2003 GMC Sierra 1500 Pickup Owner's Manual - Page 113

Automatic Transmission Operation If your vehicle is equipped with an automatic transmission, it features an electronic shift position indicator within the instrument panel cluster. This display must be powered anytime the shift lever is capable of being moved out of PARK (P). See Fuses and Circuit Breakers on page 5- I I 1. f your VI > shift lever is not fully inPARK (P) with the parking brake firmly set. Your vehicle can roll. I ; dangerous get to ou There are several different positions for your shift lever. PARK (P): This position locks your rear wheels. It's the best position to use when you start your engine because your vehicle can't move easily. If your vehicle is equipped with the Allison@Transmission, use park for stationary operation of the Power Takeoff (PTO) (if equipped). Don't leave your vehicle when the engine is running unless youhave to. If you have left the engine running, the vehicle can move suddenly. You or others could be injured. To be sure your vehicle won't move, even when you're on fairly level ground, always set your shift lever to parking brake and move the PARK (P). See "Shifting Into Park (P)" in the Index. If you're pulling a trailer,see "Towing a Trailer" in the Index. 2-26