What does code P0118 mean?
The ECU detects very high voltage from the coolant temperature sensor, interpreting extremely low engine temperature
OBD-II Code
P0118 — Engine Coolant Temperature Circuit High Input
The ECU detects very high voltage from the coolant temperature sensor, interpreting extremely low engine temperature
Common symptoms
- Increased fuel consumption
- engine takes long time to reach normal temperature
- poor heater performance
Possible causes
- Open circuit at sensor
- disconnected connector
- faulty ECT sensor
Initial recommendation
Check ECT connection and wiring, test sensor and replace if unresponsive.
Safety notice
This information is for guidance only and does not replace a physical vehicle inspection or diagnosis by a qualified mechanic. If the vehicle has severe power loss, smoke, a fuel odor, overheating, brake or steering problems, or any unsafe behavior, avoid driving it and seek professional inspection.
Analyze this code with MecaOBD
Use the app to combine code P0118 with your vehicle's actual symptoms for more complete diagnostic guidance.
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