Hybrid/EV Battery Pack Coolant Pump A Performance

Where it lives

For P2B28, the part to look at first is the pump named here.

Check these first

• A battery pack coolant pump A that is weak or stuck
• Low coolant in the battery pack loop
• An air lock stopping coolant flow through the pack
• A pump control or power circuit fault

What to do next

1. Check the battery pack coolant level and condition
2. Command coolant pump A with a scan tool and listen for it
3. Bleed air from the coolant loop and verify flow
4. Check the pump feed, ground and control signal
5. Replace the coolant pump A if it will not run or move enough flow
6. Clear the code and retest

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