I have a 2010 LMM I believe it's the lemon of Duramax Diesels at 50000 miles wiring harness shorted out at work wouldn't run the stealership said bad fuel $800.00 drove home from work 2 hrs. Truck refused to start ,towed to dealership where purchased they found bad wiring harness short from rubbing ? $800.00 Bad design? At 100000 miles did it again on a trip harness replaced another $800.00 . So next thing I got to tow for the first time ever 600 lb Harley 1000 pound trailer think I well under on towing . 90 degrees outside throws P0087 code . Have a FASS lift pump installed and EFI live and EGR delete hopefully fixes problem . Nope still on going does it need a rebuild with new injectors and a new CP3 ? I'm lost just tired of nobody being able to fix it but taking my money . Can anybody recommend a good shop with that will call you back close to Berkeley Springs WV 
