Hybrid/EV Battery Pack Coolant Pump A Control Circuit Low

Where it lives

For P0C48, the pump sits on the circuit this code reports. The description of P0C48 reports a fault at the pump.

Check these first

• Battery coolant pump A control circuit shorted to ground
• A failed pump A relay or corroded relay socket
• An open winding or seized pump A drawing no current
• Water in the pump A connector pulling the control line low
• A failed coolant pump control module driver

What to do next

1. Check for power and ground at battery coolant pump A
2. Test the pump A control wire for a short to ground
3. Inspect the pump A relay and socket for corrosion
4. Command pump A on with a scan tool and listen for it to run
5. Replace coolant pump A or its control module if it stays dead
6. Clear the code and retest

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