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Duramax 6600 Discussion Forum for the Duramax 6600 Diesel Engine, including the LB7, LLY, LBZ & LMM engine specific topics.

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Old 11-30-2006, 11:22 PM
kconnair's Avatar
kconnair kconnair is offline
Diesel Burb
Join Date: Nov 2003
Location: Warner Robins, GA
Posts: 65
Question Hesitation or "cough" on acceleration

One of my co-workers has an '05 Duramax 2500 HD crew cab - loves the truck except for one thing: under hard acceleration (full or close to full throttle) the truck hesitates. Is this the defueling I have heard about to preserve the tranny? If this is the deal, is there any way to improve it? Truck is not modified.

It almost feels like the wastegate has opened at the wrong time. Only seems to do it in first gear. It is significant, and it bothers him. If it is "normal" at least he will have something to work with.

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Old 11-30-2006, 11:41 PM
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DmaxMaverick DmaxMaverick is offline
Join Date: Apr 2001
Location: CA
Posts: 11,284

His turbo doesn't have a wastegate. It is variable vane. The servo that controls it, or the connectors may need some attention. Defueling during shifts is normal, but it shouldn't fall flat while staying in gear.

Also, a fuel filter needing replacement, or an air leak will cause this. Always start with the filters (air and fuel), then move on to the electronicals.
1985 Blazer 6.2
2001 GMC 2500HD D/A
2014 Chevy Cruze Diesel - Fabulous car, no problems at all, but sold Nov. 2016 @ 55K miles.
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Old 12-01-2006, 09:38 AM
ckt ckt is offline
Join Date: Oct 2005
Posts: 23
Default Hard acceleration cough

My 05' did this. There is an updated program available through the dealership that takes care of it.
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Old 12-01-2006, 10:05 AM
up@12 up@12 is offline
Join Date: Nov 2006
Location: Ontario
Posts: 29

Is there a website you can go to find out what updates there are for your truck without using the dealership
2007 2500HD Chevy
1965 chevy P/U big block 410 gears 4 speed
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Old 12-05-2006, 08:53 PM
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kconnair kconnair is offline
Diesel Burb
Join Date: Nov 2003
Location: Warner Robins, GA
Posts: 65
Lightbulb Dealership fixed it!

Thanks for the tip CKT!

My friend from work took his '05 in again about the problem, and after hashing it out, and knowing almost for certain that there had to be a fix and it was not normal, their lead diesel tech listened to what he was saying, and looked up tech bulletins, and found an answer under the title "surge". It said that the tech was supposed to treat it as if the ecu was loading a certain "hard" code even though it was not, and he fixed it with an ecu flash with an updated program. Seems to have worked. He will know for sure after a few warm days, it is masked when the engine and truck are cold.

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Old 12-06-2006, 03:52 PM
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kconnair kconnair is offline
Diesel Burb
Join Date: Nov 2003
Location: Warner Robins, GA
Posts: 65
Thumbs up Warranty Code for dealer

The warranty code listed for the problem is 1015F. That should get the service writer in the neighborhood if you are having a similar problem.

Good luck,

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