How To Start A Car With A Bad Crankshaft Sensor

How To Start A Car With A Bad Crankshaft Sensor

The sensor of the crankshaft is also known as the crankshaft position sensor. It measures the position of the crankshaft and sends the signals to the ECU to calculate the injection timing, ignition timing, and engine RPM.

The function of the crankshaft position sensor is to locate the crankshaft position with the help of the reference point created because of the absence of teeth in the reluctor’s ring to identify the number of rotations of the crankshaft.

Sometimes the crankshaft sensor may go down and the car would not be able to start which arises the need to start the vehicle with such a sensor. In this powerful article, we will discuss how to start the engine of a car with a defective crankshaft sensor.

How To Start A Car With A Bad Crankshaft Sensor

Crankshaft Position Sensor Replacement
Crankshaft Position Sensor

I am sad to say that you cannot start a car with a bad crankshaft sensor; the car will crank but will not start. You need to replace the defective crankshaft position sensor with a new sensor to start and prevent damage to your car.

When the crankshaft position sensor goes wrong, the ECU won’t see the crankshaft moving. As a result, the ECU will not switch ON coils and will not allow fuel for combustion. Hence, the car fails to start.

The crankshaft position sensor is essential in every car model. Its signal is required for the ECU to decide the ignition timing and regulate the fuel injection process.

The ECU needs a crankshaft signal to determine when to inject the fuel into the combustion chamber. If there is no crankshaft signal, there would be no signal sent forward by the crankshaft position sensor to Electronic Control Unit (ECU) to drive your car.

The ECU will assume that the engine is not cranking and will not inject fuel into the combustion chamber, and there would be no spark in the engine. As a result, if you try to start your car the car with a bad crank sensor will not start.

The crankshaft position sensor measures the speed of the car. When the Crankshaft Sensor goes bad, the readings sent to the car’s electronic control unit (ECU) will not sync in the database of the ECU.

This asynchronous pattern of crankshaft position readings between the sensor and the database can cause damage to your car. Hence, modern vehicles are designed to activate a no-start condition in the car to protect your vehicle from any damage if you want to start the car in such conditions, the car won’t start

Therefore, you should consult a mechanic and get your car repaired, but there could be situations where you must get your car started before getting it fixed.

Such as, If you are in a situation where you need to start your engine and do not have access to a mechanic, you may be able to temporarily bypass the crankshaft position sensor to get the car running. However, this is a complex procedure and should only be attempted by someone with a thorough understanding of automotive systems and who knows about working on the car. It is also important to note that bypassing the crankshaft position sensor is only a temporary solution and the sensor should be replaced as soon as possible to avoid further problems.

if you get stuck on your way and could not find a mechanic nearby, here’s a guide of steps on how to start a car with a bad crankshaft sensor:

  • Locate the ckp sensor to access the sensor in your vehicle.
  • Pull the sensor connection, observe it, clean it also clean the area near the crankshaft sensor, and reconnect it.
  • Then go back and try to start your vehicle again; you might face a total of three conditions.

Condition 1: You might be able to start the car.

Condition 2: Your car will start and likely not start after some time. If this happens, it might indicate that your car’s engine is not receiving fuel and that there is some problem with the vehicle’s fuel pump.

Condition 3: If the vehicle with a bad sensor does not start at all after following the procedure mentioned above wholly, it can also indicate that the car’s spark plug is not producing current. At this time, you have no option other than tow the vehicle to another vehicle to get it checked and repaired.

Related Post: Temporary Fix For Crankshaft Position Sensor: Is It Possible

How Does the Crankshaft Position Sensor Work to Improve Fuel Efficiency

The crankshaft sensor work to improve fuel efficiency in a few ways. First, it helps the engine control module (ECM) determine the precise timing of the ignition and fuel injection, which can optimize the combustion process and reduce fuel consumption.

Second, due to a crankshaft sensor, ECM can use the information to adjust the engine’s operating parameters in real time, such as adjusting the valve timing or activating fuel-saving features like a cylinder deactivation system. By allowing the ECM to make these adjustments, the crankshaft position sensor can contribute to better overall fuel efficiency.

Why it’s Important to Know Where is Crankshaft Position Sensor Located

The crankshaft sensor is usually located at the back of the engine. It is typically mounted on or near the crankshaft and it uses a reluctor wheel or tone ring on the crankshaft to generate a signal as the crankshaft rotates. The sensor then sends this signal to the engine control unit (ECU), which uses it to determine the position and speed of the crankshaft and adjust the ignition timing and fuel injection accordingly. So, it is important to know where your crankshaft position sensor is located for a few reasons:

  • It Can Help You Diagnose Issues With The Sensor: if you are experiencing problems with your vehicle, you need to locate the sensor to help you determine if it is the cause of the issue.
  • It Can Make It Easier To Simply Replace The Sensor: if you observe signs of a faulty crankshaft sensor, then you will need to replace the crankshaft position sensor. Knowing its location can make the job easier and quicker.
  • It Can Help You Understand How The Sensor Works: understanding the location of the crankshaft position sensor can give you a better idea of how it functions and how it interacts with other systems in the vehicle.

