GMC C20 Problems by year

Loose pivot bolt holding the brake pedal to its support bracket could disengage from the nut.

On c and k models, feed and or return fuel lines can contact the automatic transmission shift linkage cordon shaft. In addition, on k models lines may also contact front propshaft. In either case the fuel lines could be damaged resulting in a fuel leak.

The rear axle shafts received improper heat treatment during manufacture. The shaft may break and the tire and wheel assembly could disengage from the vehicle.

The hydraulic brake fluid used in certain vehicles may fail to comply with the brake fluid boiling point requirements of federal motor vehicle safety standard no. 116, "Motor vehicle brake fluids". Braking efficiency may be reduced and vehicle stopping...

Fatigue cracks may develop in the brake vacuum booster housing. This may cause a vacuum leak and reduce the effectiveness of the brakes. After prolonged use, the cracks may develop to the extent that the booster may separate from the vehicle.

On the involved vehicles the brake stoplight and cruise control switch which is operated by the brake pedal may have been assembled with an incorrect lubricant on the actuating plunger. This can cause the rear brake stoplights to become inoperative and the...

The accelerator pedal rod in combination with the pedal installed on the involved vehicles may cut through the floor pan rubber mat or carpet into the thick resilient insulation pad underneath during heavy or repeated full throttle applications. As a result...

The front suspension control arms were assembled with ball joints which may contain sockets that were not properly heat-treated. This may cause the socket to wear rapidly and allow the ball joint stud to separate from the socket, causing either the left or...