![]() If the sensor fails, it may also fail in a way that sends a signal that is always high or low, which can cause the same types of problems. If this happens, it can cause the engine to not run as well or at all. When the computer doesn’t receive accurate information, it may not be able to use its fuel or timing control functions properly. The sensor monitors the temperature of the coolant and sends this information to the computer. If the car temperature gauge goes up and down randomly, it can be a sign that you have a bad engine coolant temperature sensor. But many other things could be wrong with your car, too. The combination of these factors will drastically affect your gas mileage. The result of this is that the engine will run rich (too much fuel) and will not warm up as quickly as it should. When you have a failed coolant temperature sensor it can send a permanently cold signal to the PCM (Powertrain Control Module). It also shortens the spark duration, so less fuel is burned. As the engine warms up and the coolant temperature sensor senses a temperature rise it sends a signal to the PCM to reduce the amount of fuel delivered for each pulse. When the engine is cold, there is more fuel delivered and longer spark duration. Poor fuel mileage can be a symptom of the bad coolant temperature sensor. This could be caused by a bad sensor or wiring in the harness. It may not be bad, but just reading wrong. If the coolant sensor is working, but it is out of range, it will not set any codes. You’ll have to check this with a scan tool if your vehicle has one or wait for a code to set to see if there is an issue with this sensor. The opposite may happen if it read cold all the time when it should be reading hot. If the engine is cold and the sensor reads hot, the computer adjusts its fuel delivery accordingly and you may experience stumble, hesitation, and rough idle at startup. You can check the latest price on Amazon. We found the Innova 5610 scan toolset to be a worthwhile investment for any DIY enthusiast. P0118 Code: Engine Coolant Temperature Circuit High InputĬode readers and scanners can pinpoint an issue with your vehicle without having to take it to an expensive mechanic.P0117 Code: Engine Coolant Temperature Sensor 1 Circuit Low. ![]()
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