The computer has recorded an engine temperature above its limit. The driver may see the gauge high or a warning light and the engine may reduce power.
Likely causes, most common first
- Low coolant level or leak
- Cooling fan not working
- Thermostat stuck closed or failing water pump
- Blocked radiator
Parts usually involved
- Thermostat
- Water pump
- Radiator
- Cooling fan
Test before you replace
Check the coolant level and fan operation with the engine cool first, then pressure test the system and check for head gasket signs.
General guidance for generic OBD2 codes. Always follow the maker's procedure for the car in front of you.