general problems of the 2012 GMC Sierra 2500

Failed transmission control module (24256861). While driving in the early morning hours (darkness) taking my child to school, I was navigating through a busy intersection when the vehicle surged and then made a loud metal on metal sound, feeling as if someone had struck me from behind. At that point the power train became inoperable, stranding us and coming very close to being first, struck from behind and then from cross traffic. The vehicle was/has been inspected by a gm technician at starling Chevrolet, st cloud, FL and the tcm was found to have failed (trouble code u0101, lost communication with tcm). It has been at the dealership for going on four months awaiting the production of a replacement part(tcm). There was no prior indication that the tcm was about to fail. Upon failure, all lights on the vehicle display flashed and the indicator for the vehicle drive position was lost (p, r, n, d), no longer visible.

Driving on the expressway around 60 mph when the truck went into limp mode slowing me down to 40 and then would not shift gears tcm went out gm told me that there is a big problem.

The contact owns a 2012 GMC Sierra 2500. When using the snow plow, the headlights dimmed and the heat decreased as if it were turned off. The contact mentioned that the volts decreased when using the plow, which may have caused the failure. The vehicle was taken to the dealer, but the cause of the failure could not be diagnosed. The manufacturer was made aware of the failure and sent an investigator to diagnose the vehicle. The vehicle was not repaired. The VIN was not available. The failure mileage was 18,500.