DTC P0128: Coolant Thermostat (Engine Coolant Temperature Below Thermostat Regulating Temperature): Trouble Symptom
WARNING: This page is about a different variant/trim than selected.
Thermostat remains open.
CAUTION:
After servicing or replacing faulty parts, perform Clear Memory Mode and Inspection Mode. Refer to
OPERATION and
PROCEDURE .
DIAGNOSTIC PROCEDURE
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK FOR ANY OTHER DTC ON DISPLAY. | Is any other DTC displayed? | Check the appropriate DTC using the "List of Diagnostic Trouble Code (DTC)". Refer to LIST OF DIAGNOSTIC TROUBLE CODE (DTC) . | Go to step 2 . |
| 2 CHECK ENGINE COOLANT. | Is the engine coolant amount normal? | Go to step 3 . | Refill the engine coolant. Refer to ENGINE COOLANT . |
3 CHECK RADIATOR FAN.
|
Does the radiator fan continuously rotate for 3 minutes or more during idling? | Repair radiator fan circuit. Refer to RADIATOR MAIN FAN AND FAN MOTOR and RADIATOR SUB FAN AND FAN MOTOR . | Replace the thermostat. Refer to THERMOSTAT . |