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P0118: Engine Coolant Temperature Circuit High
Severity: Medium Drive gently and get it diagnosed soon.
What does P0118 mean?
The ECT sensor signal voltage is too high (the computer may think the engine is extremely cold).
Generic OBD-II definition: Engine Coolant Temperature Circuit High. Confirm applicability in your vehicle service information.
Common causes
- Unplugged or failed sensor
- Open wiring
Symptoms
- Rich running
- Black smoke
- Poor fuel economy
Can I keep driving with P0118?
Severity: Medium Drive gently and get it diagnosed soon.
If the check engine light is flashing or the car runs badly, stop driving and have it checked.
Typical fixes
- Check connector
- Inspect wiring
- Replace sensor