Powertrain
generic / SAE
P0125
Insufficient Coolant Temperature for Closed Loop Fuel Control
The engine has run long enough that closed-loop fuel control should be active, but the coolant temperature has not risen high enough. Often caused by a stuck-open thermostat or a failed coolant temperature sensor.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number1 / 25
Possible causes
- Thermostat stuck open high
- Coolant temp sensor reading low medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 80–400 €
- Estimated time: 0.5–2.5 h
- Component: thermostat
- Component: coolant temperature sensor
- MIL / check engine light
- emissions-relevant
- drive cycle required
Sources
References
sae:J2012