2003 GMC Envoy Owner's Manual - Page 101

Shifting Out of Park (P) Your vehicle has an automatic transmission shift lock control system. You have to fully apply the regular brakes before you can shift from PARK (P) when the ignition is in RUN. See Automatic Transmission Operation on page 2-23. 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 press the shift lever button and move the shift lever into the gear you want. Parking Over Things That Burn If you ever hold the brake pedal down but still can't shift out of PARK (P), try this: 1. Turn the key to LOCK. 2. Apply and hold the brake until the end of Step 4. 3. Shift to NEUTRAL (N). 4. Start the vehicle and then shift to the drive gear you want. 5. Have the vehicle fixed as soon as possible. Thing t can burn could touc lot ex u parts under your vehicle and ignite. Don't park over papers, leaves, dry grass or other things that can burn. ~ I 2-32