Duramax Power Reduction
Not sure if this is the right place to post so admin please move if needed. 96 degrees, mountains of North Carolina/Virginia. Climbing around Fancy Gap on I-77 and with no warning truck says "powe...
Forum Discussion
Had that happen on our old 2011 GMC going up a steep grade here in Idaho. Dealer said that it was a known problem and the fix was to flash new firmware to the computer. No problem after that with that truck.
