OBD-II code · Powertrain (generic)
P0D66 Hybrid/EV Battery Pack Cooling Fan Enable Circuit High
The HV battery pack cooling fan enable circuit reports a enable circuit high condition. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
Is it safe to drive with P0D66?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelyWire shorted to B+
- PossiblePull-down resistor open
- Less likelyConnector pins corroded - high contact resistance
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 0.5–3 h
- Emissions test
- Usually unaffected
- Parts involved
- Hv Battery Cooling Fan Enable, Wiring Harness, Bms
Related codes
- P0D63Hybrid/EV Battery Pack Cooling Fan 2 Sense Circuit Intermittent/Erratic
- P0D64Hybrid/EV Battery Pack Cooling Fan Enable Circuit/Open
- P0D65Hybrid/EV Battery Pack Cooling Fan Enable Circuit Low
- P0D67Battery Charger Control Module A Performance
- P0D68A/C Compressor Motor Voltage Sensor A Circuit
- P0D69A/C Compressor Motor Voltage Sensor A Performance
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.