P0118 on BMW — Engine Coolant Temperature Circuit High Input
BMW
Verified1 source
1 source
- Official data (NHTSA)official_feed
What P0118 means
Caution — monitor closely
The ECU sees an abnormally high voltage from the coolant temperature sensor — often reads as "engine always cold".
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General information, not a diagnosis or repair instruction. Always confirm with a qualified mechanic for your specific vehicle.
Common causes
- Faulty ECT sensor or its wiring
Symptoms
- Повышенный расход топлива
- Cooling fan runs constantly
- Reduced fuel economy
- Increased fuel consumption
What to check first
- Inspect ECT sensor wiring
- Test sensor resistance at known temperature
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