Hybrid/EV Battery Pack Cooling Fan 2 Sense Circuit/Open
What it means
The hybrid/EV battery pack cooling fan 2 sense circuit is open, meaning the module sees a broken or disconnected path. The fan moves air across the high-voltage battery pack to keep it within its working temperature.
Can I keep driving? Usually yes for a short, gentle trip, but heat can damage the battery or drive parts; if power drops or a warning shows, stop and get it checked. Do not open high-voltage (orange) cables or covers yourself; leave that to a trained technician.
What this part does
The battery cooling fan blows cabin or outside air across the high-voltage battery pack to keep its temperature in a safe range. The battery control system varies its speed depending on how warm the cells are during driving and charging. The battery is a high-voltage part, so work on it is for trained people. A faulty fan may cause a warning, louder or constant fan noise, or reduced power when the pack gets hot.
Common symptoms
What you'll notice
- Overheating of the hybrid/EV battery pack
- Reduced performance or power output
- Warning light illuminated
Common causes
Most likely first
- Faulty cooling fan sensor or wiring
- Malfunctioning cooling fan relay
- Defective hybrid/EV battery pack cooling fan motor
- Low coolant level or insufficient coolant circulation
- Faulty hybrid/EV battery pack cooling fan control module
How to diagnose & fix
Work through it in order
- Check the cooling fan 2 fuse and replace if necessary.
- Inspect the wiring and connections for any damage or loose connections.
- Test the cooling fan 2 sensor for proper functioning and replace if faulty.
- Verify the operation of the cooling fan 2 and repair or replace if it is malfunctioning.
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