Why Replaced Crankshaft Sensor Still No Start? (Solved)

In previous articles, we discussed camshaft problems. Typically, the camshaft aids in increasing vehicle horsepower or the replacement of both camshaft sensors. This is going to be a unique article. Let’s talk about the crankshaft sensor.

The crankshaft position sensor is a minor detail, but it is critical in calculating fuel injection time and ignition angle to ensure that the car engine system operates normally.

Sensors in automobiles, such as the crankshaft position sensor, are in charge of collecting signals from other parts and transmitting them to the central computer ECU. The ECU then controls the car’s parts so that they all work together smoothly, allowing the vehicle to run smoothly.

The engine would not be able to start without the crankshaft position sensor. Your car replaced crankshaft sensor still no start? So, what is the root cause?

In the following section, we’ll explain why replacing the crankshaft sensor still doesn’t get the car started. We also teach you how to recognize the symptoms of a faulty crankshaft sensor and how to replace it properly.

Replaced Crankshaft Sensor Still Not Start?

We believe the issue arises during the procedure for replacing the replacement crankshaft sensor.

One cause of the vehicle not starting could be that you disconnected the battery before replacing the sensor. The vehicle should not have been unable to start due to a new crankshaft sensor. The reason for the no-start problem is either a fuel or ignition problem with the car or something that happened during the crank sensor repair.

Check your sensor replacement processes at an auto repair shop to ensure everything is plugged in correctly. Check the ignition and fuel systems if the vehicle won’t start.

Furthermore, it’s possible that you haven’t reset your computer after installing the new crankshaft sensor. This is a crucial step, as the application will allow your car to function correctly once more. We’ll teach you how to reset the crankshaft sensor in two methods in the next section.

How to Reset Crankshaft Position Sensor?

You’ve spent a lot of money on a complete crankshaft repair, but you still can’t drive your trusty old car. If this is the case, and you’re seeking for a solution to reset the crankshaft position sensor without having to replace it, you’ll need more than simply a new one.

The pickup from the crank is read by this magnetic sensor in each of its rotations. This information is fed into your auto computer, which compares it to the database information to ensure that they are in sync.

Any time the computer detects out-of-sync data, an engine code is generated. And, if your automobile is current and intelligent enough, it will decrease the engine’s power to avoid harm.

As you can see, the sensor is in charge of measuring the magnetic field generated by each shaft turn. This detection can’t be reset, apparently. However, you can replace the sensor and program it to erase previously stored issue codes from the malfunctioning sensor and resync it to the current new sensor state.

This no-start issue can be remedied by resetting the sensor if your automobile shuts down without warning and stalling has become a fixture of your commute.

You will notice improved fuel mileage as a result of this, and it is also pretty affordable! Your vehicle will be thrilled when you replace and reset the sensor.

Using A Scanner To Reset The Crank Sensor

After successfully replacing the prior malfunctioning crank sensor, the Power Control Module, or PCM, must be resynced. If you skip this step, your PCM will be unable to detect the crankshaft’s position.

You can reset the positioning information in the memory of your car’s PCM memory and replace it with information from the new crankshaft sensor using the CKP Variation Learn method.

To begin, connect a system scanner to the vehicle’s computer. This ensures that the sensor’s memory contains no stored fault codes from the preceding sensor.

The DTC P1336 CKP Variation Not Learned signal is the only code you can have. If there is more than this, the car computer will turn off the relearning process until the problem that produced the error code is resolved.

Set the brakes, lock the driving wheels, and shut the hood.

Start your vehicle’s engine. Check the engine oil and coolant levels, the latter of which should be at 158F. Turn off the engine for ten seconds.

You should verify the Diagnostic Trouble Code, or DTC P1336, now that your engine has idled. 

What will you do if you are unable to learn the Case? Then, for more diagnostic information and actions, use the DTC P1336 CKP Variation Not Learned. Return to step 1 to see if any additional powertrain codes are interfering with the relearning process. If any of these codes are present, rectify them before continuing with the previous steps.

Crank Sensor Reset Without A Scanner

What if you wish to fix the crankshaft sensor without using a scanner? If you are unable to access the relearn through your scanner, you must follow the steps below.

Turn off all of the extras. Start the engine with the coolant and air temperature sensors within 5 degrees of each other.

Allow the engine to idle for 2 minutes in the Neutral or Park position.

Accelerate your car to 55 mph on part throttle. This speed can be maintained for up to 10 minutes. By then, the engine should have reached operational temperature.

Continue to cruise at the same speed for another 5-6 minutes after that.

Reduce your speed to 45 mph without braking and hold this position for one minute.

Conduct four such deceleration cycles, each lasting 25 seconds, without using the brakes or specifying a speed. In between those deceleration cycles, return to the 45 mph count for 15 seconds.

Next, increase your car’s speed to 55 mph and maintain it for another 2 minutes.

Finally, come to a complete stop and let your automobile idle for two minutes. With the clutch depressed, the transmission should be in Drive or Neutral.

Crankshaft Position Sensor Damage Symptoms

The engine may not start if the crankshaft position sensor is destroyed, and the speed will be uneven. The engine vibrates due to faulty ignition, excessive fuel consumption, and erratic acceleration.

The following are warning indicators that this sensor is damaged, so you can act quickly to repair it if it occurs.

1. Difficulty of Acceleration

When the engine accelerates, the ignition timing and injection time should be adjusted accordingly. However, without accurate information from the crankshaft position sensor, the ECU will be unable to make the necessary modifications. As a result, the engine will accelerate slowly or unevenly.

2. Fuel Consumption

Because the crankshaft position sensor inaccurately predicts the engine core location, fuel injection will be suboptimal without proper ignition timing information. As a result, the engine’s fuel consumption may be higher than typical.

3. Engine Loses Power and Vibrates

A damaged crankshaft position sensor prevents the ECU from receiving an engine signal. This results in improper ignition timing, which can result in one or more cylinders losing power. The engine will then vibrate and run unevenly in idle mode, which you will notice while sitting in the vehicle.

4. Starting Engine is Difficult or Impossible

The crankshaft position sensor will not deliver a signal to the ECU if it is entirely broken, making it difficult for the ECU to operate fuel injection and ignition. As a result, the car will not start.

5. Check Engine Light Illuminates

When the crankshaft position sensor is damaged, the check engine light may illuminate on the dashboard. There are situations, though, when you will notice the above signals before you see this light.

There are a variety of issues that can create symptoms similar to those caused by a damaged crankshaft position sensor. The above symptoms could indicate a problem with the ignition or fuel injection systems. You may need to perform some tests before concluding that the crankshaft position sensor is broken, but it is advisable to take the automobile to a garage.

Final Thoughts

We assisted you in determining the cause of your car’s failure to start following the replacement of the crankshaft sensor. At the same time, we offer alternatives to assist you in resolving the issue. I hope you found the information in this post useful. If you have any questions, please post them in the comments section below and we will respond as soon as possible.

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