P1118
Engine Coolant Temp Signal Out-Of Range High
Severity
⚠️ MediumCan you drive?
Limited driving only, diagnose soon
Approx. repair cost
$6–33 (est.)
Symptoms
- Incorrect temperature readings on the dashboard
- Engine overheating
- Increased fuel consumption
- Unstable engine idling
- Difficulty starting the engine
Causes
- Coolant temperature sensor malfunction
- Open or short circuit in the sensor circuit
- Poor contact in sensor connectors
- Problems with the ECU
- Low coolant level
How to Fix
- Check the level and condition of the coolant
- Check the integrity of the sensor wires and connectors
- Test coolant temperature sensor (resistance)
- Replace the coolant temperature sensor if necessary
- Check error codes after repair and make sure they are absent