P2DFC
Hybrid/EV Battery Coolant Leak Detected
The hybrid control module detects a coolant leak in the HV battery thermal loop. Coolant level dropping or leak sensor triggered.
- 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.
- Coolant fitting loose or crackedCommon
- Coolant hose splitPossible
- Pack cell imbalance approaching service thresholdLess likely
Parts involved
- Hybrid Battery Coolant Loop
- Hybrid Battery Coolant Level Sensor
P2DFC 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.