OBD-II / P0128
Coolant temperature below regulating temperature
The engine takes longer than expected to reach operating temperature according to the control module.
Possible causes
- 01Thermostat stuck open
- 02Incorrect temperature sensor
- 03Low coolant level
- 04Cooling fan running at the wrong time
Safe checks
- Check coolant level only when cold.
- Notice whether cabin heat takes unusually long.
- Compare cold-start temperature with ambient temperature.
Не заменяет диагностику в сервисе. Сначала помогает понять ситуацию и принять решение. Original editorial content; always confirm manufacturer procedures and specifications.