OBD codes / P0118
P0118
ModerateEngine Coolant Temperature (ECT) Sensor Circuit High
Get it looked at soon to avoid further wear.
Likely causes
- faulty ECT sensor
- open wiring
- low coolant
Common fixes
- replace the ECT sensor
- check coolant level and wiring
Seeing P0118 on your car? Get a diagnosis specific to your exact year, make and model.
Diagnose P0118 for my vehicleGeneric OBD-II reference. Manufacturer-specific behavior varies — confirm with a scan tool and, for safety-related codes, a professional inspection.