How to Fix No Start with Crankshaft Position Sensor Reset

To reset the crankshaft position sensor for a no start condition, disconnect the battery and wait for 30 minutes before reconnecting it. A crankshaft position sensor is an essential component in a car engine that helps the ignition system accurately time the spark.

If the sensor malfunctions, it can prevent the engine from starting. At times, resetting the position sensor can fix the issue. It is a simple process, but incorrect handling can damage the engine or worsen the problem. In this article, we will guide you on how to reset the crankshaft position sensor as a probable solution to a no start car engine issue.

Keep reading to learn how to do this correctly.

How to Fix No Start with Crankshaft Position Sensor Reset


Understanding The Crankshaft Position Sensor

Brief Introduction To The Crankshaft Position Sensor

If you’ve ever experienced a car that won’t start, chances are it might be due to a damaged or malfunctioning crankshaft position sensor. This component plays a vital role in ensuring that the engine starts correctly. Without it, the car’s computer system would not be able to accurately determine the engine’s position, leading to a no-start situation.

We’ll take a closer look at the crankshaft position sensor and its role in starting the engine.

The Importance Of The Crankshaft Position Sensor

The crankshaft position sensor is a vital component in the engine management system of modern vehicles. It is responsible for providing the engine control module (ecm) with accurate information on the engine’s position and speed. Without this information, the ecm would not be able to control the fuel injection system, ignition timing, and other critical systems required for proper engine operation.

Here are some key points to consider:

  • The crankshaft position sensor detects the position of the engine’s rotating crankshaft and sends this data to the car’s computer for processing.
  • The ecm uses this data to determine the appropriate fuel injection timing, ignition timing, and other critical engine parameters.
  • A malfunctioning crankshaft position sensor can cause a variety of problems, including a no-start condition, stalling engine, or poor performance.
  • Generally, a faulty crankshaft position sensor will trigger a check engine light, alerting the driver to the issue.

How The Crankshaft Position Sensor Works

The crankshaft position sensor operates by using a magnetic sensor to detect the position of a toothed wheel mounted on the crankshaft. As the engine turns over, the wheel rotates, and the sensor detects each tooth as it passes by.

Here are some key points to consider:

  • The sensor generates a small electrical signal each time a tooth on the flywheel passes by.
  • The ecm uses this signal to determine the current position of the crankshaft and adjust engine systems accordingly.
  • Crankshaft position sensors can fail due to damage, wear, or wiring issues.
  • In some cases, dirt or debris can accumulate on the sensor causing it to malfunction.

Signs Of A Failing Crankshaft Position Sensor

A failing or damaged crankshaft position sensor can cause a range of symptoms that can be hard to diagnose. Here are some key signs that might indicate a problem:

  • The engine won’t start, or it cranks but won’t fire.
  • The engine stalls or idles poorly.
  • The vehicle emits excessive smoke.
  • The car’s fuel efficiency decreases.

The crankshaft position sensor is a vital component in any modern vehicle’s engine management system. Ensuring that it’s functioning correctly is key to maintaining proper engine operation and overall vehicle performance. If you suspect that your vehicle’s crankshaft position sensor is faulty, it’s important to have it diagnosed and repaired as soon as possible to avoid further damage to your vehicle.

Common Symptoms Of A Failed Crankshaft Position Sensor

Overview Of Common Symptoms Of A Failed Crankshaft Position Sensor

The crankshaft position sensor is a vital component to ensure a smooth engine operation. It monitors the rotation of the crankshaft and provides data to the engine control module (ecm) to adjust the ignition timing and fuel injection. If the crankshaft position sensor fails, it can lead to various engine problems.

