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 P0C4FCOMPONENT TESTING
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Component Testing
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Component 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.
- Ignition OFF, disconnect the X176 harness connector at the transmission.
- Install the DT-48493Β jumper harness to the transmission side only.
- Test for 7.0-9.0 Ξ© between the AC terminal 15 and the AC terminal 16.
- If less than the specified range, test the transmission control wiring harness extension harness circuits for a short between the AC circuits. If the circuits test normal replace the M15B drive motor with generator assembly.
- If greater than the specified range, test each transmission control wiring harness extension harness AC circuits for an open. If the circuits test normal replace the M15B drive motor with generator assembly.
- Test for 20-23 Ξ© between the signal terminal 20 and the signal terminal 21.
- If less than the specified range, test the transmission control wiring harness extension harness circuits for a short between the signal circuits. If the circuits test normal replace the M15B drive motor with generator assembly.
- If greater than the specified range, test each transmission control wiring harness extension harness signal circuits for an open. If the circuits test normal replace the M15B drive motor with generator assembly.
- Test for 23-26 Ξ© between the signal terminal 17 and the signal terminal 18.
- If less than the specified range, test the transmission control wiring harness extension harness circuits for a short between the signal circuits. If the circuits test normal replace the M15B drive motor with generator assembly.
- If greater than the specified range, test each transmission control wiring harness extension harness signal circuits for an open. If the circuits test normal replace the M15B drive motor with generator assembly.
- Test for greater than 7 Ξ© between the terminals listed below and ground:
- Terminal 15
- Terminal 16
- Terminal 17
- Terminal 18
- Terminal 20
- Terminal 21
- If less that the specified value, test the transmission control wiring harness extension harness circuit for a short to ground. If the circuit tests normal replace the M15B drive motor with generator assembly.
- Test for infinite resistance between the terminals listed below:
- Terminals 15 and 17
- Terminals 15 and 20
- Terminals 17 and 20
- If less that the specified value, test the transmission control wiring harness extension harness circuits for a short between the circuits. If the circuits test normal replace the M15B drive motor with generator assembly.
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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.