Two problems related to transmission gear slipping have been reported for the 2015 GMC Sierra 1500. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2015 GMC Sierra 1500 based on all problems reported for the 2015 Sierra 1500.
While driving the transmission slipped while attempting to change gears. This caused the vehicle to be unresponsive and indicate a problem accelerating. This has been getting worse over the past several months and ended up leaving me in a very dangerous situation yesterday while driving.
The transmission seems to slip or hesitate at takeoff. The running lights are too dim to see down the road.