Friday, June 9, 2023
HomeHow to Reset Crankshaft Position Sensor: DIY Guide to No-Start Fixes.

How to Reset Crankshaft Position Sensor: DIY Guide to No-Start Fixes.

To reset a crankshaft position sensor, disconnect the battery, remove the sensor, and install a new one. This is a common solution if your vehicle won’t start due to a faulty sensor.

The sensor may be located in different positions depending on your vehicle’s make and model, so consult your vehicle’s manual for specific instructions. If you’re experiencing issues with your vehicle not starting due to a malfunctioning crankshaft position sensor, it can be frustrating and concerning.

The good news is that it’s often a relatively simple fix. In this article, we’ll walk you through the steps to reset the sensor and get your car back up and running. Whether you’re a seasoned mechanic or just starting out, following these steps can save time and money compared to taking your vehicle to a shop.

How to Reset Crankshaft Position Sensor: DIY Guide to No-Start Fixes.


What Is A Crankshaft Position Sensor?

Definition Of Crankshaft Position Sensor

The crankshaft position sensor is an electronic device that measures the position of your engine’s crankshaft, which helps your car’s engine control module (ecm) determine the ignition and fuel injection timing. It is located near or on the engine’s crankshaft, measuring its speed and position by sending data to the ecm.

Some types of crankshaft position sensors include hall effect, inductive, and reluctance sensors. Hall effect sensors rely on a magnetic field, inductive sensors on an inductive pickup coil, and reluctance sensors on changes in magnetic fields.

Function Of Crankshaft Position Sensor

The crankshaft position sensor plays a vital role in your car’s engine system. Its primary function is to gather information about the rotational speed and position of the engine’s crankshaft. It provides accurate data for the ecm to determine the appropriate timing of ignition and fuel injection.

Here are the functions of the crankshaft position sensor:

  • Monitors the position of the crankshaft’s rotation
  • Measures the speed of the crankshaft rotation
  • Sends signals to the ecm to control the fuel injection timing
  • Triggers the ignition system’s spark plugs

Overall, a faulty crankshaft position sensor can cause a no-start condition or poor performance, so it is essential to ensure it is functioning correctly.

Signs Of A Failing Crankshaft Position Sensor

The crankshaft position sensor is a critical component of your car’s engine and plays a vital role in the ignition system. The sensor monitors the position and speed of the crankshaft, which allows your car’s ecu to tailor the ignition timing and fuel injection sequence.

If the crankshaft position sensor is not working correctly, it can cause several problems that can hinder the engine’s performance. Here are some signs of a failing crankshaft position sensor:

Engine Misfire

One of the first signs of a failing crankshaft position sensor is when the engine starts misfiring. Misfiring happens when the ignition system fails to deliver the appropriate amount of spark required to burn the fuel mixture in the combustion chamber.

It causes the engine to run poorly and creates a rough idle. This issue can become severe enough to harm your vehicle’s fuel efficiency and performance.

• Rough Idle

• Poor Fuel Efficiency

• Engine Running Poorly

Decreased Fuel Efficiency

Another sign of a damaged crankshaft position sensor is decreased fuel efficiency. Since the sensor is responsible for regulating the fuel injection system, a failing sensor can cause the system to malfunction, leading to higher fuel consumption. You might notice that your car’s gas mileage has decreased dramatically.

• Higher Fuel Consumption

• Decreased Gas Mileage

• Engine Is Running Roughly

Engine Stalling

A failing crankshaft position sensor can also cause your engine to stall unexpectedly, a dangerous situation if you’re driving at high speed. A faulty sensor might disrupt the timing of the ignition system, leading to delayed spark plug firing, leaving fuel unburned, and eventually causing the engine to stall.

• Engine Stalls Unexpectedly

• Increased Danger When Driving At High Speeds

• Delayed Spark Plug Firing

No-Start Condition

Finally, a failing crankshaft position sensor can cause your engine not to start at all. A critical issue that requires immediate attention, a damaged sensor can prevent the engine from receiving a signal necessary for ignition. If this happens, your car won’t start, indicating that the sensor has failed completely.

• Engine Fails To Start

• Causes Critical Issues That Require Immediate Attention

• Sensor Has Failed Completely

The symptoms of a failed crankshaft position sensor include misfiring, decreased fuel efficiency, engine stalling, and a no-start condition. Detecting and addressing these issues early can prevent severe damage to your vehicle and keep you on the road.

Diagnostic Procedures

If your vehicle won’t start, the crankshaft position sensor (ckp) may be at fault. The ckp sensor monitors the speed and position of the crankshaft, allowing the engine control module (ecm) to determine the correct timing for ignition and fuel injection.

If the ckp sensor sends incorrect signals to the ecm, it can cause a range of problems, including engine stalling, misfires, or failure to start. Follow these diagnostic procedures using an obd-ii scanner, multimeter testing, and visual inspection to reset the ckp sensor and bring your vehicle back to life.

