DTC P0128-00: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature); DTC P0128-07: Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature) Mechanical Failure [02/2019 - 06/2020]: Procedure
- CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0128-00 AND P0128-07)
- 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 the DTCs.
Powertrain > Engine > Trouble Codes
Result
Result Proceed to DTC P0128-00 or P0128-07 are output A DTC P0128-00 or P0128-07 and other DTCs are output B HINT:
If any DTCs other than P0128-00 or P0128-07 are output, troubleshoot those DTCs first.
Result:
B
GO TO DTC CHART
Refer to DIAGNOSTIC TROUBLE CODE CHART [02/2019 - 10/2019] , or refer to DIAGNOSTIC TROUBLE CODE CHART [10/2019 - 06/2020]
Result:
A
See step 2
- CHECK ENGINE COOLING SYSTEM
- 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.
Result
Proceed to OK NG
Result:
NG
REPAIR OR REPLACE ENGINE COOLING SYSTEM
Result:
OK
See step 3
- 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.
- INSPECT WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
- Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).
Refer to INSPECTION [11/2018 - 12/2021]
Result
Proceed to OK NG
Result:
NG
REPLACE WATER INLET WITH THERMOSTAT SUB-ASSEMBLY
Refer to REMOVAL [02/2019 - 10/2019] , or refer to REMOVAL [10/2019 - 08/2020]
Result:
OK
See step 4
- Inspect the water inlet with thermostat sub-assembly (thermostat opening temperature).
- INSPECT ENGINE COOLANT TEMPERATURE SENSOR
- Inspect the engine coolant temperature sensor.
Refer to INSPECTION [02/2019 - ]
HINT:
Perform "Inspection After Repair" after replacing the engine coolant temperature sensor.
Refer to INITIALIZATION [02/2019 - 10/2019] , or refer to INITIALIZATION [10/2019 - 08/2020]
Result
Result Proceed to OK (w/ Grille Shutter System) A OK (w/o Grille Shutter System) B NG C
Result:
B
REPLACE ECM
Refer to REMOVAL [02/2019 - 08/2020]
Result:
C
REPLACE ENGINE COOLANT TEMPERATURE SENSOR
Refer to REMOVAL [02/2019 - 08/2020]
Result:
A
See step 5
- Inspect the engine coolant temperature sensor.
- INSPECT NO. 2 ENGINE COOLANT TEMPERATURE SENSOR
- Inspect the No. 2 engine coolant temperature sensor.
Refer to PROCEDURE - Step 2
Result
Proceed to OK NG
Result:
OK
REPLACE ECM
Refer to REMOVAL [02/2019 - 08/2020]
Result:
NG
REPLACE NO. 2 ENGINE COOLANT TEMPERATURE SENSOR
Refer to REMOVAL [02/2019 - 08/2020]
- Inspect the No. 2 engine coolant temperature sensor.