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 897 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B1001 (SDM)CIRCUIT/SYSTEM TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition ON, use the scan tool to request SIR DTCs. Verify that DTC B1001 is set as current.
- If DTC B1001 is history, clear codes and recheck.
- Use the scan tool in the SIR menu, go to Data Display then SIR menu, then go to Key Identification menu. Look at the Secondary Key Status to see if the scan tool show this as being Valid. Verify the scan tool shows this Secondary Key Status is Valid.
- If the Secondary Key Status is not valid then look at the Received VIN Digits 2-7. Compare Received VIN Digits to the vehicle VIN.
- If the VIN is different from the vehicle, then the BCM has the incorrect VIN programmed. Use the scan tool to program the BCM. Refer to BCM reprogramming in Repair Instructions for reprogramming procedure.
- Use the scan tool in the SIR menu, go to Data Display then SIR menu, then go to Key Identification menu. Look at the Primary Key Status to see if the scan tool shows this as being Valid. Verify the scan tool shows the Primary Key Status is Valid.
- If the Primary Key Status is not valid, then look at the Received Primary Key. Compare Received Primary Key to the stored SDM Primary Key. If the SDM Primary Key differs from the Received Primary Key, use the scan tool to Setup SDM Primary Key into BCM procedure. Refer to SDM Reprogramming in Repair Instructions for reprogramming procedure.
- Ignition ON, use the scan tool to clear the DTCs. Verify that DTC B1001 is cleared.
- If DTC B1001 is still current, replace the SDM.
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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.