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 MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 149 (THEFT DETERRENT SYSTEM)
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8
Section 149 (Theft Deterrent System)
2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Section 149 (Theft Deterrent System)
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Schematic and Routing Diagrams
- Diagnostic Information and Procedures
- Diagnostic Starting Point - Theft Deterrent
- Diagnostic System Check - Theft Deterrent
- Scan Tool Data List
- Scan Tool Data Definitions
- Diagnostic Trouble Code (DTC) List
- DTC B2957: BCMs PASS-Key® Signal Circuit resistance
- DTC B2958: BCMs PASS-Key® Signal Circuit Resistance
- DTC B2960: BCMs PASS-Key® Signal Circuit Resistance
- DTC B3031: No Valid Key Pellet Resistance In Memory
- DTC B3094: No Vehicle Security Powertrain Status Message From PCM
- DTC P1626: Loss Of State Of Health Serial Data Message
- DTC P1629: Loss Of State Of Health Serial Data Message
- DTC P1630: PCM Remains In Theft Deterrent Password Learn Mode Too Long
- DTC P1631: Incorrect Password From VTD System
- Symptoms - Theft Deterrent
- Security Indicator Inoperative
- Repair Instructions
- Description and Operation
- Special Tools and Equipment
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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.