How to handle the P0118 fault code?

1 Answers
OGeorge
07/29/25 3:56pm
Here are the methods to handle the P0118 fault code: 1. Move or shake the related wiring harness or connectors, and observe the sensor signal on the diagnostic tool or oscilloscope. 2. If the fault appears, there will be corresponding changes on the diagnostic tool, which can help determine the location of the intermittent fault. 3. If the sensor circuit is short-circuited to the battery positive voltage, both the ECM and the sensor may be damaged. Additional information: 1. Fault code P0118 applies to all car manufacturers. Chinese meaning: Engine Coolant Temperature (ECT) Sensor 1 Circuit High. English meaning: Engine-Coolant-Temperature-Sensor-1-Circuit-High. 2. Possible causes include: the sensor signal line is short-circuited to ground; the resistance is too small; the sensor is damaged. If the engine runs for 60 seconds, the coolant temperature is below -42.75°C, and the fault duration exceeds 2 seconds, it can be concluded that the coolant temperature sensor signal voltage is too high.
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