Check the coolant level and top it off if low
Inspect for coolant leaks in hoses, radiator, water pump, thermostat housing, and reservoir
Verify the thermostat is not stuck open and replace it if needed
Confirm the engine coolant temperature sensor is working correctly
Check the coolant temperature reading with a scan tool
Replace the engine coolant temperature sensor if readings are inaccurate
Inspect the radiator fan operation and fan relay
Make sure the cooling system is properly bled of air
Replace the radiator cap if it is not holding pressure
Check for a clogged radiator or restricted coolant flow
Replace damaged hoses or collapsed hoses
Clear the code after repairs and test drive the vehicle
Recheck for returning codes and confirm normal engine operating temperature