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P0125: Insufficient Coolant Temperature for Closed Loop Fuel Control
Severity: Low Usually safe to keep driving, but get it checked.
What does P0125 mean?
The engine is taking too long to warm up enough for normal fuel control.
Generic OBD-II definition: Insufficient Coolant Temperature for Closed Loop Fuel Control. Confirm applicability in your vehicle service information.
Common causes
- Thermostat stuck open
- Faulty coolant temperature sensor
- Low coolant
Symptoms
- Slow warm-up
- Weak cabin heat
- Poor fuel economy
Can I keep driving with P0125?
Severity: Low Usually safe to keep driving, but get it checked.
If the check engine light is flashing or the car runs badly, stop driving and have it checked.
Typical fixes
- Check coolant level
- Replace thermostat if stuck open
- Test ECT sensor