DTC P0128: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) [03/2012 - 05/2013]: Procedure
- CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128)
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine / Trouble Codes.
- Read DTCs.RESULT
Result Proceed to DTC P0128 is output A DTC P0128 and other DTCs are output B HINT:
If any DTCs other than P0128 are output, troubleshoot those DTCs first.
B → See step 4
A: Go to next step
- CHECK COOLING SYSTEM
- Check for defects in the cooling system that might cause the system to be too cold, such as abnormal cooling fan operation or any modifications.
NG → REPAIR OR REPLACE COOLING SYSTEM
OK: Go to next step
- INSPECT THERMOSTAT
- Inspect the thermostat (thermostat opening temperature). Refer to INSPECTION [03/2012 - ] .
NG → See step 5
OK → See step 6
- GO TO DTC CHART. Refer to DIAGNOSTIC TROUBLE CODE CHART [03/2012 - 05/2013]
- REPLACE THERMOSTAT. Refer to REMOVAL [03/2012 - ]
- REPLACE ECM. Refer to REMOVAL [03/2012 - 05/2013]