Obd-Ii Scanner And Error Codes

An obd-ii scanner is a useful tool for resetting the ckp sensor and identifying any error codes in the system. Here are the steps to follow:

  • Plug in the obd-ii scanner into the diagnostic port under the dashboard of your vehicle.
  • Turn on the ignition, but do not start the engine.
  • Use the scanner to retrieve any error codes stored in the ecm.
  • Check the code descriptions and determine if they relate to the ckp sensor or another component.
  • Clear any error codes and start the engine to see if the problem is resolved.

Multimeter Testing

If the obd-ii scanner does not detect any error codes, the problem may be the ckp sensor itself. You can use a multimeter to test the ckp sensor’s resistance and voltage output. Follow these steps:

  • Disconnect the ckp sensor from the wiring harness.
  • Set the multimeter to measure resistance or voltage, depending on the manufacturer’s specifications.
  • Use the multimeter’s probes to test the ckp sensor’s resistance or voltage output.
  • Compare the results to the manufacturer’s specifications to see if the sensor is within tolerance.
  • If the sensor is out of tolerance, replace it with a new one and retest.

Visual Inspection

A visual inspection can also help you determine if the ckp sensor is the problem. Check the wiring harness and sensor connections for any damage, wear, or corrosion. If you find any problems, repair or replace the damaged components.

These diagnostic procedures can help you reset the ckp sensor and fix any no-start issues in your vehicle. By using an obd-ii scanner, multimeter testing, and visual inspection, you can identify and resolve problems with the ckp sensor quickly and effectively.

How To Reset The Crankshaft Position Sensor

The crankshaft position sensor is an essential component of your car’s engine management system, responsible for detecting the precise position of the crankshaft. A malfunctioning crankshaft position sensor can cause significant starting issues, leading to a no-start condition. In this section, we will guide you on how to reset the crankshaft position sensor in a few simple steps.

Step-By-Step Procedure

Resetting the crankshaft position sensor requires a few simple steps that we have outlined below:

  • Turn off the ignition: Before resetting the crankshaft position sensor, ensure that the ignition is turned off, and the key is removed.
  • Locate the sensor: The crankshaft position sensor is typically located near the crankshaft’s base and can be identified by the electrical connector attached to it.
  • Disconnect the sensor: The next step is to disconnect the electrical connector attached to the sensor. To do this, depress the lock tab and pull the connector out firmly.
  • Wait for a few minutes: After disconnecting the sensor, wait for a few minutes, allowing the system to reset completely.
  • Reconnect the sensor: After waiting for a few minutes, reconnect the electrical connector to the sensor by firmly pushing it into place.
  • Turn on the ignition: Finally, turn on the ignition and start the car. The system should now be reset.

Tools Needed

To reset the crankshaft position sensor, you will require some simple tools that you may already have in your toolkit. These include:

  • Screwdriver
  • Pliers
  • Work gloves (optional)

Ensure you have these tools ready before attempting to reset the sensor.

Safety Precautions

Before resetting the crankshaft position sensor, it is essential to keep in mind some safety precautions and best practices. These include:

  • Wear work gloves to prevent any cuts or bruises while working on the car.
  • Don’t attempt to reset the sensor while the car is running.
  • Make sure the car is in a safe and stable position before attempting any repairs.
  • Disconnect the battery before working on any electrical components to avoid any electrical shock accidents.

By following these safety precautions, you can perform the task with additional safety measures, and reduce the potential risks while performing repairs.

Resetting the crankshaft position sensor is a simple process that requires a few basic tools and crucial safety precautions. Following our step-by-step guide, anyone can reset the sensor effortlessly. Remember, if your car is still experiencing starting issues after attempting to reset the sensor, it’s best to consult with a professional mechanic to diagnose and repair the problem.

Other Possible Causes Of A No-Start Condition

Fuel System Issues

If the crankshaft position sensor reset didn’t fix the no-start condition, there could be several other possible causes. One of them is a problem with the fuel system. Here are the key points to consider:

  • Check the fuel level in the tank. Make sure there’s enough gas to start the engine.
  • Inspect the fuel pump for any damage or leaks. A faulty fuel pump may prevent the fuel from reaching the engine.
  • Examine the fuel filter for clogging or contamination. A dirty fuel filter may restrict the flow of fuel to the engine.
  • Check the fuel injectors for proper operation. Faulty or clogged injectors may prevent the fuel from entering the engine.

Ignition System Issues

Another possible cause of a no-start condition is a malfunctioning ignition system. Here are some key points to keep in mind:

  • Check the ignition switch for signs of damage or wear. A faulty ignition switch may prevent the starter motor from engaging or the spark plugs from firing.
  • Inspect the spark plugs for wear, fouling, or damage. Faulty spark plugs may prevent the engine from starting or cause misfiring.
  • Check the ignition coil for proper operation. A faulty ignition coil may prevent the spark plugs from firing.
  • Examine the distributor cap and rotor for cracks, wear, or damage. Faulty cap and rotor may prevent the spark from reaching the spark plugs.

