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 Refer to
, OPERATION , Clear Memory Mode., and Inspection Mode Refer to
, PROCEDURE , Inspection Mode..
| Step | Check | Yes | No |
|---|---|---|---|
| 1 CHECK ENGINE COOLANT. | Is the engine coolant amount normal? | Go to step 2 . | Refill the engine coolant. Refer to ENGINE COOLANT Engine Coolant. |
2 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 Radiator Main Fan and Fan Motor. and Refer to RADIATOR SUB FAN AND FAN MOTOR Radiator Sub Fan and Fan Motor. | Replace the thermostat. Refer to THERMOSTAT Thermostat. |