What it means
The HV battery pack cooling fan 3 reports a performance/stuck off condition. Battery thermal management is impaired.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Battery cooling fan 3 moves air through the hybrid or EV battery pack when cooling is needed. The control system checks whether the fan responds to its command; this code sets when fan 3 is commanded on but does not operate as expected or appears stuck off.
Common causes
Most likely first.
- Fan motor seized
- Fan relay failed
- Carbon or debris buildup preventing free movement
Symptoms
- EV/hybrid system warning light on
- Reduced power output or limp mode
- Charging may fail or be slowed
- Reduced electric range
How to diagnose it
- Review freeze-frame data and live fan command and battery temperature readings to confirm when fan 3 should have been running.
- Inspect the fan 3 air path and accessible fan area for debris or obstruction, without entering the high-voltage battery enclosure.
- Check the fan 3 connector, wiring, and relay or control circuit for damage or a failed connection.
- Following the manufacturer's procedure, verify whether fan 3 receives its command and whether the motor turns freely.
- If the fan, air path, and circuit pass, check the fan control module and related battery cooling codes.
Common fixes
- Remove accessible debris obstructing fan 3 or its air path.
- Repair a loose or damaged fan 3 connector or wire.
- Replace a failed fan relay or control component.
- Replace fan 3 if its motor is seized or fails testing.
Can I keep driving?
Avoid fast charging, heavy loads, and prolonged demanding driving because a fan that stays off can let the battery pack overheat. Stop safely if a battery temperature warning appears or power drops sharply, and arrange prompt repair.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.