P0128

P0128

Blocked Thermostat - Signal Implausible

Diagnosis conditions
- Engine starting temperature between -10 °C and +45 °C
- Idle speed

Possible fault cause

NOTE:
- Fault PO128 is only stored in conjunction with fault P0116 (Engine temperature).
- If the coolant shutoff valve or the transmission oil temperature sensor are stored, remedy the fault first.

- Open coolant control
- Open coolant shutoff valve

Diagnosis/Troubleshooting