symptoms of a bad crankshaft position sensor

Symptoms Of a Bad Crankshaft Position Sensor

The crankshaft position sensor is a component of engine control that is present in almost all current internal combustion engines. It keeps track of the crankshaft’s position and rate of rotation and transmits that data to the engine management unit so that it can modify as necessary depending on the operating circumstances.

symptoms of a bad crankshaft position sensor

Many engines cannot run if the crankshaft position sensor does not output an accurate signal since the crankshaft speed and position are some of the most crucial factors used in engine management calculations. Crankshaft position sensor faults might be related to several different problems. 2 typical causes are as follows:

Circuitry issues. The crankshaft sensor may experience problems if there is faulty voltage or if the wire is loose, worn out, or broken. Engine overheating. By melting the plastic covering on the crankshaft sensor, an overheated engine may cause damage.

Well, in this article, we’ll get to go over the most common symptoms of a bad crankshaft position sensor. In addition, we’ll see if you can drive with it and how much it will cost you to replace the sensor. So, let’s get started!


Symptoms Of a Bad Crankshaft Position Sensor

Bad crankshaft position sensors include:

  • Engine Vibration Problems.
  • Trouble Starting Car.
  • Misfiring engine.
  • Uneven Accelerations.
  • Sporadic stalling.
  • Check the Engine Light.
  • Slippage In the Fuel Economy.

Engine Vibration Problems

An issue with the engine vibrating is another indication that your crankshaft sensor may be broken. Any such problem could be an indication of cylinder misfiring caused by a failed crankshaft position sensor.

Trouble Starting Car

If starting your car is difficult, that may be a sign that your crankshaft sensor is deteriorating. The sensor monitors the crankshaft’s speed and position. Your car could be tough to start if it’s failing. In reality, the issue could be sporadic, which can make it even more annoying. On the one hand, starting your car could be a lengthy process. On the other hand, your car can just flat-out refuse to start.

Misfiring engine

A stuttering sound or sensation in the engine could indicate that the crankshaft position sensor is failing, which could result in misfired cylinders. A cylinder will misfire if the crankshaft position sensor isn’t functioning properly because it can’t tell where the pistons are in the engine. Although incorrect spark plug timing is another possibility, the crankshaft sensor is more likely to be the culprit if the spark plugs are examined.

Uneven Accelerations

Are you having trouble maintaining a steady speed due to car problems like uneven acceleration? This can be a symptom of a crankshaft failure. Your vehicle’s motor control unit won’t be able to adjust the fuel injection or the spark timing whenever the engine speed rises if your crankshaft sensor isn’t functioning properly.

Sporadic stalling

Intermittent stalling is another symptom frequently connected to a crankshaft position sensor issue. The crankshaft signal may be interrupted while the engine is operating due to problems with the crankshaft position sensor or its wiring, which could lead to an engine stall. This typically indicates a wiring issue. However, this symptom might also be caused by a malfunctioning crankshaft position sensor.

Check Engine Light

Even while a check engine light won’t always indicate that your crankshaft sensor is broken, it’s still possible that this could be the case. You’ll need to utilize a code-scanning program to identify the reason for the check engine light because it could be one of the various issues. You could also visit an auto repair shop.

Slippage In the Fuel Economy

Reduced fuel economy is one issue you’ll experience if your car’s crankshaft isn’t functioning at its best. The fuel injectors in your car won’t efficiently direct petrol to the motor, which is the cause of this. This implies that your vehicle will use more petrol than is necessary when you are moving around, resulting in lower fuel economy than usual.

Of course, poorer fuel efficiency can be a result of other issues. Therefore, it will be worthwhile for you to visit a car repair shop so that a specialist can evaluate the issue and decide on the best course of action.

Can you drive with a bad crankshaft position sensor?

No. Driving without an operational crankshaft sensor is risky and can result in severe engine damage. If your car’s crankshaft sensor fails, you should repair or replace it as soon as feasible. Driving for a long period of time with a faulty crankshaft position sensor is not advised.

This is due to the sensor’s crucial role in the engine management system, delivering critical information regarding the crankshaft’s position and speed to the engine control module (ECM). If the sensor fails, the ECM may be unable to accurately control fuel injection, ignition timing, and other engine functions.

How much does a crankshaft position sensor replacement cost?

A competent mechanic can usually diagnose a crankshaft sensor problem quickly. Usually around one hour. The replacement itself is simple. However, rust around the sensor might occasionally delay the repair process. A mechanic will know how to repair the sensor’s two sections and appropriately adjust the spacing between them.

In a normal car, a crankshaft replacement will cost the sum of the parts and labor, which will take about two hours. A crankshaft sensor replacement should cost between $200 and $400. However, if you own a premium or expensive vehicle, or if accessing the sensor is difficult, the cost can double or even double. New parts are usually used, and they are normally original equipment parts rather than aftermarket parts.

Related Article


What happens when the crank sensor goes bad?

Power loss – A faulty crankshaft position sensor might result in a loss of power in the vehicle. When the computer does not receive the correct data from the sensor, it misfires and reduces power output.

What are the 7 symptoms of a bad camshaft position sensor?

Here Are the 7 Signs That You Have a Bad Camshaft Position Sensor:

  • Check Engine Light is illuminated.
  • Starting Difficulties.
  • Idle Erratic.
  • Hesitation/Loss of Power.
  • The fuel economy has been reduced.
  • The emissions test failed.

Does the crankshaft sensor affect fuel consumption?

Incorrect crankshaft sensor readings create spark timing and fuel injection issues, which not only cause engine splutter but also reduce fuel economy.

What kills a crankshaft sensor?

Heat buildup in the engine can cause crankshaft sensor damage by melting the plastic covering. Circuitry issues. A faulty voltage or loose, worn-out, or damaged wiring might cause problems with the signals delivered to and from the crankshaft sensor.

Does the crank sensor control injectors?

A crank sensor (CKP) is an electrical device used in both gasoline and diesel internal combustion engines to monitor the location or rotational speed of the crankshaft. Engine management systems employ this data to govern fuel injection, ignition system timing, and other engine characteristics.

Can you run a car without a crank sensor?

If you do not have a crankshaft sensor, your car’s engine will not run properly. It can lead to decreased performance, increased fuel consumption, and engine failure.

Can a crank sensor cause a loss of power?

Problems with acceleration: If the crankshaft sensor fails, it will not deliver the correct information to your car’s computer. The engine’s operating system will be unable to synchronize the engine pistons, resulting in slow acceleration and difficulty to maintain speed.

What sensors affect timing?

Crank position sensors (CKP) are electronic devices that monitor the crankshaft’s position and speed. The data from the crank sensor is used by the PCM to control the fuel injection and ignition timing, as well as variable valve timing and other engine settings established by the manufacturer.

What sensor controls engine timing?

The crankshaft and camshaft position sensors, the most crucial sensors in any engine, are essential to the operation of the distributor and ignition timing. The crankshaft position sensor serves as a multipurpose sensor, detecting engine RPM and relative engine speed.

What sensor determines engine speed?

The crankshaft sensor is an important source of engine control information. It senses the crankshaft’s speed and position and sends this information to the engine control as an electrical signal.

Wrapping Up

Do not disregard any of the aforementioned symptoms of crank sensor issues if you have experienced any of them. Find a reputable auto repair shop that can evaluate the issue and determine what’s wrong.

So, that’s it for this article, in which we’ve looked at the most common symptoms of a bad crankshaft position sensor. Also, we get to cover if you can drive with it and how much it will cost you to replace the sensor. Hope it was helpful. If so, kindly share it with others. Thanks for reading; see you around!


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