Two problems related to vehicle shudder 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.
The automatic transmission has a hard shift when going from park to reverse or park to 1st gear. The vehicle shudders when at interstate speeds causing a shake similar to running over interstate road bumpers/ lines. This has been brought up to the dealership several times and they reset the "learning transmission" fixing the problem temporarily for a day or two.
Called dealership about one week after purchase in August 2015 and reported vibration in vehicle at speed of 70 and above. No return call. Never had truck inspected. Vibration has increased with age of the truck. Truck has 55,000 miles on it now. Just now finding out about numerous complaints having been filed. Found information at autoguide. Com. Gm has issued bullet6in #pi1354c relative to this.