GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 1999 🢒 Envoy - 4WD 🢒 Steering 🢒 Steering Wheel and Column - Tilt 🢒 Automatic Transmission Shift Lock Control System Check

Step

Action

Normal Result(s)

Abnormal Result(s)*

1
  1. Turn the ignition switch to the RUN position.
  2. Attempt to move the shift lever out of PARK.

The shift lever is locked in PARK.

Automatic Transmission Shift Lock Control Inoperative

2
  1. Turn the ignition switch to the RUN position.
  2. Press and hold the brake pedal.
  3. Move the shift lever out of PARK.

The shift lever moves freely out of PARK.

* Refer to the appropriate symptom diagnostic table for the applicable abnormal result.