P0C4A
Hybrid/EV Battery Pack Coolant Pump A Control Performance
The HV battery pack coolant pump A reports a control performance condition. Battery thermal management may be impaired.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: hard
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Common causes
Ordered by how often each turns out to be the cause.
- Pump output degradedCommon
- Air pocket in coolant loopPossible
- Pack cell imbalance approaching service thresholdLess likely
Parts involved
- Hv Battery Pack Coolant Pump A
- Wiring Harness
- Bms
P0C4A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.