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 MANUALSCHEVROLET2002CHEVY EXPRESS G3500, VAN PASSENGER EXTENDED, 8.1 GREPAIR AND DIAGNOSIS (SINGLE PAGE)BODY & FRAMEDOOR LOCKSTHEFT DETERRENT SYSTEM
2002 Chevrolet Chevy Express G3500, Van Passenger Extended, 8.1 G
Theft Deterrent System
2002 Chevrolet Chevy Express G3500, Van Passenger Extended, 8.1 GSECTION Theft Deterrent System
- Description & Operation
- Component Locations
- Programming Theft Deterrent System Components
- Trouble Shooting
- Self-Diagnostic System
- Diagnostic Tests
- Notes
- DTC B0688: Security Indicator Circuit Fault
- DTC B1007: Checksum Value Error
- DTC B2947: PASSLOCK(tm) SENSOR POWER CIRCUIT LOW
- DTC B2948: PASSLOCK(tm) SENSOR POWER CIRCUIT HIGH
- DTC B2957: PASSLOCK(tm) SENSOR DATA CIRCUIT LOW
- DTC B2958: PASSLOCK(tm) SENSOR DATA CIRCUIT HIGH
- DTC B2960: PASSLOCK(tm) SENSOR DATA INCORRECT BUT VALID
- DTC B3031: Controller In Learn Mode
- DTC B3033: System Indicates Tamper
- DTC C0559: EEPROM Checksum Error
- DTC P1626: Invalid Fuel Enable Password
- DTC P1630: POWERTRAIN CONTROL MODULE UNABLE TO LEARN PASSLOCK(tm) MODULE PASSWORD
- DTC P1631: Invalid Password Received
- System Tests
- Removal & Installation
- Wiring Diagrams
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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.