Got all available updates done to my truck this afternoon, and I must say I am impressed with the results. Truck runs like a whole different animal. I didnt really have any of the listed problems for the re-calibration except for the idle smoke. Truck is quieter, more responsive, and doesnt smoke nearly as much with the juice on level 5 like it used to. Plus all that pinging and other noises with juice hooked up appear to be gone. Hopefully the mileage will increase as well. In stock mode it almost feels like it has more hp and torque, maybe the update puts the 05 programming inhttp://www.dieselplace.com/forum/smileys/smiley17.gif

What did you say when you went to the dealer? I am completely stock with none of the problems detailed on these pages. Should I make an appointment and tell them I want the latest calibrations? Is that the correct terminology or should I wait until one of the problems occurs and then have it done. I'm always interested in having my vehicles run better, so if it is worth being proactive about it I will. Thanks in advance for any info.


Dennis

Well I am lucky enough to be buddies with all the service guys at my dealership so I called them up this morning and told them I wanted to get the update done on my truck. There was like 8 things on the Tech II when he downloaded the latest info off the computer, not sure what all of them were, but it was sure worth it.

Is there way to tell if you need an update?

Give one of the techs on here your vin number and they can look it up and see.

with out knowing what is in the truck now, we wont know if it needs to be updated. Vin wont help in this case


We have to download the info directly from the truck

mine just got back today and it does feel different, still some fuel knock in idle and in drive at a stop but no bad knock when accelerating from stop and at 1800 rpm like before, and in park at idle is considerably quiter, so im happy, i just hope it stays that way

I am using the Hypertech programmer, I understood it replaces the factory program....or doe's it work conjunction with? I am curious if I could benefit from the new factory upgrade?

the programmers will install a new tune to the pcm but wont hurt any new flashes that have been done - atleast thats how i understand it

I've had my update for a week now. I've put about 1000 miles on it, and it definitely feels like a different truck. The MPG has improved with to 17.5 for the last two tanks. I was very surprised because I was either crawling in <?:namespace prefix = st1 ns = "urn:schemas-microsoft-com:office:smarttags" /><st1:City><st1:place>Atlanta</st1:place></st1:City> traffic at less than 20 MPH or flying at 75+ with a load in the bed. In the past to get a 17.5 MPH for the entire tank I had to drive no more than 60MPH. I've also notice the other improvements, and it fixed the rough idle at 180 degrees.

Just did the update on saturady evening for my truck..unlike most of
you fellas, I can't say I felt a damn bit of difference....Oh well...It
gets me to work and back home again, so I'm a happy guy http://www.dieselplace.com/forum/smileys/hihi.gif

? for the techs - how do i know what they reprogramed, and how many revisions they made through reprogramming ? do i have to call the dealer and ask them directly ? i went to the site that lists the software updates needed and saw the one that im assuming they did but all the service order says is: Cause = Software, Correction = "Updated software for corrections" - would there be another code or something, im just curious and want to make sure they did all software updates that were available, or do i call them ?

I stood right next to my buddy whos my tech and when he unplugged the TechII from the PC there was like 8 or so items on the display, each one of them consisted of like a number with 8 or so digits.

hmm, the reason i ask is that the flash seemed to fix the fuel knock that i was getting just off idle and at 1800rpm, but now it sounds terrible until about 175 degrees engine temp - i called the SM and he said that the re-flash couldnt fix everything that it was somewhat of a tradeoff and that the crappy noise until warm wouldnt hurt it - it does go away, but i thought there was a fix for this as well ?? anyone know or have the reflash # that i should reference when i call back in, thanks

MINE IS A BIT LOUD UNTIL UP TO OPERATING TEMP AS WELL, BUT I THINK THAT IS COMMON WITH MOST DIESELS. WHEN ITS WARMED UP THO, IT IS A LOT QUIETER THAN BEFORE.

definitely, its like a different truck all together and it runs awesome, it was just worrying me a bit the last couple of morning warming up, i guess ill warm her up a bit longer than usual, i sure wish the high idle worked at lower temps for us in cali

Some programs are developed for certain problem. Other programs are developed to improve various things ie throttle responce, improved diagnositics,ect. the programs that were designed to fix something specific are listed with the software ID on TIS( the programmed used to update PCM's) It is allway good to have the latest and greatest software in your veh. If you ask for the software to be updated the dealership should updated it.........they may ask if you have a specific complaint.. just tell them you want to make sure that everything is updated......some service writers who don't know their ass from a hole in the wall will tell you that they only update PCM's if there is a problem....THAT IS A LIE.....GM want's any vehical that comes in to the dealership to have the most up to date programming installed.


Warning!!!!


