OBD-II code · Powertrain (generic)
P0BC9 Hybrid/EV Battery Pack Cooling Fan 1 Sense Circuit Low
The HV battery pack cooling fan 1 sense circuit reports a sense circuit low fault. Fan speed feedback is unreliable.
Is it safe to drive with P0BC9?
The car may go into limp mode (reduced power). Get it diagnosed before a long trip.
Common causes
- Most likelySense wire shorted to ground
- PossibleTachometer internal short
- 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 1 Sense, Wiring Harness, Bms
Related codes
- P0BC6Hybrid/EV Battery Temperature Sensor E Circuit Intermittent/Erratic
- P0BC7Hybrid/EV Battery Pack Cooling Fan 1 Sense Circuit/Open
- P0BC8Hybrid/EV Battery Pack Cooling Fan 1 Sense Range/Performance
- P0BCAHybrid/EV Battery Pack Cooling Fan 1 Sense Circuit High
- P0BCBHybrid/EV Battery Pack Cooling Fan 1 Sense Circuit Intermittent/Erratic
- P0BCCGenerator Inverter Temperature Sensor A Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.