P2CF3
Hybrid/EV Battery Pack Coolant Pump A Underspeed
The HV battery pack coolant pump A runs below the calibrated minimum speed for the commanded duty. Mechanical resistance high, supply voltage low, or pump aged.
- 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.
- Mechanical load increased (binding)Common
- Supply voltage low under loadPossible
- Pack cell imbalance approaching service thresholdLess likely
Parts involved
- Hybrid Battery Coolant Pump A
- Battery Pack Coolant Loop
P2CF3 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.