Only cost is a few days down time and round trip shipping.


This is a very generous offer Sir! I will remember your company when I start thinking about an economy and/or towing tune :cool_shad..

I had mine done about 2 months ago and when I took it in the service manager gave me a call to check about the Banks Cold Air Induction system.

They assumed that I had modified the ECM or added a programmer (which I hadn't - want to keep the warranty !) . They understood that it was just the intake and reprogrammed the unit without any problems.

The only thing I've noticed is that my mileage has dropped by 1-2 MPG, the display calculator mileage had ranged from 16+ around town to 18+ on the freeway (70mph+ with no load). Now I'm registering 15 around town and 16+ on the freeway. In reading the various threads on this topic I have not noticed any PDF regen differences.

On a related note - Anyone out there installed the Banks dual exhaust system ? I'm wondering if it is worth the $$ to improve mileage & performance.

All of the DPF back systems are purely cosmetic. They do nothing to alter the sound or performance.

Trip number 8 to the dealer. Priceless results. They finally got it right. 1000+ miles and it runs absolutely awsome. Finally. Looking at shopping Banks for some pick me up. But gonna wait a few weeks just to make sure.

How do you know when its in ReGen?

How do you know when its in ReGen?

Do a quick search. There are probably hundreds of threads covering this.

Trip number 8 to the dealer. Priceless results. They finally got it right. 1000+ miles and it runs absolutely awsome. Finally. Looking at shopping Banks for some pick me up. But gonna wait a few weeks just to make sure.

What did they do different this time? IMO, dealership= :cookoo: After my last trip to the dealer, I've come to the conclusion I'm better off doing it myself. As far as the reflash, if it ain't broke don't fix it. My trucks running fine, and until somebody really has a clue about what it's all about, I'm leaving it alone. Glad they got yours figured out though.

The rpoblem is that the dealership never knows what they are downloading into the systems. It is actually done remotely.What ever the latest update is. So it could be a different download every time. Tweaking it on the engineering end until they get it right. So not every truck has the same issues afterwords. Mine was a worst case scenario. What a nightmare. Yet they seem to have fixed the program and my dealership is going to notify several other owners that the latest download seems to be the solution.

I haven't put every change under the microscope, but from what I have seen in the past there haven't been any changes to the new OS since released.

My understanding is that it has been modified 4 or 5 different times since June.. Mods have ranged from frequency of regen, to speed at which it will regen, particulate ppm readings in the dpf that trigger regen, etc....several tweaks. At least according to TAC. Which would explain where some people have issues after reflash. Depending on where you are located, Barometric pressure, altitude, class 1 vs. class 2 fuel, all affect every truck different. Problems were pretty wide spread in my area. So when the dealer says to bring it back in so they could try the latest version, to see if it fixes the problems, then it would make sense that it was modified. As I was told, it does not mean that they will recall everyone again though. My dealer is simply contacting the ones having issues in particular.