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 MANUALSCHEVROLET2006SUBURBAN K2500, 6.0 UREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 1942 (HYBRID/EV CONTROL SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESDTC P0C4FCIRCUIT/SYSTEM TESTING
2006 Chevrolet Suburban K2500, 6.0 U
Circuit/System Testing
2006 Chevrolet Suburban K2500, 6.0 USECTION Circuit/System 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.
- Verify that DTC P0A45, P0A46, P0C57, P0C58, P0C61, P0C62, or P1B04 are not set.
- If any of the DTCs are set, refer to DTC P0A45, P0A46, P0C57, P0C58, P0C61, P0C62, or P1B04Β .
- Ignition OFF, disconnect the X176 harness connector at the transmission.
- Install the DT-48493Β jumper harnessto 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 15 and 49
- Terminals 16 and 48
- Terminals 17 and 47
- Terminals 18 and 46
- Terminals 20 and 45
- Terminals 21 and 44
- If greater that the specified range, test the signal circuit for an open/high resistance.
- If all circuits test normal, replace the M15B 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.