How A Crankshaft Position Sensor Works

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The crankshaft position sensor, or CKP sensor, is an essential part of the engine control unit (ECM). It tells the ECM where the cylinders are and how fast they’re spinning. CKP sensors come in a variety of types, including inductive and Hall effect sensors. Regardless of type, they are mounted near a toothed reluctor ring or reluctor wheel.


When a crankshaft position sensor is malfunctioning, it will not be providing the PCM (Engine Control Unit) with accurate data about the piston position. This can lead to a misfire inside one or more of the chamber cylinders. If you notice a problem like this, it is important to have it repaired as soon as possible so that your engine does not suffer any further damage. Getting the faulty crankshaft position sensor replaced as soon as you spot this issue will ensure that your vehicle does not experience any further issues down the road.

A faulty crankshaft position sensor can also lead to reduced engine performance. This is because it will send inaccurate readings to the ECM, which may not optimize timing or use incorrect values. Symptoms of a failing crankshaft position sensor include problems starting the vehicle, a Check Engine Light coming on, and intermittent stalling or misfiring. A faulty crankshaft position sensor can be a sign of a broader engine issue, so make sure you consult with a qualified mechanic to get it checked out and repaired before the problem worsens.


The crankshaft position sensor (CPS) is a critical component for your engine to operate. It measures the crankshaft’s rotational speed and position and sends a report to the engine control unit to help it make proper adjustments in your fuel injection and ignition systems. When the CPS sends inaccurate signals to your engine control unit, it can cause a number of problems that can affect your vehicle’s performance. These include misfires, uneven acceleration and a drop in fuel efficiency. If you notice any of these issues, it’s important to have the problem diagnosed by a mechanic as soon as possible.

One of the most obvious signs that you may need to replace your crankshaft position sensor is difficulty starting the car. This can be a sign that the wiring in the sensor is loose or that there is an electrical short in the wires near the sensor.


When your crankshaft position sensor goes bad, you need to get it fixed right away. This is because it determines the engine’s speed, allowing the computer to time ignition and fuel injection. The sensor is made up of a coil of wire and a magnet that captures a tiny electrical current as the crankshaft rotates. This information is relayed to the ECU and used to control the timing of the ignition and fuel injection.

If the sensor fails, it won’t send accurate information to the computer, causing the vehicle to misfire or stall. Other problems can include reduced gas mileage. In general, repair costs for this type of problem can vary greatly depending on the vehicle and the mechanic performing the work. In a mainstream vehicle, expect to pay between $200 and $400 for the parts and labor costs.


Crankshaft position sensors are vital to the functioning of your car’s engine to know more visit here They monitor the rotational speed and location of the crankshaft, and send information to the engine control unit to adjust spark timing and fuel injection for optimal performance. A crankshaft sensor that’s not working properly can lead to a variety of problems, including poor gas mileage and difficulty starting the vehicle. Eventually, you’ll need to replace it to restore proper function to your engine. If you have an issue with your crankshaft sensor, it’s important to get it replaced as soon as possible. Otherwise, your vehicle might struggle to start and stall more often, or even stop running altogether.

To replace a crankshaft position sensor, you’ll need the right tools and parts. You’ll need a jack stand to secure your vehicle, and an appropriately-sized socket and ratchet handle to remove the sensor bolts from the engine. Afterward, you’ll need to lubricate the O-ring on the new sensor before installing it.

What’s Next?

Your vehicle’s crankshaft position sensor reads the teeth on a ring that sits around the crankshaft. It tells the engine control module (ECM) when to fire spark plugs or fuel injectors. There are several types of position sensors. They include magnetic pick-up coils, Hall-effect sensors, magneto-resistive elements and optical sensors.