GM Service Manual Online
For 1990-2009 cars only

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 is in RUN. See Automatic Transmission Operation .

If you cannot shift out of PARK (P), ease pressure on the shift lever and push the shift lever all the way up into PARK (P) as you maintain brake application. Then, move the shift lever into the gear you want.

If you ever hold the brake pedal down but still cannot shift out of PARK (P), try this:

  1. Turn the key to ACCESSORY. There is no shift interlock in this key position.
  2. Apply and hold the brake until the end of Step 4.
  3. Shift the vehicle to NEUTRAL (N).
  4. Start the vehicle and then shift to the drive gear you want.
  5. Have the system fixed as soon as possible.