Coolant Temperature Below Thermostat Regulating Temperature
Your engine has not reached its operating temperature in the correct time.
You will likely not notice any drivability problems other than the SES light.
- Low engine coolant level
- Leaking or stuck open thermostat
- Cooling fan (running too much)On all the time
- Defective coolant temperature (ECT) sensor
- Defective intake air temperature (IAT) sensor