Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
1998 GMC EnvoyFACTORY OEM SERVICE PROCEDURE
Automatic Transmission Shift Lock Control System Check
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. | Automatic Transmission Shift Lock Control Inoperative Automatic Transmission Shift Lock Control Always On With Ignition in RUN |
Factory Service Tools
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
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