Insufficient Coolant Temperature for Closed Loop
Engine · Cooling System
The engine is taking too long to reach closed-loop fuel control temperature. Usually means the thermostat is stuck open, keeping the engine too cool. A cold-running engine burns more fuel and wears faster.
- Thermostat stuck openMost common
- Faulty coolant temp sensorCommon
- Low coolant levelLess common
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Frequently asked questions
What does P0125 mean?
The engine is taking too long to reach closed-loop fuel control temperature. Usually means the thermostat is stuck open, keeping the engine too cool. A cold-running engine burns more fuel and wears faster.
Is P0125 serious?
Fix soon — engine is not reaching operating temperature.
How much does it cost to fix P0125?
Repair costs for P0125 range from $150 – $400 depending on the root cause and your vehicle.
Can I drive with P0125?
You can drive short distances but should have it repaired within 1-2 weeks to prevent further damage.