GM Service Manual Online
For 1990-2009 cars only

Step

Action

Normal Result(s)

Abnormal Result(s)*

1

  1. Put the transaxle in PARK.
  2. Turn the ignition key to RUN.
  3. Press the brake pedal.

The transaxle will shift from PARK.

Automatic Transmission Shift Lock Control Inoperative

2

  1. Put the transaxle in PARK.
  2. Turn the ignition key to RUN.

The transaxle will not shift out of PARK.

Automatic Transmission Shift Lock Control Always On With Ignition in RUN

* Refer to the appropriate symptom diagnostic table for further diagnosis.