When you turn the key in your car, the crankshaft position sensor tells the engine control module (ECM) how far the piston is from top dead center. If the sensor detects a problem with the crankshaft – for example, if it’s not moving due to a broken part – the ECM will disable fuel and air to the engine, preventing it from starting. While this safety system is important, it can sometimes malfunction. That’s where a crankshaft position sensor replacement might come in handy. If your car’s ECM detects that the sensor has failed, your car will still start – but it might take longer than usual, and you might have to use more effort than usual to get it started.
What is a Crankshaft Position Sensor?
A Crankshaft Position Sensor (CKP) is a device that detects the position of the crankshaft on an engine. It signals the electronic control unit (ECU) to change the fuel and air mixture, or to activate the ignition system. If the crankshaft position sensor fails, the car will not start.
What Causes a Crankshaft Position Sensor to Fail?
If your car won’t start, there’s a good chance that the crankshaft position sensor is malfunctioning. If the sensor detects an incorrect crankshaft position, the car’s computer will disable the engine’s ignition coil to avoid starting afire. In some cases, a failed sensor can also cause a false positive reading that causes the car to turn off in mid-drive. If you experience these symptoms, it’s important to have your car scanned by a mechanic to determine if the crankshaft sensor is the root cause.
How Can You Fix a Crankshaft Position Sensor?
If your car won’t start, check to see if the crankshaft position sensor is plugged in. If it is plugged in and the car still won’t start, try disconnecting the sensor and plugging it back in. If that doesn’t work, you’ll need to replace the sensor.
Conclusion
A crankshaft position sensor is designed to monitor the engine’s crank and camshaft positions in order to prevent damage that can occur as a result of incorrect or mismatched gear ratios. If your car’s battery is low or if there is some other type of obstruction preventing the sensor from working, the car may not be able to start. In this case, you would need to jumpstart the vehicle in order to get it running again.