P0125
Insufficient Coolant Temperature for Closed Loop Fuel Control
2014-2021 BMW i3 Range Extender
Moderate SeverityPowertrainGeneric (SAE)
Description
The engine is not reaching normal operating temperature quickly enough for the PCM to enter closed-loop fuel control.
Symptoms
- Check Engine Light
- Poor fuel economy
- Extended warmup time
- Rich exhaust smell
Common Causes
- Stuck-open thermostat
- Faulty ECT sensor
- Cooling fan running constantly
- Low coolant level
Diagnostic Steps
- Monitor ECT warmup time (should reach 160°F within 5-10 min)
- Test thermostat
- Check cooling fan operation
- Test ECT sensor
Repair Notes
Replace thermostat. Most common cause.
Related Codes
Other Powertrain Codes
- P0070Ambient Air Temperature Sensor Circuit
- P0071Ambient Air Temperature Sensor Range/Performance
- P0072Ambient Air Temperature Sensor Circuit Low
- P0073Ambient Air Temperature Sensor Circuit High
- P0115Engine Coolant Temperature (ECT) Sensor 1 Circuit
- P0116ECT Sensor 1 Circuit Range/Performance
- P0117ECT Sensor 1 Circuit Low Input
- P0118ECT Sensor 1 Circuit High Input
- P0119ECT Sensor 1 Circuit Intermittent
- P0128Coolant Thermostat Below Regulating Temperature
P0125 on Other Vehicles
Common Questions
What does code P0125 mean on a 2014-2021 BMW i3?
P0125 stands for "Insufficient Coolant Temperature for Closed Loop Fuel Control". The engine is not reaching normal operating temperature quickly enough for the PCM to enter closed-loop fuel control.
What are the symptoms of P0125 on a BMW i3?
Common symptoms of P0125 include: Check Engine Light, Poor fuel economy, Extended warmup time, Rich exhaust smell.
What causes P0125 on a 2014-2021 BMW i3?
Common causes of P0125 include: Stuck-open thermostat, Faulty ECT sensor, Cooling fan running constantly, Low coolant level.