Battery Or Starter Motor Issues

If the fuel and ignition systems are functioning correctly, there may be an issue with the battery or starter motor. Here are the key points to consider:

  • Check the battery for a charge and condition. A weak or dead battery may prevent the starter motor from cranking the engine.
  • Inspect the battery cables and terminals for corrosion or looseness. Poor connections may prevent the battery from delivering power to the starter motor.
  • Examine the starter motor for proper operation. A faulty starter motor may not have enough power to turn the engine over.

Engine Mechanical Issues

Finally, if the above systems are working correctly, there may be a mechanical issue with the engine itself. Here are some key points to keep in mind:

  • Inspect the timing belt or chain for wear or damage. A broken or jumped timing belt/chain may cause the engine to fail.
  • Check the compression in each cylinder. Low compression may prevent the engine from starting.
  • Examine the engine for any leaks or damage that may cause the engine to malfunction.
  • Ensure that the engine oil level is sufficient and there are no oil leaks. Inadequate oil may cause engine damage and prevent the engine from starting.

By checking each of these possible causes, you can further diagnose and fix the underlying problem that is causing your engine to not start.

Preventive Measures For The Crankshaft Position Sensor

The crankshaft position sensor is a vital component of any vehicle, and its failure can cause a variety of problems. However, you can save yourself the hassle of dealing with a malfunctioning sensor by adopting simple preventative measures. Here are the measures to consider.

Regular Inspection And Maintenance

The simplest and most effective way to ensure that your crankshaft position sensor is functioning correctly is by conducting regular inspections and maintenance. Take time to inspect the sensor for any wear and tear, and if there is any, replace it.

Regular maintenance also ensures that the sensor stays clean, allowing it to function effectively.

Some of the things to inspect include:

  • Wiring: Check the wiring harness to ensure that it isn’t damaged, frayed, or corroded.
  • Connections: Ensure that the connections are tight and free of debris and dirt.
  • Sensor location: Verify that the sensor is in the correct position and still attached to the vehicle.

Avoid Driving Over Bumpy Roads

Driving over rough and bumpy roads can lead to impacts and jolts that might damage the crankshaft position sensor. The continuous jarring of the sensor can displace it, cause it to malfunction or even break it. As much as possible, try to avoid driving over bumpy or uneven roads.

Keep The Engine Clean And Dry

Dirty or wet engine compartments expose the crankshaft position sensor to potential damage. Always keep the engine clean and dry, thereby, avoiding excess moisture that can corrode electrical components.

Here’s what you need to do:

  • Clean the engine with a high-pressure water jet or compressed air regularly.
  • Do not spray water or cleaning liquids directly onto the sensors, as it could damage them.
  • Address oil leaks immediately: The oil can collect on the crankshaft position sensor, damaging it and reducing its lifespan.

It is essential to take good care of the crankshaft position sensor. Regular inspection and maintenance, avoiding bumpy roads, and keeping the engine clean and dry can help prolong the sensor’s life and save you from frustrating repairs. Trust us; the effort you put in now can save you from greater expenses down the road.

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

Why Does A Failed Crankshaft Position Sensor Cause A No Start Condition?

A failed crankshaft position sensor sends incorrect signals to the engine control module, causing the engine to not start or to stall while driving.

How Can I Tell If My Car’S Crankshaft Position Sensor Is Bad?

Symptoms of a bad crankshaft position sensor include a no start condition, engine stalling, reduced power and acceleration, and an illuminated check engine light.

Can I Reset The Crankshaft Position Sensor On My Own?

Yes, you can reset the crankshaft position sensor by disconnecting the battery for a few minutes, but it’s important to diagnose and fix the underlying issue first.

Do I Need To Replace A Failed Crankshaft Position Sensor?

Yes, a failed crankshaft position sensor needs to be replaced with a new one. It’s important to have a professional diagnose the issue and install the new sensor properly.

How Much Does It Cost To Replace A Crankshaft Position Sensor?

The cost of replacing a crankshaft position sensor varies depending on the make and model of your vehicle and the location of the sensor. It typically costs between $100 and $250 for parts and labor.


After following the above-mentioned steps, your crankshaft position sensor should now be reset, and your engine should start smoothly. It is essential to note that a faulty crankshaft position sensor can cause serious engine problems and can even prevent your car from starting.

With the right tools and know-how, though, you can save yourself time and money by resetting it yourself. Being proactive and addressing the issue early on can prevent more significant problems from developing down the road. If you are unsure about resetting the crankshaft position sensor on your own, it’s always best to consult with a mechanic or auto-shop.

Keep in mind that regular maintenance can prevent engine problems and ensure your car continues running smoothly for years to come.



Please enter your comment!
Please enter your name here

Most Popular

Recent Comments

error: Content is protected !!