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 MANUALSCHEVROLET2008CHEVY EXPRESS G3500, VAN PASSENGER EXTENDEDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 539 (IMMOBILIZER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2008 Chevrolet Chevy Express G3500, Van Passenger Extended
Diagnostic Code Index
2008 Chevrolet Chevy Express G3500, Van Passenger ExtendedSECTION Diagnostic Code Index
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2009 GMC Savana Special, 2009 GMC Savana Camper Special, 2009 GMC Savana, 2009 Chevrolet RV Cutaway, and 2009 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B3031 | B3031 00: Security System Controller In Learn Mode |
| DTC B3055 | B3055 00: No Transponder Modulation or No Transponder |
| DTC B3060 | B3060 00: Unprogrammed Transponder Identification Code Received |
| DTC B3935 | B3935 57: Transponder Authentication Error |
| DTC B3976 | B3976 46: Unconfigured Transponder/Vehicle Configuration Not Programmed |
| DTC P0513 | P0513: Theft Deterrent Key Incorrect |
| DTC P0633 | P0633: Theft Deterrent Key Not Programmed |
| DTC P1629 | P1629: Theft Deterrent Fuel Enable Signal Not Received |
| DTC P1630 | P1630: Theft Deterrent Learn Mode Active |
| DTC P1631 | P1631: Theft Deterrent Fuel Enable Signal Not Correct |
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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.