GM Service Manual Online
For 1990-2009 cars only

Action

Normal Result

Abnormal Result

  1. Turn the ignition switch to the ON position.
  2. Attempt to shift the transaxle out of the PARK position.

The transaxle cannot be shifted out of the PARK position.

Automatic Transmission Shift Lock Control Always On with Ignition in Run

  1. Turn the ignition switch to the ON position.
  2. Depress the brake pedal.
  3. Attempt to shift the transaxle out of the PARK position.

The transaxle can be shifted out of the PARK position.

Automatic Transmission Shift Lock Control Inoperative