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 MANUALSCHEVROLET2009TAHOE BASE, 4.8 CREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 428 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0C4ECOMPONENT TESTING
2009 Chevrolet Tahoe Base, 4.8 C
Component Testing
2009 Chevrolet Tahoe Base, 4.8 CSECTION Component Testing
WARNING: This page is about a different car, the 2011 GMC Yukon, 2011 Chevrolet Tahoe, and 2011 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 8 and the AC terminal 9.
- 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 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 M15A drive motor with generator assembly.
- Test for 20-23 Ξ© between the signal terminal 12 and the signal terminal 14.
- 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 M15A 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 M15A drive motor with generator assembly.
- Test for 23-26 Ξ© between the signal terminal 10 and the signal terminal 11.
- 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 M15A 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 M15A drive motor with generator assembly.
- Test for greater than 7 Ξ© between the terminals listed below and ground:
- Terminal 8
- Terminal 9
- Terminal 10
- Terminal 11
- Terminal 12
- Terminal 14
- 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 M15A drive motor with generator assembly.
- Test for infinite resistance between the terminals listed below:
- Terminals 8 and 10
- Terminals 8 and 12
- Terminals 10 and 12
- 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 M15A 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.