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 P0C11-P0C16CIRCUIT/SYSTEM VERIFICATION
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6
Circuit/System Verification
2008 Chevrolet Chevy Express G2500, Van Cargo, 6.6 6SECTION Circuit/System Verification
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 ON, observe the scan tool ECM engine coolant temperature (ECT) parameter in freeze frame data. The reading should be below 125°C (257°F).
- If the ECT was above 125°C (257°F) when the DTC set, go to Symptoms - Engine Cooling and correct that concern first.
- Inspect for proper coolant level in the hybrid cooling system reservoir.
- If coolant level is low refer to Generator Control Module Cooling System Draining and Filling .
- Inspect the hybrid cooling system radiator for debris or obstruction.
- If a concern is found, repair or replace the restricted or damaged components as necessary.
- Inspect for proper operation of all hybrid system coolant pumps. Refer Hybrid Cooling System Overheating (Electrical)
.
- If a concern is found, repair or replace the coolant pumps as necessary.
- Command the cooling fans through all operating speeds.
- If the cooling fans do not operate in all speeds, refer to Cooling Fan Inoperative (without HP2) , Cooling Fan Inoperative (with HP2) .
- If the above inspections do not identify a concern, disassemble the T6 drive motor generator power inverter module and inspect the drive motor generator power inverter module cooling surface for excessive corrosion or contamination restriction. Refer to Drive Motor Generator Power Inverter Module Removal and Installation .
- If corrosion or contamination is found, clean the drive motor generator power inverter module cooling surface or replace the T6 drive motor generator power inverter module as necessary.
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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.