P0118Severity: Medium
P0118 – Engine Coolant Temperature (ECT) Sensor High Input
The ECT sensor reports a high (open-circuit) signal.
What it means
The coolant temperature sensor voltage is very high (reads too cold). If the engine seems permanently cold, the mixture richens.
Symptoms
- Check-engine light
- High fuel use
- Hard hot start
- Gauge reads cold
Common causes
- Open wiring
- Faulty ECT sensor
- Connector corrosion
- Low coolant
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Frequently asked questions
What does trouble code P0118 mean?
P0118 – Engine Coolant Temperature (ECT) Sensor High Input. The coolant temperature sensor voltage is very high (reads too cold). If the engine seems permanently cold, the mixture richens.
Can I drive with a P0118 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.