Lost Communication With Hybrid/EV Battery Pack Coolant Pump A

Where it lives

For U0694, the description names the pump as the part involved.

Check these first

• Battery pack coolant pump A no longer answering on the bus
• A broken or shorted wire in the pump A control circuit
• Corrosion or coolant in the pump A connector
• A failed pump motor or driver inside pump A
• Loss of power or ground at coolant pump A

What to do next

1. Check for power and ground at battery pack coolant pump A
2. Inspect the pump A connector for corrosion or coolant
3. Test the pump A control wire for opens and shorts
4. Command pump A on with a scan tool and watch for a response
5. Replace the battery pack coolant pump A if it stays silent
6. Clear the code and retest

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