![]() Sometimes, a faulty sensor sends a permanent cold signal to the engine, causing the engine to overheat. If your engine is overheating, it could be a faulty coolant temperature sensor. You may also want to check out our article on how to fix engine misfires. This problem has to be solved on time to avoid irreparable damage to the engine. The problem of engine misfire can be caused by a bad coolant temperature sensor. If the engine of your car has been misfiring recently, it is time you should have it investigated by a mechanic. The ECM then uses this information to adjust the fuel ratio, ignition timing, etc. The sensor is used to measure the temperature of the coolant and send it to the ECM. Engine misfireĪ bad engine coolant temperature sensor can have a huge effect on your car’s performance. If you’ve noticed that your car’s exhaust pipe is producing black smoke anytime you accelerate, then it’s probably a good idea to have its coolant temperature sensor checked out as soon as possible. The black smoke is a result of an overly rich air-fuel mix in the engine caused by incorrect sensor readings. If the engine does start, you may notice heavy black smoke from your tailpipe. Black smoke from the exhaustĪ faulty coolant temperature sensor can prevent the engine from starting, but in other cases, the engine will start, but then it may crank too fast or too slow. 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.P0115 Code: Engine Coolant Temperature Sensor Circuit Malfunction.Here are some of the most common diagnostic trouble codes (DTC) for “Engine Coolant Temperature (ECT) problems: This code triggers the Check Engine warning light on the dashboard. ![]() A bad or malfunctioning thermostat will result in a trouble code generated by the computer system. If the computer senses that the engine is overheating it will show a check engine light. The sensors measure how hot the engine is running and if it’s close to overheating.
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