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 PROCEDURESENGINE WILL NOT CRANKCIRCUIT/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.
- Verify no HPCM or engine control module (ECM) DTCs are set that would disable high voltage or that identify a gear selector switch concern.
- If the specified DTCs are set, repair them first. Refer to Diagnostic Trouble Code (DTC) List - Vehicle .
- Observe the HPCM IMS Range parameter display with a scan tool. The display should indicate Park or Neutral.
- If the display does not indicate Park or Neutral, adjust the range selector lever cable. Refer to Range Selector Lever Cable Adjustment .
- Verify that serial data gateway module (SDGM) DTC B009F is not set.
- If B009F is set, refer to DTC B009F .
- Observe the SDGM Hybrid Crash Status parameter. If the vehicle has not been involved in a collision the parameter should display No Crash.
- If the parameter displays Crash Detected and/or the vehicle has been involved in a collision the high voltage system should be inspected for damage and the high voltage system re-enabled. Refer to High Voltage System Inspection .
- Verify the vehicle has not been in a collision that resulted in supplemental inflatable restrain (SIR) deployment.
- If SIR deployment has occured the high voltage system should be inspected for damage and the high voltage system re-enabled. Refer to High Voltage System Inspection .
- Observe the BECM Hybrid Battery Pack Calculated voltage parameter with a scan tool. You should observe greater than 230 volts.
- If the hybrid battery voltage is less than the specified value, attempt to charge the Hybrid Battery. Refer to Jump Assist .
- Turn the ignition to Crank. The engine should instantly start and run.
- If the engine does not crank but audible transmission noise is observed while cranking, inspect the transmission for internal component failure. A seized engine or accessory drive could cause transmission damage during engine crank.
- If the engine does not crank and no audible transmission noise is observed replace the drive motor generator power inverter module (PIM).
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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.