2016 fluctuating idle/surging idle, GM can't/won't fix it??? - Page 2 - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #11 of 14 (permalink) Old 10-21-2019, 08:40 AM
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Originally Posted by jstiller View Post
Has anyone figured out what was causing this? I am having the same issue and it is bugging the shit out of me!
Make sure your batteries are good and charged and see if its still doing it.

2011 Chevrolet LML
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post #12 of 14 (permalink) Old 10-24-2019, 11:40 PM
 
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I have the same issue also, 2016 denali Duramax idle at 950 rpm most the of time and does Not throw any codes either. finally bite the bullet brought it in dealer hopefully the computer at the dealership figure out the issue. Unfortunately could not do shit, so after 2 days sitting at the dealer they finally found the engine harness was rubbing against the egr/ac condenser causing a shortage. they replace 2-3 wire were burned down to copper. problem solved and cost me $525 plus tax. all they did was using electrical tape and zip ties the harness out of the way.
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post #13 of 14 (permalink) Old 10-25-2019, 04:51 AM
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The wire rub has been an issue since the 2011 models. I found the issue on my ‘12 and fixed it before it caused any problems. These symptoms are possibly because of the rub issue.

@smokester, has the dealer reflashed the ecm and tcm?



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post #14 of 14 (permalink) Old 10-25-2019, 05:35 AM
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Thanks for this info- do you have a pic of this harness?

2011 Chevrolet LML
PPEI 60HP tow tune
4" Flo pro w/ muffler
Airdog 4g lift pump
Exergy MPROP
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