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 G2500, VAN CARGO, 6.6 6REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1542 (IMMOBILIZER SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDIAGNOSTIC CODE INDEX
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Diagnostic Code Index
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Diagnostic Code Index
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC CODE INDEX
| DTC | Description |
|---|---|
| DTC B3006 | B3006 5A: Hood Ajar Circuit Plausibility Failure |
| DTC B302A | B302A 00: Telematic Requested Immobilization |
| 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 P1631 | P1631: Theft Deterrent Fuel Enable Signal Not Correct |
| DTC P1632 | P1632: Theft Deterrent Fuel Disable Signal Received |
| DTC P254F | P254F: Engine Hood Switch Circuit |
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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.