How to Bypass Crank Position Sensor: A Complete Guide.

To bypass a crank position sensor, you need to connect two wires, turn on the ignition, and connect a jumper wire to the battery. This can be done by following the steps below.

A crank position sensor is a crucial component in modern engines that helps the car’s computer determine the proper fuel injection timing and spark. If you have a faulty crank position sensor or need to bypass it, there are several ways to do it.

However, please note that bypassing the crank position sensor may cause engine damage and is not recommended by experts. Before attempting to bypass the sensor, consult with a professional mechanic or refer to your vehicle’s user manual for instructions. In this article, we’ll discuss the steps required to bypass a crank position sensor in an emergency situation.

How to Bypass Crank Position Sensor: A Complete Guide.


Reasons For Bypassing The Crank Position Sensor

A crank position sensor is an essential part of a vehicle’s engine management system. This sensor detects the position of the engine’s crankshaft, which helps the engine’s computer to determine the correct time to spark and fuel injection. However, in some instances, the crank position sensor can malfunction, leading to various engine problems.

Here are some reasons why you may need to bypass the crank position sensor:

Malfunctioning Sensor Symptoms

A faulty crank position sensor may cause several engine problems, such as engine stalling, misfiring, and reduced power. Below are some of the most common symptoms of a malfunctioning crank position sensor:

  • Engine hesitation, rough idle, or stalling: A faulty sensor can send incorrect signals to the engine control module (ecm), which can cause the engine to stall or hesitate. In some cases, the engine may also run rough at idle.
  • Starting problems: If the sensor fails to detect the engine’s position correctly, it may prevent the engine from starting altogether.
  • Reduced power and acceleration: A malfunctioning sensor can cause the ecm to send incorrect signals to the fuel injectors, leading to reduced power and acceleration.

Reasons To Bypass The Sensor

In some cases, bypassing the crank position sensor may be necessary to keep the vehicle running. Below are some of the reasons why you may need to bypass the sensor:

  • Faulty sensor: If the sensor has failed and cannot be replaced immediately, bypassing it may be a temporary solution to keep the vehicle running until a new sensor is installed.
  • Compatibility issues: Sometimes, the new engine or ecm may not be compatible with the original sensor. In such cases, bypassing the sensor may be necessary to ensure proper engine operation.
  • Diy engine swaps: Amateur mechanics may need to override the sensor to get their diy engine swaps working correctly.

Safety Precautions Before Bypassing The Sensor

Bypassing the crank position sensor is not always a simple task, and it should only be attempted by experienced mechanics. Here are some safety precautions to take before bypassing the sensor:

  • Ensure that the engine is turned off and the battery is disconnected.
  • Check the vehicle service manual to locate the sensor and identify the cables to be manipulated.
  • Use a wiring diagram to understand how the sensor works and to identify the cables that need modification.
  • Double-check all connections to avoid causing any electrical problems.
  • Finally, reconnect the battery and start the engine to check if the bypass worked correctly.

Bypassing the crank position sensor is not advisable unless it is necessary. Malfunctioning crank position sensors should be replaced to ensure that the engine operates correctly. However, in some instances, bypassing the sensor may be the only option. If you are experiencing any issues with your engine, it’s best to have a professional mechanic diagnose and repair the problem.

Choosing The Right Method For Bypassing The Crank Position Sensor

Bypassing the crank position sensor may seem like a complicated task for some, but with the correct information, anyone can do it with ease. There are various methods available for bypassing the crank position sensor, each with its unique benefits and drawbacks.

In this post, we will compare the different methods of bypassing the sensor and provide you with factors to consider when choosing the best method based on your needs.

Different Methods For Bypassing The Sensor

Here are three different methods commonly utilized for bypassing the crank position sensor:

  • Method 1: Jumping the starter
  • Method 2: Using a scan tool
  • Method 3: Hardwiring the sensor

Comparison Of Each Method

Let’s take a closer look at each method.

**method 1: jumping the starter**

Jumping the starter is a popular method for bypassing a crank position sensor. When the starter relay is jumped, it works independently of the crank position sensor, enabling the starter motor to turn without the sensor’s input. Here are some key points to consider when using this method:

  • It is easy and straightforward to do.
  • It is a temporary solution. It is recommended to use this method only in emergencies.
  • Not all cars have easy access to the starter, and jumping the wrong wire could lead to costly damage.
  • It bypasses not only the crank position sensor, but also the engine control module (ecm), which could result in other problems.

**method 2: using a scan tool**

Another preferred method is using a scan tool. This method works by reprogramming the ecm, which subsequently enables the engine to start without the crank position sensor. Below are some points to keep in mind when using this method:

  • It is a permanent solution.
  • This method is more complicated than the first, and it requires a bit of technical knowledge and expertise.
  • The cost of purchasing a scan tool is high.
  • This method is vehicle-specific, and not all cars support it.

**method 3: hardwiring the sensor**

Hardwiring the sensor is another alternative method for bypassing the crank position sensor. This method directly connects the sensor to the ecm, avoiding the need for input from the sensor. Here are some points to consider when using this method:

  • Hardwiring the sensor is a permanent solution.
  • It is easy to do but requires technical knowledge and expertise.
  • It may damage the ecm and other vital engine components if not done properly.
  • This method is vehicle-specific, and not all cars support it.

Factors To Consider When Choosing The Best Method

When choosing a method to bypass the crank position sensor, consider the following factors:

  • The cost of the method: Determine your budget for the solution.
  • The vehicle model: Ensure that the method you choose is compatible with your vehicle.
  • The technical knowledge and expertise required for the method.
  • Safety considerations: Some methods may cause damage to the ecm if not done correctly.
  • Durability: Do you need a temporary or permanent solution?

