How to Reset Crankshaft Position Sensor: Troubleshoot the No Start Issue.


To reset a crankshaft position sensor for a no-start issue, disconnect the battery for at least 30 minutes. This will reset the sensor, allowing it to recalibrate once the battery is reconnected.

A faulty crankshaft position sensor can cause issues with your vehicle’s starting system, resulting in a no-start condition. It is important to address this issue as it can cause further damage to other components if left unattended. Regular maintenance and inspections can help prevent these types of problems from occurring.

If you suspect a faulty crankshaft position sensor, seek the help of a professional mechanic to diagnose and repair the problem.

How to Reset Crankshaft Position Sensor: Troubleshoot the No Start Issue.


What Is A Crankshaft Position Sensor?

Definition Of A Crankshaft Position Sensor

A crankshaft position sensor, commonly known as a ckp sensor, is an essential component of a vehicle’s engine management system. It is responsible for providing information about the positioning and speed of the crankshaft.

Some key aspects of a ckp sensor include:

  • It can detect any changes in the speed of the crankshaft.
  • It is typically located at the bottom of the engine block.
  • It consists of a magnetic sensor controlled by an electronic circuit.

Brief Overview Of How It Works In A Vehicle

The ckp sensor works by tracking the magnetic field generated by a toothed wheel mounted on the crankshaft. As the crankshaft rotates, the ckp sensor reads the changes in the magnetic field and sends a signal to the engine control module (ecm).

The ecm then uses this information to determine the exact position and speed of the crankshaft. This data is essential for the ecm to control the timing and firing of the spark plugs and fuel injectors.

Importance Of A Properly Functioning Crankshaft Position Sensor

The ckp sensor plays a vital role in the proper functioning of a vehicle’s engine management system. Any issues with the ckp sensor can result in problems such as:

  • Hard starting or a no-start condition
  • Engine misfires or stalling
  • Poor fuel economy
  • Increased emissions

Therefore, it is essential to ensure that the ckp sensor is in good working condition. If you notice any of the symptoms mentioned above, it is important to troubleshoot the issue and potentially reset the ckp sensor.

Signs Of A Failing Crankshaft Position Sensor

Explanation Of Common Signs Of A Failing Sensor:

A crankshaft position sensor plays a critical role in the functioning of a vehicle’s engine. It helps monitor the position and speed of the crankshaft, which determines the ignition and fuel timing in the engine. If it starts malfunctioning, you may notice these signs:

  • Check engine light: The first and most obvious sign of a faulty crankshaft position sensor is the activation of the check engine light. So if you notice it illuminating on your dashboard, get your car inspected immediately.
  • Difficulty starting: One of the most common issues associated with a failing crankshaft position sensor is difficulty starting your vehicle. If you have a hard time starting the engine or if it won’t start at all, it is likely due to a faulty sensor.
  • Engine misfiring: When the sensor sends incorrect information to the ecu (engine control unit), it can cause the engine to misfire. It may also happen due to a damaged wiring connection or a damaged sensor.
  • Stalling: Sometimes, a faulty sensor may cause your engine to stall while driving or at idle. This is a serious issue that can pose a threat to your safety while on the road.

Detail On Symptoms, Including No-Start Issues And Engine Misfiring:

The following are some more detailed signs that may indicate a failing crankshaft position sensor:

  • No start issue: If you keep trying to start your vehicle and can’t get it to turn over, the most likely culprit is a failed crankshaft position sensor. You may also notice a rough idle and sputtering while trying to start the engine.
  • Engine misfiring: When the crankshaft position sensor is acting up, it can send incorrect information to the ecu, which will, in turn, lead to incorrect fuel and ignition timing. This can lead to rough idle, stalling, or engine misfiring. Misfires can cause long-term engine damage if left unattended, so it’s crucial to have your vehicle inspected as soon as possible.
  • Check engine light: As mentioned earlier, the check engine light is the first and most noticeable sign of a failing crankshaft position sensor. It can also be accompanied by other warning lights such as the abs light, traction control light or the battery light.
  • Reduced engine performance: When the engine control unit receives incorrect information from the crankshaft position sensor, the engine may not perform to its full potential. A drop in acceleration, sluggish performance, and reduced speed are some signs of a faulty crankshaft position sensor.

Brief Explanation Of Why These Symptoms Occur:

The crankshaft position sensor receives signals from the engine’s crankshaft, which is responsible for the movement of the pistons in the engine. When the sensor fails, it sends incorrect signals to the ecu, leading to issues like stalling, misfiring, and other problems.

One common reason for a malfunctioning sensor is damaged wiring or sensor itself. Another reason is the build-up of debris or dirt around the sensor, interfering with its ability to send accurate signals. Detecting and resolving problems with the crankshaft position sensor can help ensure your vehicle’s engine runs smoothly and reliably.

Troubleshooting The No-Start Issue

Resetting the crankshaft position sensor is a crucial step in troubleshooting a no-start issue. Without this process, your vehicle may be unable to start, leaving you stuck and frustrated. In this section, we will go over the steps involved in resetting the crankshaft position sensor and explain how to check the sensor and wiring for any issues.

Overview Of The Steps Involved In Resetting The Crankshaft Position Sensor

Before getting started with resetting the crankshaft position sensor, it’s essential to understand the steps involved. You should follow these steps carefully to ensure that you reset the sensor properly and safely.

The steps involved in resetting the crankshaft position sensor are:

  • Disconnect the battery
  • Locate the sensor
  • Remove the sensor
  • Reset the sensor
  • Reinstall the sensor
  • Reconnect the battery

Keep in mind that the exact steps may vary depending on your vehicle’s make and model. It’s always best to consult your vehicle’s owner’s manual for specific instructions.

