2009 Chevrolet Express Van Owner's Manual - Page 104

Automatic Transmission Operation { CAUTION: It is dangerous to get out of the vehicle if the shift lever is not fully in P (Park) with the parking brake firmly set. The vehicle can roll. Do not leave the 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 the vehicle will not move, even when you are on fairly level ground, always set the parking brake and move the shift lever to P (Park). See Shifting Into Park on page 2-29. If you are pulling a trailer, see Towing a Trailer on page 4-27. Make sure the shift lever is fully in P (Park) before starting the engine. The vehicle has an automatic transmission shift lock control system. You must first press the brake pedal before you can shift from P (Park) with the ignition in ON/RUN. There are several different positions for your shift lever. P (Park): This position locks your rear wheels. It is the best position to use when you start the engine because the vehicle cannot move easily. 2-24