Table 1 shows one common exterior lighting related problems of the 2014 GMC Sierra 3500.
| Problem Category | Number of Problems |
|---|---|
| Exterior Lighting problems |
Transmission control module failed. Reduced power to vehicle to first gear. Blinkers, speedometer door locks, and other safety and driving devices did not work. Check engine turned on. Device is held at some GMC dealerships nationally however they will not sell the part to have the truck repaired.