P0125 – Insufficient Coolant Temperature For Closed Loop Fuel Control

P0125 – Insufficient Coolant Temperature For Closed Loop Fuel Control
Description:                 Indicates the engine coolant temperature (ECT) or the cylinder head temperature (CHT) sensor has not achieved the required temperature level to enter closed loop operating conditions within a specified amount of time after starting the engine.
Possible Causes:       
 
Insufficient warm up time
Low engine coolant level
 
Leaking or stuck open thermostat
Damaged ECT sensor
Damaged CHT sensor
Diagnostic Aids:  Compare the thermostat specification to the actual ECT using the engine temperature PID (ECT or CHT). The temperature reading should be similar when the engine is at a normal operating temperature.
Related Topics  P0121 - Throttle/Pedal Position Sensor A Circuit Range/Performance

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