GM Service Manual Online
For 1990-2009 cars only

To shift out of P (Park):

  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. Hold the brake pedal down and 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), see Shift Lock Manual Release.