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  1. 11-16 LML Duramax Powertrain
    Okay, where to start... it's a 2016 lml duramax with 116k miles. It was hit (minor) and was in the shop for 2 months. Had the repairs done where I made them get the entire front end fixed (damages were only to passenger tire, and axle, etc..) anyhow I cannot seem to figure this issue out...
  2. 11-16 LML Duramax Powertrain
    Doing a cp3 conversion truck is bone stock other then a Airdog. on the feed line in the valley of the engine it has a nut that holds it together will not stop dripping i’ve tried tightening it all the way down as tight as i can get it i’ve tried re seating it and still can’t get it to stop...
  3. 11-16 LML Duramax Powertrain
    Hey there! I work at a shop in Southern Florida and we have a mind boggler, was curious if anyone here has had any similar issues. 2016 LML Silverado 2500 Running rough, choppy, shuts off. Truck was brought in for issues stated above as well as some suspension component's. First issue at hand...
  4. General Discussion
    Trying to find out if anybody can help, i have a 2014 lml duramax that started to misfire and run rough. Replaced injectors but was still recieving an engine code for cylinder 1 misfire. Replaced the injector pigtail harness because i read that sometimes they can go out do to a sharp bend or a...
  5. 11-16 LML Duramax Powertrain
    Hey guys, sorry to bother. I'm starting to scratch my head wondering where to begin the diagnostic process. So the truck acted like it had bad batteries, and would begin to crank for a few seconds, but then click. So, I tried checking batteries, and they said 12.3V @ both batteries. (Was using a...
  6. How To's, DIY and Write ups
    Hey guys, I have a 2014 GMC 2500 with the LML and had the infamous CP4 failure the other day at 118k. Im currently pulling the injectors and got 1-7 done but I'm having a total brain block on how to get the 8th injector high pressure line off the fuel rail without pulling the turbo. I cant get a...
  7. General Discussion
    Bough a 2012 lml Duramax in 2016. The first year was great, year two got home one day with the truck running rough and wouldn't restart after that. Got it towed to dealership only to find out if was a cp4 failure with a 15,000+ repair bill. Get it back two weeks later only to have the def...
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