2003 GMC Safari Owner's Manual - Page 102

Automatic Transmission Operation There are several different positions for your shift lever. Don't leave your vehicle when the engine is running unless you have 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 parking brake and move the shift lever to PARK (P). See "Shifting Into Park (P)" in the Index. If you're pulling a trailer, see "Towing a Trailer" in the Index. %sure the shift lever is fully in PARK (P) before starting engine. Your vehicle has an automatic transmission shift lock control system. You have to fully apply your regular brakes before you can shift from PARK (P) when the ignition key is in RUN. If you cannot shift out of PARK (P), ease pressure on the shift lever - push the shift lever all the way into PARK (P) as you maintain brake application. Then move the shift lever into the gear you wish. See Shifting Out of Park (P) on page 2-29. 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. It is dangerous to get out of your vehicle the in shift lever is not fully PARK (P) with the parking brake firmlyset. Your vehicle can roll. CAUTION: (Continued) 2-23