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

Where it lives

For P0C4B, the pump sits on the circuit this code reports. The description of P0C4B reports the pump as open.

Check these first

• An open in the battery pack coolant pump A supply wiring
• A short in the pump A supply wiring
• Corrosion or damage in the pump A supply connector
• 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. Test the pump A supply wiring for an open or short
3. Inspect the pump A supply connector for corrosion
4. Test the pump A motor for a fault
5. Replace the battery management module if the circuit tests good
6. Clear the code and retest

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