Three problems related to power train have been reported for the 2011 GMC Sierra 2500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2011 GMC Sierra 2500 based on all problems reported for the 2011 Sierra 2500.
When vehicle is warm and shut off, upon restart it will not go in to any gear, there was no warning lamps. An independent repair facility determined the transmission control module was defective. General motors has no parts available, and I know fro a fact it is a rather large issue.
Transmission control module put my truck in limp mode while drinking down the highway.
Vehicle was exhibiting harsh shifting; upshifts/downshifts. Pulling into driveway from rural highway vehicle downshifted and passenger was thrown forward and almost hit the dash with her head, felt like it was shifting into park. Had vehicle towed to dealership. Vehicle would not shift into any gear for mechanic. Transmission repaired along with a wiring harness that prevented the main computer to communicate with the transmission. Reporting this because this is dangerous if this wiring harness fails as we could be out in the middle of nowhere with a vehicle that will not drive. Attaching invoice of repairs that show what parts were replaced by the dealer.