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HOMESERVICE MANUALSSUBARU2022IMPREZA BASE, 4D SEDAN, AUTOMATIC CVT TRANSREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 27 (ENGINE CONTROL SYSTEM (HEV) (DIAGNOSTICS) (1 OF 4))DIAGNOSTIC PROCEDURE WITH DIAGNOSTIC TROUBLE CODE (DTC)DTC P0125: INSUFFICIENT COOLANT TEMPERATURE FOR CLOSED LOOP FUEL CONTROLNOTES
2022 Subaru Impreza Base, 4D Sedan, Automatic CVT Trans

DTC P0125: Insufficient Coolant Temperature For Closed Loop Fuel Control: Notes

2022 Subaru Impreza Base, 4D Sedan, Automatic CVT TransSECTION Notes
WARNING: This page is about a different car, the 2022 Subaru Crosstrek. However, it is still accessible from the selected car via links, so may be relevant.

1. - 

DTC detecting condition: 

Detected when two consecutive driving cycles with fault occur.

Trouble symptom: 

Engine does not return to idle

NOTE:

After the faulty parts are repaired or replaced, perform the final check in Basic Diagnostic Procedure. Ref. to  ENGINE (DIAGNOSTICS) (H4DO(HEV))>BASIC DIAGNOSTIC PROCEDURE>PROCEDURE  . 

  1. CHECK DTC  .
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC other than P0125 displayed? (Current code)

    Yes:  Check the appropriate DTC using the "Diagnostic Trouble Code (DTC)". Ref. to ENGINE (DIAGNOSTICS) (H4DO(HEV))>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    No:  Go to  2.

  2. CHECK THERMOSTAT  .

    Check the following items:

    • Amount of engine coolant
    • Engine coolant freeze
    • Contamination of engine coolant

    Is the check result OK?

    Yes:  Go to  3

    No:  Fill or replace the engine coolant. Ref. to COOLING(H4DO(HEV))>ENGINE COOLANT>REPLACEMENT .

  3. CHECK THERMOSTAT 

    Check the thermostat. Ref. to COOLING(H4DO(HEV))>THERMOSTAT>INSPECTION .

    Does the thermostat remain opened?

    Yes:  Replace the thermostat. Ref. to THERMOSTAT .

    No:  Go to  4.

  4. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Check the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR .

    Is the check result OK?

    Yes:  Go to  5.

    No:  Replace the engine coolant temperature sensor. Ref. to ENGINE COOLANT TEMPERATURE SENSOR .

  5. CHECK DTC 
    1. Turn the ignition switch to ON.
    2. Using the Subaru Select Monitor or a general scan tool, perform the clear memory of [Engine]. Ref. to COMMON (DIAGNOSTICS)>CLEAR MEMORY .
    3. Using the Subaru Select Monitor or a general scan tool, read the DTC of [Engine]. Ref. to COMMON (DIAGNOSTICS)>DIAGNOSTIC TROUBLE CODE (DTC) .

    Is DTC for [Engine] displayed?

    Yes:  Check the connection of connector. If there is no faulty connector, perform the diagnosis for the displayed DTCs. Ref. to ENGINE (DIAGNOSTICS) (H4DO(HEV))>DIAGNOSTIC TROUBLE CODE (DTC)>LIST .

    NOTE:

    After the concerned inspection step is performed, the final check in Basic Diagnostic Procedure is not necessary. 

    No:  Finish the diagnosis.

    NOTE:

    After the concerned inspection step is performed, the final check in Basic Diagnostic Procedure is not necessary. 

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.