2014 Chevrolet Silverado 3500 HD Crew Cab Owner Manual - Page 399

Vehicle Care 10-33 Automatic Transmission Shift Lock Control Function Check normal effort. If the shift lever moves out of P (Park), contact your dealer for service. Park Brake and P (Park) Mechanism Check { Warning When you are doing this inspection, the vehicle could move suddenly. If the vehicle moves, you or others could be injured. 1. Before starting this check, be sure there is enough room around the vehicle. It should be parked on a level surface. 2. Firmly apply the parking brake. Be ready to apply the regular brake immediately if the vehicle begins to move. 3. With the engine off, turn the ignition on, but do not start the engine. Without applying the regular brake, try to move the shift lever out of P (Park) with Ignition Transmission Lock Check While parked, and with the parking brake set, try to turn the ignition to LOCK/OFF in each shift lever position. . { Warning When you are doing this check, the vehicle could begin to move. You or others could be injured and property could be damaged. Make sure there is room in front of the vehicle in case it begins to roll. Be ready to apply the regular brake at once should the vehicle begin to move. Park on a fairly steep hill, with the vehicle facing downhill. Keeping your foot on the regular brake, set the parking brake. . For automatic transmission vehicles, the ignition should turn to LOCK/OFF only when the shift lever is in P (Park). For manual transmission vehicles, the ignition should turn to LOCK/OFF only when you press the key release button. . On all vehicles, the ignition key should come out only in LOCK/OFF. Contact your dealer if service is required. To check the parking brake's holding ability: With the engine running and the transmission in N (Neutral), slowly remove foot pressure from the regular brake pedal. Do this until the vehicle is held by the parking brake only.