Lost Communication With Hybrid/EV Battery Pack Coolant Control Valve B

Where it lives

For U0637, the description names the valve as the part involved.

Check these first

• The network drops the hybrid battery pack coolant control valve B
• An open circuit feeding control valve B
• A corroded connector at valve B
• A frozen or carboned valve B
• A failed control valve B actuator

What to do next

1. Scan for the battery coolant control valve B module
2. Inspect the valve B connector and wiring
3. Check power and ground at the actuator
4. Command valve B and watch for movement
5. Replace the battery pack coolant control valve B if it stays offline
6. Clear the code and retest

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