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 <Ref. to
OPERATION , Clear Memory Mode.>, and Inspection Mode <Ref. to
PROCEDURE , Inspection Mode.>.
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)". <Ref. 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. <Ref. to ENGINE COOLANT .> |
3 CHECK RADIATOR FAN.
|
Does the radiator fan continuously rotate for 3 minutes or more during idling? | Repair radiator fan circuit. <Ref. to RADIATOR MAIN FAN AND FAN MOTOR .> <Ref. to RADIATOR SUB FAN AND FAN MOTOR .> | Replace the thermostat. <Ref. to THERMOSTAT .> |