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 2593 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0C4ECIRCUIT/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 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
- Verify that DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03 are not set.
- If any of the DTCs are set, refer to DTC P0A3F, P0A40, P0C52, P0C53, P0C5C, P0C5D, or P1B03Β .
- Ignition OFF, disconnect the X176 harness connector at the transmission.
- Install the DT-48493Β jumper harness to the harness side only.
- Disconnect the X1 harness connector at the T6 drive motor generator power inverter module.
- Test for less than 1 Ξ© between the terminals listed below:
- Terminals 8 and 56
- Terminals 9 and 55
- Terminals 10 and 54
- Terminals 11 and 53
- Terminals 12 and 52
- Terminals 14 and 51
- If greater that the specified range, test the signal circuit for an open/high resistance.
- If all circuits test normal, replace the M15A drive motor with generator assembly.
NOTE:
You must perform the Component Testing before proceeding with Circuit/System Testing.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.