DTC P0125-00: Insufficient Coolant Temperature for Closed Loop Fuel Control [12/2021 - ]: Procedure

1. Read the DTCs.

   Powertrain > Engine > Trouble Codes 

   Result

   Result	Proceed to
   P0125-00 and other DTCs are output	A
   P0125-00 is output	B

   HINT: 

   If any DTCs other than P0125-00 are output, troubleshoot those DTCs first.

Result: 

A 

GO TO DTC CHART. Refer to  DIAGNOSTIC TROUBLE CODE CHART [12/2021 - 10/2023]  , or Refer to  DIAGNOSTIC TROUBLE CODE CHART [10/2023 - ] 

Result: 

B 

See step  2

1. Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).

   Refer to INSPECTION [12/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY. Refer to  REMOVAL [12/2021 - ] 

Result: 

OK 

See step  3

1. Check for defects in the engine cooling system that might cause the system to be too cold, such as abnormal cooling fan operation or any modifications.

   HINT: 

   Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.

   Refer to INITIALIZATION [12/2021 - ]

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE ENGINE COOLANT TEMPERATURE SENSOR. Refer to  REMOVAL [12/2021 - ] 

Result: 

NG 

REPAIR OR REPLACE ENGINE COOLING SYSTEM