P0125Severity: Low
P0125 – Insufficient Coolant Temp for Closed Loop
The engine doesn't reach closed-loop temperature fast enough.
What it means
The ECU can't reach the temperature needed to enter closed-loop (precise fuel control) in time. Usually the thermostat or ECT sensor is the cause.
Symptoms
- Slow warm-up
- High fuel use
- Rough idle
Common causes
- Thermostat stuck open
- Faulty ECT sensor
- Low coolant
- Long idle in cold weather
With AutoMulti
AutoMulti reads this trouble code from your car in seconds, explains it in plain language with AI, lists the likely causes and helps you clear it when appropriate.
on theApp StoreSoonGet it onGoogle PlaySoon
Frequently asked questions
What does trouble code P0125 mean?
P0125 – Insufficient Coolant Temp for Closed Loop. The ECU can't reach the temperature needed to enter closed-loop (precise fuel control) in time. Usually the thermostat or ECT sensor is the cause.
Can I drive with a P0125 code?
It's usually not urgent, but finding and fixing the cause matters for emissions and fuel economy.