The P0118 trouble code indicates a high input issue within the engine coolant temperature (ECT) sensor circuit. This code typically points to problems with the sensor responsible for measuring the temperature of the engine coolant, affecting the engine’s performance and fuel efficiency.
Engine Coolant Temperature Circuit High Input
Code symptoms P0118.
1. Engine running cooler than usual.
2. Poor fuel efficiency.
3. Malfunction indicator light (MIL) illumination.
This code is common in brands such as:: Chevrolet, Renault, Ford, Toyota, Nissan, Mercedes Benz, Honda.
Causes of the code P0118.
1. Faulty engine coolant temperature sensor.
2. High input or voltage within the sensor circuit.
3. Problems with the Engine Control Module (ECM).
Code Solutions P0118.
1. Inspect and replace the engine coolant temperature sensor if it is faulty.
2. Check and repair any high input or voltage issues in the sensor circuit.
3. If ECM issues are suspected, consult a qualified technician for diagnosis and potential reprogramming or replacement.