What is the P0118 error code?

The control module monitors the return signal from the thermistor-based sensor, where high resistance typically corresponds to high voltage on the reference circuit. This DTC sets when the signal voltage remains above a manufacturer-dependent threshold for a calibrated duration, suggesting an electrical open or high-resistance fault. The evaluation window is generally continuous while the ignition is in the run position to ensure constant signal integrity.

What does P0118 mean?

This code indicates that the engine control module perceives an extremely high resistance in the coolant temperature circuit, which it typically interprets as an extremely cold engine state. Consequently, the vehicle may exhibit poor fuel economy or difficulty starting in various conditions due to incorrect fuel enrichment calculations. In many instances, the system may trigger high-speed cooling fan operation as a protective measure against potential overheating during a signal loss event.

System Faults

Diagnostic Reasoning

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