The problem is with a part in the automatic transmission that could wear prematurely, causing harsh shifts and potentially locking up the rear wheels while driving when the transmission shifts out of eighth gear.

To fix the problem, dealers will install new, free software that can detect this condition. If the software determines that the drivetrain is worn, it will limit the transmission to fifth gear. The driver will experience slow acceleration and notice warning lights on the dashboard until they restart the vehicle.

According to documentation provided to the National Highway Traffic Safety Administration, GM is aware of 1,888 reports of rear wheel locks, including 11 incidents involving vehicles that veered off the road and/or caused property damage and three minor injuries.