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.
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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1139 (SHIFT INTERLOCK SYSTEM)
2003 Chevrolet TrailBlazer 4.2 S, 4WD
Section 1139 (Shift Interlock System)
2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Section 1139 (Shift Interlock System)
WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing Diagrams
- Component Locator
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Automatic Transmission Shift Lock Control
- Diagnostic System Check - Automatic Transmission Shift Lock Control
- DTC B2712: Gearshift Lock Circuit Low
- DTC B2713: Gearshift Lock Circuit High
- Symptoms - Automatic Transmission Shift Lock Control
- Park Lock Solenoid Inoperative
- Shift Lever Does Not Move with Brake Pedal Depressed (Buick)
- Shift Lever Does Not Move with Brake Pedal Depressed (Pontiac)
- Shift Lever Can Be Moved without Brake Pedal Depressed (Buick)
- Shift Lever Can Be Moved without Brake Pedal Depressed (Pontiac)
- Repair Instructions
- Description and Operation
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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.