P0BBF
Hybrid/EV Battery Pack Cooling Fan Supply Voltage Circuit/Open
Generic OBD-II
Common symptoms
What you'll notice
- Check and repair any loose or damaged wiring or connections related to the hybrid/EV battery pack cooling fan supply voltage circuit.
- Inspect and replace any faulty fuses or relays associated with the cooling fan circuit.
- Verify and fix any issues with the cooling fan control module or its wiring.
- Perform a diagnostic test on the battery pack cooling fan motor and replace if necessary.
- If all previous steps fail, consider replacing the hybrid/EV battery pack cooling fan itself as a last resort.
Common causes
Most likely first
- Faulty cooling fan relay
- Defective cooling fan motor
- Wiring issue or loose connection in the cooling fan circuit
- Blown fuse or circuit breaker related to the cooling fan
- Malfunctioning cooling fan control module or sensor
How to diagnose & fix
Work through it in order
- Hybrid/EV battery pack overheating
- Lack of power or acceleration
- Increased fuel consumption
- Dashboard warning light illuminating
Read & clear P0BBF yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.