Hybrid/EV Battery Pack Coolant Pump A Supply Voltage Circuit Low

Where it lives

For P0C4C, the circuit described runs through the pump. The description of P0C4C reports a fault at the pump.

Check these first

• A battery pack coolant pump A supply voltage below its normal range
• Low battery voltage at the pump A supply
• Corrosion or a loose connection in the pump A wiring
• A failed battery pack coolant pump A motor

What to do next

1. Read battery pack coolant pump A supply voltage on a scan tool
2. Check battery voltage and charging
3. Test the pump A supply wiring for added resistance
4. Inspect the pump A connectors for corrosion
5. Replace battery pack coolant pump A if the circuit tests good
6. Clear the code and retest

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