Here are some common symptoms of a failed crankshaft position sensor:

  • Engine misfiring
  • Stalling or difficulty in starting
  • Reduced engine power
  • Rough idling or vibration
  • Engine hesitation or surging
  • Check engine light illuminated
  • Poor acceleration performance

How To Diagnose A Failed Crankshaft Position Sensor

Diagnosing a faulty crankshaft position sensor can be tricky as the symptoms are common to other engine problems. However, there are some ways to determine if it is indeed the crankshaft position sensor causing the issues:

  • Use a code scanner: Modern cars come with an onboard diagnostics system that reads fault codes recorded by the ecm. You can use an obd-2 scanner to retrieve the codes and determine if the crankshaft position sensor is failing.
  • Check wiring and connections: The sensor requires a steady flow of voltage to operate correctly. Check the wiring and connections for any frayed wire or loose connection that could cause intermittent signals to the ecm.
  • Test the sensor with a multimeter: Use a multimeter to measure the resistance of the sensor. If the reading is incorrect, it indicates a faulty sensor.

If you are unsure of how to diagnose the fault, take your vehicle to a certified mechanic. They can use specialized equipment to diagnose the problem accurately and replace the sensor if necessary.

Remember, a failing crankshaft position sensor can cause various engine problems, resulting in reduced engine performance and the risk of a catastrophic engine failure. If you experience any symptoms of a failing sensor, address the issue immediately to prevent further damage.

Resetting The Crankshaft Position Sensor

Step-By-Step Process On How To Reset The Crankshaft Position Sensor

Resetting your crankshaft position sensor is a necessary step when you are experiencing a no-start issue. This process is simple and can be done with a few tools. Below are the steps to reset the crankshaft position sensor.

  • Disconnect the car battery
  • Locate the crankshaft position sensor, which is usually behind the engine near the transmission bell housing
  • Disconnect the sensor from the wiring harness
  • Use a wrench to remove the bolts that attach the sensor to the engine
  • Remove the sensor carefully by pulling it straight out
  • Clean the mounting surface with a cloth and some brake cleaner spray
  • Insert the new sensor by aligning it with the mounting holes
  • Tighten the bolts that attach the sensor
  • Reconnect the sensor to the wiring harness
  • Reconnect the battery

Tools Needed For Resetting The Sensor

It’s a good idea to have a few tools on hand to help you reset the crankshaft position sensor. Here’s a list of the tools you’ll need:

  • Wrench
  • Socket set
  • Brake cleaner spray
  • Cloth

Tips To Ensure Successful Resetting Of The Sensor

To make sure you reset the crankshaft position sensor correctly, here are a few tips:

  • Always disconnect the battery before you start
  • Handle the sensor carefully when removing it
  • Clean the mounting surface properly
  • Double-check that the new sensor is aligned and securely attached
  • Reconnect the battery properly

By following these tips, you can ensure the successful and accurate resetting of your crankshaft position sensor. Remember to take your time and be patient. Good luck!

Alternative Fixes For No Start Issues

In some cases, resetting the crankshaft position sensor may not solve the no-start issue. Several other problems could also cause the engine not to start. Here are some alternative fixes to try:

Checking Fuel System

Fuel delivery issues can cause difficulty starting your engine. The fuel system consists of several components, including the fuel pump, fuel filter, fuel injectors, and fuel lines. If any of these components fail, fuel delivery to the engine may be insufficient.

Follow these steps to check the fuel system:

  • Check fuel pressure regulator
  • Inspect fuel pump fuse
  • Check fuel pump relay
  • Inspect the fuel filter

Checking Ignition System

The ignition system is responsible for igniting the fuel mixture in the engine. If the ignition system fails, the engine will not start. Follow these steps to check the ignition system:

  • Inspect spark plugs
  • Check spark plug wires
  • Inspect distributor cap and rotor
  • Check ignition coil

Other Potential Causes Of No Start Issues Apart From The Crankshaft Position Sensor

Several other factors can cause no-start issues in a vehicle. These include:

  • Dead battery
  • Failed alternator
  • Bad starter motor
  • Clogged air filter
  • Damaged fuel pump
  • Faulty sensors

Before replacing parts or performing expensive repairs, it’s essential to diagnose the underlying issue correctly. If you’re unsure how to proceed, it’s best to consult with a trusted mechanic.