If you have any aftermarket programming in your Veh. Ie: hypertech it will be erased forever. durring a PCM reflash.

this is true... another warning... a buddy of mine took his truck in for A/C problems. I had sold him my hypertech before he went in. He removed the program before going in. The FIX for his A/C problem was that they modified his code to up the idle 50 rpm's or something like that.


The problem is...once this was done the HyperTech no longer worked. In order for it to work you have to send it back to hypertech and have them reflash IT so it will work...


pain in the butt if you ask me. oh yeah...they charge you $200 for this needed flash.

Moral of the story, don't buy hypertech. http://www.dieselplace.com/forum/smileys/hihi.gif

so then if they recalibrate something on the pcm will none of the programmers work ? i find that hard to believe but maybe thats the case, dunno ??

It will vary between tuner manufacturers. Most likely the new tuner will accommodate either versions.

Had my truck reflashed today. First thing I noticed was about %10
quieter at idle. Smoother running overall. Quieted the wierd pinging
noise at around 1800 RPMs. I hope it will improve my mileage, but I
will have to wait and see for that. I would say it's worthwhile!



Todd

hmmm, maybe I should get mine done. So far no ill effects that I've seen.


My truck doesn't seem to have any of the problems so far. Maybe I just don't notice them. http://www.dieselplace.com/forum/smileys/smiley9.gif I am really hoping for better fuel mileage especially when towing.Edited by: Max Power

Had mine done Fri. just before a 700 mile round robin trip to take camper in for service so 1/2 trip was loaded and 1/2 was empty. Noticed it was a little smoother and quieter (not a huge improvement but noticable) Fuel mileage didnot change still around 12 mpg loaded with 11.5 ft camper and 18.5 mpg empty at 70 mph. I did some playing with speed since I wasn't in a hurry this is all by D.I.C. and not hand calculated but it has been pretty acutate. Results are 24 mpg at 55 mph and a drop of 2 mpg for every 5 mph.


55 mph = 24 mpg


60 mph = 22 mpg


65 mph = 20 mpg


70 mph = 18 mpg


75 mph = 16 mpgEdited by: max camper

That's about what I max camper. My LB7 didn't really make much of a differnce between 55 and 70. It's the towing mileage that I don't like. http://www.dieselplace.com/forum/smileys/smiley5.gif

My post-flash mileage on the DIC as of this morning:


45 mph = 37 mpg (!!)


55 mph = 29 mpg


60 mph = 25 mpg


65 mph = 23 mpg


70 mph = 20 mpg


75 mph = 18 mpg


Why the huge gap from 45 to 55? Who knows, but it sure is fun to watch that MPG number be so big! If I remember correctly, I was getting about 1-2 MPH less pre-flash. I am not sure what the +- is for the DIC. I have 3400 miles so far.

Has anybody reflashed an 05 yet? It doesn't have any real bad problems, but it is a real dog. Had a burro on grass outrun me the other day. Embarassing.Edited by: gardnerteam

how do you get the dealer to download the new program? is there like a bulletin number or what ? my dealer says he cant find anything

promod - your dealer (well, the technician anyway) has to plug the tech2 into your diagnostic port. After loading your truck's information into the tech2, they have to plug the tech2 in to a computer online with GM....From there, GM will read your vin and they will know if there are any calibration updates for your truck....

my only gripe about this software update or whatever it is, and this is just for my truck only - now it sounds like a friggin mac truck before it warms up to 175 degrees, now that just aint right, it didnt do that before, so now im gonna bring it back in as it sucks until its warm, and the dealer is no help, they barely know anything, what a crock http://www.dieselplace.com/forum/smileys/smiley7.gif


they said they would have to re-evaluate it, im like just friggen program in the document id that fixes it, "it doesnt work that way"

How long does it take from start to finish to update the compter(s)? I
would like to see about arranging to stop in on my way to work one
morning and have it done, if possible. None of this all day loaner
junk...

I was in at 8AM and out by 9:30. The dealer said I was the first one they did. I gave him all the info on the flash several days before and he said he would have to download the flash from GM. Truck idles quieter. Thats the first thing I noticed when I fired her up. Still idles at 700 rpm though. I'll have to hand calculate the mileage, (no dic), on my next fill up. Hoping for better mileage. MacEdited by: mac1234

Mac, does that mean you lost the DIC due to the update? Or did you not have it to begin with? I am most anxious to find out about the mileage thing as well.


Jumper357

I have an 05 and I asked the dealer to preemptively flash the new
changes when I had it in for service. That part cost me $35 because I
did not have a specific problem for which I wanted a fix. No obvious
change in behavior after the re-flash.



This is my first DMAX and it only had 1800mi on it when I had it in for
service, so I did not have enough base data to even remember if it
behaved much differently before the flash than it does now. Ran well
before. Runs well now. Get 13.5mpg towing an 8,300 lbs camping trailer.
Get 18-19mpg solo, in mostly hi-way traffic.

