2010 GMC Yukon Owner's Manual - Page 17

Starting and Operating Your Vehicle Starting the Vehicle WARNING: (Continued) However, once the brake pedal is released, the vehicle can move. The vehicle's engine can also restart at any time. Shift to P (Park) and turn the ignition to LOCK/OFF, before exiting the vehicle. Start the engine as you would any other engine. See "Starting the Engine" in the owner manual for more information on starting. If pulling a trailer with trailer brakes, see Towing a Trailer on page 5‑8 for more information. { WARNING: Exiting the vehicle, without first shifting into P (Park), may cause the vehicle to move, and you or others can be seriously injured. Because the vehicle has the Automatic Engine Start/Stop feature, the vehicle's engine might seem to be shut off when you come to a complete stop. (Continued) 3-3