Remember, if you’re not comfortable working on your car’s mechanical parts, it’s best to leave the work to a professional. And as always, safety should be your top priority when dealing with cars and engines.

Preventing The No Start Issue From Reoccurring

If your car’s engine doesn’t start, the problem might be your vehicle’s crankshaft position sensor. This small sensor plays a critical role in determining the position of the crankshaft as it turns over. But what if you’ve already fixed the crankshaft position sensor no start issue and want to ensure it doesn’t happen again?

This blog post has you covered.

How To Maintain The Crankshaft Position Sensor For Optimal Performance

To keep the sensor working at its best, be sure to adhere to these maintenance tips:

  • Check the sensor’s connections and wiring for any signs of damage or corrosion.
  • Inspect the sensor itself to see if there are any signs of wear or damage.
  • Clean the sensor every time you perform an oil change.
  • Replace the sensor according to the manufacturer’s guidelines.

Regular Checkups For Early Detection Of Issues To Prevent The No Start Problem From Reoccurring

Preventing the no start issue from reoccurring is all about early detection. The earlier you can detect and correct an issue, the less likely it is to cause further damage and lead to a no start situation. To stay on top of things:

  • Have your vehicle regularly serviced by a qualified mechanic.
  • Regularly inspect your vehicle’s engine components for any signs of wear or damage.
  • Pay attention to any warning lights or unusual engine behavior.
  • Make sure to address any issues as quickly as possible.
  • Keep a record of when your vehicle’s components were last checked or replaced.

Recap Of Key Points Covered In The Article

If you want to prevent the crankshaft position sensor no start issue from reoccurring, you need to regularly maintain the sensor, conduct regular checkups, and address any issues as soon as they arise. Keeping these key points in mind can help keep your vehicle running smoothly.

Importance Of Early Detection And Proper Maintenance Of The Crankshaft Position Sensor

The crankshaft position sensor might be a small component, but it plays a significant role in helping your vehicle start. By conducting regular checkups and keeping an eye out for any issues, you can stay ahead of any potential problems with the sensor.

Additionally, proper maintenance can optimize the sensor’s performance and help extend its lifespan. Remember, with the help of these simple tips, you can prevent the annoying and potentially costly no start issue caused by a faulty crankshaft position sensor.

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

What Is A Crankshaft Position Sensor And What Does It Do?

A crankshaft position sensor is an electronic device that monitors the rotation of the engine’s crankshaft. This sensor provides information to the car’s computer about the crankshaft’s position, allowing the computer to control engine timing and fuel injection.

What Happens When The Crankshaft Position Sensor Fails?

If the crankshaft position sensor fails, the engine may not start, stall while driving, or misfire. This can also cause a decrease in fuel efficiency and engine power. It can also trigger the check engine light.

How Do I Know If My Crankshaft Position Sensor Needs To Be Reset?

You will know if your crankshaft position sensor needs to be reset if your car’s computer displays error codes, the check engine light is on, there’s a no start or stall while driving.

Can I Reset The Crankshaft Position Sensor Myself?

Yes, you can reset the crankshaft position sensor yourself. However, it is important to follow the manufacturer’s instructions closely and to use the right tools to avoid causing damage to the sensor or engine components.

What Tools Do I Need To Reset The Crankshaft Position Sensor?

You will need an obd-ii scan tool, a wrench or socket set, and a set of safety glasses. Make sure to read the manufacturer’s instructions for your specific car model.


Based on the aforementioned tips and tricks, resetting the crankshaft position sensor no start is a simple task that any diy enthusiast can accomplish. It is important to ensure that the sensor is properly calibrated, and the timing of the engine is set correctly to avoid any future complications.

Always keep in mind that if the problem persists, it is always advisable to seek the services of a professional mechanic. It is worth noting that regular car maintenance is important to avoid unexpected car troubles. As a car owner, ensure that you regularly check your car and perform necessary repairs and replacements to ensure that your vehicle runs smoothly.

With this in mind, it is crucial to remember that prevention is better than cure. Keep your car in good condition, and you’ll enjoy a stress-free driving experience for years to come.

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