I stopped at the dealers shop today and asked about any updates for my 04 LLY and they didn't know of any and said they couldn't find any on the computer. Can somebody give me number or something that they could use to look it up with. I have complained about my fuel milage before and was told there is nothing wrong, it is because of the increase in HP. My 02 would get 10-12 pulling a 27' fifth wheel. My 04 has been getting 7-9 pulling the same fifth wheel.

I had the same trouble when I tried to get mine reflashed. I had a rough idle problem at a stop with brake on, that showed up after 11k miles. My dealer told me that same crap, that there isn't any regular updates, that they couldn't find any thing on there computers either http://www.dieselplace.com/forum/smileys/smiley5.gif The other morning my glo plug light on dash wouldn't go off, and when I finally tried to start it, it started rough and blue smoke. Service engine light never came on. I had it! So I called a couple of larger dealers to discuss these probs. and they told me that I would have to bring it in to check for codes thrown. Then they would try to get the fixes for codes thrown, I went back to my dealer and told them what these other dealers told me and I said I'm bringing it in and they finally got the updates for the problems I had. Brought it home and it runs great(seems smoother) I don't think they will do any thing for D-maxes that don't have any problems though. GOOD LUCK OUT THERE http://www.dieselplace.com/forum/smileys/smiley20.gifEdited by: BlueCrew 04 D/A SB GMC

whitesnake --- there shouldn't have been a charge for a calibration
update....that's a bunch of bs!! GM wants these trucks to have all of
the current software updates installed....I would be having a chat with
the service manager if I were you......http://www.dieselplace.com/forum/smileys/smiley18.gif

Mac, does that mean you lost the DIC due to the update? Or did you not have it to begin with? I am most anxious to find out about the mileage thing as well.


Jumper357








No Jumper. Never had the DIC. Mines just a work truck.

Before my reflash I had a slight surge and combustion ping before, but nothing too serious. Here's what I found so far WITH my reflash:


Small surge when creeping along at idle with a very light amount of brake pressure. Truck seems to "jiggle" almost like it's going to stall, but the RPMs stay consatant at around 700 or so. You can see the DRL's bounce a little in the reflection from the car in front of me when this happens.


Pronounced change in engine pitch when completely stopped and then take foot of of brake with no throttle. Seems to sound like RPMs are increasing, but they do not seem to move on the tachometer.


Truck now seems a little sluggish from second gear and up. Not as quick feeling as before.


Anyone else see this after the reflash?

ive noticed some of that pinging for sure and the whole loud engine noise before warm up is terrible, not sure if anyone else has that though

I just got my updates this morning... Milage SEEMS to be up a little,
and the truck might be a little quieter... FWIW, my DIC did NOT get
reset. I had the tech look at the balancing while he had the Tech2
hooked up, and most of the cylinders where around .5, but 4 &amp; 5
where up (one was like 2.X and the other was like 3.3). What's anyones
input on that? Should I worry or not? I'm going to be pulling around
12-13k in the next 6-8 weeks...

I picked my '04.5 LLY up on 8/27/04.


I can't complain about any drivability issues, it idles smoothly, runs smoothly, and doesn't smoke.


Is there any reason for me to get the lastest and greatest update available? My milage is getting better and better. I've used both Diesel Kleen and Stanadyne Peformance Formula, and with about 2200 miles on the clock, I'm consistently averaging 17.5 mpg @ 70 mph.


I'm planning on getting some sort of a "chip" in the near future, if that makes any difference.


Should I get the updates or be glad with what I've got?

Guess I won't flash my wifes truck.


She got 28 mpg @ 65 mph between Junction and Fort Stockton on cruise mostly empty. That isn't too bad and we don't have any high temps, oil sucking or odd noises. Just can't really complain. It does GOOO when you step on the diesel pedal too.

Took mine in after disconnecting the juice, and asked them to update the calibrations. They said what is it doing? Well, I could'nt tell them about the juice only knock, so told them it was knocking. They could not get it to do it (no kidding!) so they did not reflash anything! The truck runs perfectly without the juice. 13k miles 04 LLY. Thinking seriously about sellin the juice, don't need any more power than stock, nor the problems. Since I re-connected the EGR and took out the juice for the service visit--thinkin on just leavin it that way, in fact, thinkin about just leaving everything about the truck stock (except the nictane) put 100k on it and unload it!

redneck,


that just doesn't make sense to me, as a GM tech for 10 years they don't get paid for doing nothing but if they just do the reflash they get piad 0.7 hr. I think. As for leaving it stock, nothing wrong with that, as thats how most of them are out on the road.


