GM Service Manual Online
For 1990-2009 cars only

Shift lock release prevents shifting out of P (Park) unless the vehicle is running or in Accessory mode and the brake pedal is applied.

The shift lock release is always functional except in the case of an uncharged or low voltage (less than 9-volt) battery. See Jump Starting for more information.

To shift out of P (Park) use the following:

  1. Apply the brake pedal.
  2. Press the shift lever button.
  3. Move the shift lever to the desired position.

If you still are unable to shift out of P (Park):

  1. Fully release the shift lever button.
  2. While holding down the brake pedal, press the shift lever button again.
  3. Move the shift lever to the desired position.

If you still cannot move the shift lever from P (Park), consult your dealer/retailer or a professional towing service.