Detailed Explanations And Steps For Checking The Sensor And Wiring

Once you’ve reset the crankshaft position sensor, the next step is to check the sensor and wiring for any issues that may be causing the no-start problem.

Here are the steps you should follow:

  • Look for any visible physical damage or wear on the sensor.
  • Check the wiring connectors for any signs of rust, corrosion, dirt, or debris.
  • Use a voltmeter to test the sensor’s voltage.
  • Check the voltage on the wiring connectors.
  • Inspect the wiring for any visible damage or wear.

If you find any issues during this process, it’s crucial to fix them as soon as possible to ensure that your vehicle runs smoothly again. You may need to replace the sensor or wiring connectors if they are damaged.

Importance Of Following Proper Procedures

It’s essential to follow proper procedures when resetting the crankshaft position sensor to avoid any further damage to your vehicle. It’s possible to cause electrical issues or short out the wiring if you don’t follow the correct steps.

You should always ensure that you have the right tools and equipment before attempting to reset the crankshaft position sensor. Additionally, following the right safety procedures will prevent any accidents when working on your vehicle.

Resetting the crankshaft position sensor is a critical step when troubleshooting a no-start issue. Follow these steps carefully and check the sensor and wiring for any damage or wear. Always follow proper procedures to avoid any further damage to your vehicle and ensure it runs smoothly.

How To Reset The Crankshaft Position Sensor

Explanation Of The Different Methods For Resetting The Sensor

The crankshaft position sensor (ckp) is located on the engine and helps to determine the position of the crankshaft. In case of incorrect readings, the engine may not start. To troubleshoot the “no start” issue, one can reset the sensor.

Following are the two ways to reset the ckp:

  • Automatic reset: In this method, the ckp sensor is reset by disconnecting the battery for several minutes. This process clears all the codes and resets the sensor.
  • Manual reset: The manual reset method is more accurate and effective because it involves physically manipulating the sensor.

Step-By-Step Guide For Manually Resetting The Sensor

To manually reset the ckp sensor, follow these simple steps:

  • Locate the ckp sensor: Look for a small sensor usually attached to the engine or transmission with a two- or three-pin connector.
  • Disconnect the wiring harness: Use a pair of pliers or a screwdriver to remove the wiring harness from the sensor.
  • Remove the sensor: Depending on the make and model of your vehicle, use a wrench or a socket to remove the sensor from the engine or transmission.
  • Clean the sensor: Use a brake cleaner or carburetor cleaner to clean the sensor’s surface and the area around the mounting hole.
  • Reinstall the sensor: Install the ckp sensor back onto the engine or transmission, attaching it securely with the wrench or socket.
  • Reconnect the wiring harness: Use the pliers or a screwdriver to reconnect the sensor’s plug connector to the wiring harness.
  • Turn the ignition switch to on and wait for a few seconds, then start the engine.

Tips For Safely Completing The Reset Process

Safety precautions should be followed when resetting the ckp sensor. Here are some tips to ensure that you complete the reset process without any issues:

  • Always work with the engine turned off: Do not attempt any work while the engine is running.
  • Disconnect the battery before starting: Disconnecting the battery will prevent any accidental electrical contact.
  • Wear gloves and safety glasses: These precautions will protect your hands and eyes from dirt, debris, or any other hazards.
  • Use the proper tools: Using the right tools for the job will ensure that you complete the reset process quickly and accurately.
  • Don’t rush: Take your time and complete the reset process carefully, ensuring that all steps are followed to the letter.
  • Refer to the user manual: If you are unsure about any of the steps, or any safety precautions, refer to the vehicle manual or seek professional assistance.

By following these tips, you can safely and effectively reset the ckp sensor, ensuring that your engine starts correctly.

Frequently Asked Questions For How To Reset Crankshaft Position Sensor No Start

What Is A Crankshaft Position Sensor (Cps)?

A crankshaft position sensor (cps) is an electronic sensor that measures the rotational speed of your engine’s crankshaft. It sends a signal to the engine control module to ensure proper fuel injection and ignition timing.

How Do You Know If Your Cps Is Faulty?

If your engine intermittently misfires or hesitates, stalls, or doesn’t start at all, your cps might be faulty. Check engine light and trouble codes can also indicate a bad cps.

How Do You Reset A Faulty Cps?

To reset a faulty cps, you need to disconnect the battery, remove the cps sensor, clean the sensor tip and mounting surface, install the cps sensor, reconnect the battery, and start the engine.

How Do You Replace A Faulty Cps?

To replace a faulty cps, you need to locate the sensor, disconnect the electrical connector and mounting bolts, remove the sensor, replace it with a new one, reconnect the electrical connector and mounting bolts, and test the new sensor.

Can You Drive With A Faulty Cps?

You should not drive with a faulty cps because it can cause serious engine problems, such as poor fuel economy, reduced performance, and permanent engine damage. Replace or reset a faulty cps as soon as possible.


Now that you have understood how to reset a crankshaft position sensor and fix the no start issue, you can apply these steps safely and accurately. Remember to always keep safety precautions in mind in case of any repairs to avoid injury or damage to your vehicle.

Troubleshooting and identifying the issue is key to solving problems with your car, and with this information at hand, you can diagnose and fix any issues related to the crankshaft position sensor. Regular maintenance and inspection of your vehicle can also ensure its longevity and prevent such issues from occurring in the first place.

So, don’t hesitate to take your vehicle to a mechanic if you detect any unusual symptoms and keep learning about your car to maintain it in good condition.

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