Max

GM pays .4 for a reflash which is good IF your TIS2000 terminal isn't being hogged by some guy surfin the Diesel Placehttp://www.dieselplace.com/forum/smileys/hihi.gif

Isn't there an add of 0.1-0.3 for Diag. for a potential of 0.7 , I am no longer a tech so my memory may be a little off.

jefro:


How in the world did you get 28 mpg going 65 mph?! I realize that milage is very subjective, but there's no way I'd get 28 mpg @ 65 mph no matter what I did.


Was the entire trip downhill?

Guess I won't flash my wifes truck.


She got 28 mpg @ 65 mph between Junction and Fort Stockton on cruise mostly empty. That isn't too bad and we don't have any high temps, oil sucking or odd noises. Just can't really complain. It does GOOO when you step on the diesel pedal too.





Must have been down hill with a strong wind at her back.

Well, thats my dealer, they're close and that's where I bought her. Hell, they could have gasser techs working on the damn thing! They did say they would replace the idler pulley (to fix the belt noise), but they gotta order it and it could take awhile. I figure I run it till the belt flies off and then they can come and get me and my truck!

Yeah, you are right, there is an add of .1-.3.... BUT, they won't pay you diag if there is a TSB or a PI. Cheap bastardshttp://www.dieselplace.com/forum/smileys/smiley7.gif

Complain about a low speed surge and poor fuel mileage and they should reflash. Mine picked up an honest 2-3 mpg towing!

Hello


I had my LLY reflashed and It still knocks so loud it will drive you nuts.http://www.dieselplace.com/forum/smileys/smiley7.gif I got 8k on now. BUThttp://www.dieselplace.com/forum/smileys/smiley4.gif I put some stanadyne in it and it's helped alot. thats sad that you need to add to the fuel to shut the diesel up.http://www.dieselplace.com/forum/smileys/smiley21.gifEdited by: westwindsdiesel

jefro:


How in the world did you get 28 mpg going 65 mph?! I realize that milage is very subjective, but there's no way I'd get 28 mpg @ 65 mph no matter what I did.


Was the entire trip downhill?





It's creative mathhttp://www.dieselplace.com/forum/smileys/smiley4.gif

Mine actually does kind of have a low speed surge, but I figured it was just the low first gear combined with the diesel making a lot of torque early in the RPM range.

My 2005 truck was just built. Same truck as my 2003.


Need to update my sig.


Can I assume any issues here were already addressed?


Or does ass-ume make an A$$ out of me for even thinking that?


Anyone know?


Thanks

LET ME LET YA IN ON A FEW FACTS,I AM A GMC SERVICE MANAGER,GM 'S POLICY IS ,IF A VEHICLE HAS A CONDITION IN WHICH A NEW CALIBRATION HAS BEEN ISSUED TO ADDRESS THE PROBLEM,GM WILL PAY TO HAVE IT REPROGRAMMED.GM DOES NOT PROGRAM VEHICLES JUST TO PUT THE UPDATED CALIBRATION IN.WE TRIED IT AND HAD THE CLAIMS KICKED BACK.OUR AVM WANTED A COPY OF THE BULLENTIN ATTACHED TO THE REPAIR ORDER THAT SAYS A UPDATE IS NEEDED FOR THIS CONCERN.THE LATEST COMPLAINT WARRANTING AN UPDATE IS SLOW PARKING LOT SURGE.WHEN UPDATING FOR THIS CONCERN,ALL LATEST UPDATES WILL BE AUTOMATICALLY LOADED.TO ANSWER SOMEONE ELSE QUESTION,IT TAKES ABOUT 10 MINUTES TO DO ONCE A TECH GETS HIS HANDS ON IT.

tmartin,


to make sure I dont look like an a$$ when I go in, do I just tell them the truck surges in the parking lot when driving slowly? Is that what slow parking lot surge means? I would like to take advantage of this if possible but don't want to look like dummyhttp://www.dieselplace.com/forum/smileys/smiley18.gif.


TIA,


Jarrod

Laugh if you want.


She writes down everything on her trucks. Time date mileage gallons cost hours. EVERYTHING! She went from Junction Texas to Fort Stockton Texas. It is mostly flat. It computes almost exactly as what the dic says. Her average is 17.7 combo town and highway.


That is what I expect too. My 84 and 82 had good mileage. The one ton dually gets 18 highway. I have only gotten it to drop to 12 with a 18,000 trailer.Edited by: jefro

I am curious to the updates as well. My 04 also does a jerking type thing if I am trying to go slow. Is that normal or is that one of the problems GM is fixing.

JARROD,THEY SHOULD NOT LAUGH,TELL THEM ABOUT THE SURGE AND GIVE THIS DOCUMENT ID NUMBER THEY CAN LOOK UP IN SI ON THEIR T-8,#1550216.THEY SHOULD NOT HAVE A PROBLEM PROGRAMMING IT.