Bypassing the crank position sensor could be a lifesaver in emergencies. It is important to consider multiple factors like the cost, compatibility, technical knowledge and expertise required, safety, and durability before choosing a method. Be cautious and seek professional advice if necessary.

Step-By-Step Guide On How To Bypass The Crank Position Sensor

How To Bypass Crank Position Sensor: A Complete Guide

Dealing with a bad crank position sensor can be quite frustrating, especially when it comes to starting up your vehicle. But don’t worry, we’ve got you covered. In this guide, we will walk you through the step-by-step process to bypass the crank position sensor and get your vehicle back up and running.

Step 1: Preparation

Before beginning, it is essential to have the right tools and equipment to remove and bypass the crank position sensor. Here are the necessary preparations required:

  • Make sure you have a socket set and ratchet to remove the sensor.
  • Gather your safety glasses, work gloves, and a clean cloth.
  • Ensure your vehicle is parked on a level surface.
  • Disconnect the negative battery cable to prevent any electrical mishaps.

Step 2: Disconnecting The Crank Sensor

The crank position sensor is typically located near the crankshaft pulley in the engine block. Follow these steps to remove and bypass the sensor:

  • Firstly, locate the crank position sensor and disconnect the electrical connector from the sensor by gently pressing the release tab and pulling the connector.
  • Secondly, remove the bolt holding the sensor in place using your socket and ratchet. Be cautious not to lose the bolt as it’s tiny.
  • Once you’ve removed the bolt, gently pull the sensor out of its housing. Some sensors may be more challenging to remove, but with a little patience and persuasion, it should come out quickly.
  • Ensure that the sensor’s wire is not hanging loosely by securing it firmly with a cable tie or a piece of tape.
  • Finally, clean the area where the sensor was installed using a dry cloth to eliminate any debris that may hinder your vehicle’s operation.

Step 3: Job Completion

With the crank position sensor now bypassed, it’s time to close up the hood and gear up for starting your vehicle. Here are the remaining steps to complete the job.

  • Connect the negative battery cable back to its original position.
  • Ensure the area around your vehicle is cleared and out of harm’s way.
  • Start up your vehicle and ensure the engine runs smoothly.
  • Take your vehicle for a short test drive to verify the bypass worked correctly.
  • Monitor your vehicle’s performance for a while to ensure the bypass was successful.

Step 4: Starting Up The Vehicle

You’ve done it! Your vehicle is now starting up without needing a crank position sensor. Keep in mind that while the bypass is a quick fix, it is strongly advised that you get the sensor replaced as soon as possible to prevent future complications.

Bypassing the crank position sensor may be a daunting task, but the results will be rewarding when you see your vehicle starting without any problems. Follow the steps outlined in this guide, and you’ll be on your way to resolving your crank position sensor issues quickly and efficiently.

Troubleshooting And Maintenance For Bypassed Crank Position Sensor

How To Know If The Bypass Is Successful

There are some tell-tale signs to know if your bypass was successful. Here are a few things you should look out for:

  • The check engine light should go out as soon as you bypass the crank position sensor.
  • The engine should start without any delay.
  • The overall performance of the engine should be smooth and seamless.

Possible Issues After The Bypass

While bypassing the crank position sensor can be a cost-effective solution, it’s not without its faults. Here are a few issues you might encounter after the process:

  • Difficulty starting the engine: Sometimes, the engine may have trouble starting due to timing issues.
  • Decreased fuel efficiency: As the engine is not performing optimally, it can lead to decreased fuel efficiency and more trips to the pump.
  • Engine damage: Bypassing the crank position sensor can lead to an out-of-sync ignition system, which can damage the engine over time.

Maintenance And Care For Bypassed Sensors

If you decide to bypass your crank position sensor, there are some things you can do to keep your vehicle running smoothly:

  • Regularly check the timing: It’s important to ensure that the timing is correct to avoid engine damage.
  • Keep an eye on the check engine light: If you notice any warning signs, take the car to a mechanic immediately.
  • Regular tune-ups: Regular tune-ups can help maintain the engine’s performance and prevent future issues.

With proper maintenance and care, you can keep your engine running smoothly, even after bypassing the crank position sensor.

Frequently Asked Questions On How To Bypass Crank Position Sensor

How Do I Bypass A Crank Position Sensor?

Bypassing the crank position sensor involves unplugging the sensor and connecting its circuit’s wire to the car’s battery using a jumper wire.

What Are The Signs Of A Bad Crank Position Sensor?

A failing or bad crank position sensor can cause stalling, backfiring, rough idling, difficulty starting, or lack of acceleration.

Can A Car Run Without A Crank Position Sensor?

No, the car won’t work without a crank position sensor, and the engine control module will have no information on where and when to inject fuel.

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

The price to replace a crank position sensor range from $150 to $350. However, the cost could be higher if there are other underlying issues or if the car requires special parts.

Which Vehicles Are Most Likely To Have A Failing Crank Position Sensor?

Most modern cars that have electronic fuel injection systems have crank position sensors, and they are prone to failure. However, some common models that have issues with failing no-start or stalling sensors include jeeps, chryslers, and dodges.


After following the above steps, you can bypass the crank position sensor in your vehicle. It is essential to note that this process should only be used for emergency purposes and it is always advisable to replace the sensor when possible.

However, being able to bypass the sensor can come in handy when you are stranded and unable to access a replacement. It is crucial to follow the steps carefully to avoid causing damage to your engine or other components in your vehicle.

Remember, safety comes first, and it is essential to have a basic understanding of your vehicle’s engine and electrical systems before attempting any repairs. With these tips, you can now bypass the crank position sensor and get back on the road quickly, safely, and efficiently.

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