1997 GMC Sonoma Owner's Manual - Page 80

Shifting Out of PARK(P) (Automatic Transmission) Your vehicle has a brake-transmission shift interlock. You have to fully apply your regular brake before you can shift from PARK (P) when the ignition is in the RUN position. See "Automatic Transmission Operation" in theIndex. Parking Your Vehicle (Manual Transmission ModelsOnly) Before you get out of your vehicle, turn off your engine, put your manual transmission in REVERSE (R) and firmly apply the parking brake. If you have four-wheel drive with a manual transfer case shift lever, be sure your transfer case isin a drive gear. Your vehicle could roll if it isn't. If you are parking on a hill or pulling atrailer, see "Towing a Trailer" in the Index. If you cannot shift out of PARK (P), easepressure on the shift lever -- push the shift leverall the way into PARK (P) as you maintain brake application. Then move the shift lever into thegear you want (you must press the shift lever button if you have the console shift lever). If you ever hold the brake pedal down but still can't shift out of PARK (P), try this: 1. Turn the key to OFF, 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 you can. 2-32