Stopped at duramax tuning today. They were very helpful. Did a boost test and no leaks. Was unable to get thr transmission controller back to stock, but they are working with EFI Live on yhr fix. Stopped by the dealer on the way home and a diesel tech take it for a ride. Says it's down on power and doesn't sound right. Appointment made for Monday.
Sucks that it isn't a leak and I have to drop it off at the dealer next week. Hopefully the process is painless and they find what's wrong right away
2016 Colorado LT Diesel
Last edited by mrpositraction; 01-12-2017 at 07:46 PM.