Overall, knowing where the crankshaft position sensor is located can be useful for both maintenance and troubleshooting purposes. It is a good idea to familiarize yourself with the location of this important component in your vehicle.

Related Post: Crankshaft Position Sensor Location

What Are The Symptoms Of a Bad Crankshaft Position Sensor

Bad Crankshaft Position Sensor Symptoms

A bad crankshaft sensor can cause a variety of problems in your vehicle. Some common symptoms of a bad crankshaft sensor include:

  1. Lighting Up Of The Check Engine Light
  2. A Problem In Starting The Car
  3. Rough Idle
  4. Misfiring Of The Engine
  5. Unsteady Acceleration
  6. Stalling Of The Car
  7. Reduced Gas Mileage

Related Post: Top 7 Symptoms Of A Bad Crankshaft Position Sensor

Is Your Car Warning You About a Bad Crankshaft Position Sensor

A car may warn you about a bad crankshaft sensor in a variety of ways, including the following:

  • The Engine Fails To Start Or Is Having Difficulty Starting: a faulty crankshaft position sensor might prevent the engine from starting or cause it to start and then stall.
  • The Check Engine Light Is ON: a defective crankshaft position sensor can trigger the check engine light to come on.
  • The Engine Misfires Or Runs Poorly: a bad crankshaft sensor can cause the engine to run poorly or misfire, as the sensor is responsible for providing the engine control module with information about the position of the crankshaft.
  • The Engine Hesitates Or Stumbles When Accelerating: a failing ckp sensor can cause the engine to hesitate or stumble when you try to accelerate.
  • The Transmission May Not Shift Correctly: the working of the transmission is affected due to crankshaft sensor failure. Transmission of the shaft may not shift correctly if the crankshaft sensor is failing.

It’s worth noting that if the crankshaft sensor is bad, it’s likely that the automobile won’t start. The crankshaft sensor is an important component that provides crucial information to the engine control module, so if the crankshaft position sensor is bad, you may not be able to start your car, or may not run correctly.

Can A Bad Crank Sensor Drain The Battery?

Crankshaft Position Sensor

The crankshaft sensor itself does not drain the battery. However, a defective crankshaft position sensor creates other issues that may result in a drain on the battery.

For example, if the crankshaft sensors are loose and not functioning properly, it may cause the engine to not start or to start and then stall. This can cause the battery to be drained, especially if the starter motor is repeatedly turning over without the engine starting.

Additionally, the crankshaft sensor can fail to send the correct information to the engine control module, which may cause other systems in the vehicle to malfunction. This can also result in a drain on the battery.

It’s worth noting that a defective crankshaft position sensor is just one possible cause of a battery drain issue. There could be other issues that could be causing the battery to drain, such as a malfunctioning alternator, a parasitic drain on the electrical system, or a problem with the battery itself. To determine the cause of a battery drain issue, it is recommended to have the vehicle inspected by a mechanic.

Related Post: What Causes Crankshaft Sensor To Go Bad: 5 Reasons

The Consequences of Neglecting to Replace the Crankshaft Sensor

Neglecting to replace a bad crankshaft position sensor can have several consequences. Here are a few:

  1. Engine Performance Issues: Such sensors can cause the engine to run poorly or misfire, which can lead to a decrease in performance and fuel efficiency.
  2. Engine Damage: If the crankshaft position sensor is not functioning properly, it can cause the engine to run at incorrect speeds or timing, which can lead to internal engine damage.
  3. Increased Fuel Consumption: A defective crankshaft position sensor can cause the engine to run inefficiently, leading to increased fuel consumption.
  4. Difficulty Starting The Car: A bad ckp sensor can prevent the engine from starting or cause it to start and then stall, which can be frustrating and inconvenient.
  5. Transmission Issues: A defective crankshaft position sensor can also affect the transmission and cause it to not shift correctly.

It is important to replace a faulty ckp sensor as soon as possible to avoid these consequences and ensure that your vehicle is running smoothly and efficiently.


How long should a crankshaft sensor last?

The crankshaft sensor should last for the lifetime of the vehicle, as long as it is properly maintained and not subjected to excessive wear or damage. In some cases, the crankshaft sensor may fail due to age or exposure to harsh environments causes problems. It also depends on the type of sensor and model of the vehicle. However, failure chances increase for cars if used for more than 100,000 miles.

How to temporarily start the vehicle with the faulty sensor?

When you try starting the car and found that your crankshaft sensor is faulty, you must locate the crankshaft sensor to see the real problem. Remove the sensor from its mount clean it and attach it after cleaning the area around the sensor mount. Now your vehicle engine should start.

Can we replace the crankshaft sensor in the home?

If you understand what a crankshaft sensor is and you have learned how to start a faulty vehicle then you can perform this task at home. Otherwise, visit the mechanic immediately and get your crankshaft sensor checked by a mechanic depending on the car model because it is not safe to drive without a crankshaft sensor or faulty sensor. Once you’ve successfully replaced the crankshaft sensor then you are free to move.

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