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 1534 (HYBRID ENGINE CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC B009FCIRCUIT/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 is about a different car, the 2008 GMC Yukon and 2008 Chevrolet Tahoe. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT:
When removing connectors inspect for damage or corrosion. Damage or corrosion in the following requires repair or replacement of the affected component/connector:
- The HVCID
- The SDGM module
- The HVCID wiring harness connector
- The SDGM wiring harness connector
- Ignition OFF, if DTC B009F is current, disconnect the harness connector at the HVCID sensor.
- Disconnect the X2 harness connector at the SDGM.
- Test the signal and voltage circuits between the SDGM and HVCID sensor for a short to voltage, short to ground, or open/high resistance.
- Connect all components, then ignition ON use the scan tool to clear the DTCs, then recheck for DTCs.
- Ignition OFF, wait 2 minutes.
- Ignition ON, recheck for DTCs.
- If DTC B009F resets, replace the HVCID sensor.
- Ignition ON, with a scan tool, clear the DTC.
- Ignition OFF, wait 2 minutes.
- Ignition ON, recheck for DTCs.
- If the DTC returns and is current, replace the SDGM.
- After the DTC has been cleared from the SDGM, the HPCM must be reset by using the scan tool Impact Detection Status feature under the HPCM special functions list. Upon using this function, the ignition must then be turned OFF for 2 minutes in order for the function to reset.
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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.