What does code P0118 mean?

Q: What does code P0118 mean?

Engine Coolant Temperature Circuit High Input. P0118 means the engine computer has seen a voltage from the engine coolant temperature (ECT) sensor that is higher than the normal range for the current conditions, which it interprets as an excessively high coolant temperature signal. The computer compares the sensor's voltage to expected values and flags the circuit as a high input fault when the signal stays above the calibrated threshold.

DTC codes / P01xx · Fuel and air metering / P0118

P0118Engine Coolant Temperature Circuit High Input

P0118 means the engine computer has seen a voltage from the engine coolant temperature (ECT) sensor that is higher than the normal range for the current conditions, which it interprets as an excessively high coolant temperature signal. The computer compares the sensor's voltage to expected values and flags the circuit as a high input fault when the signal stays above the calibrated threshold.

SystemPowertrain

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.