How To Fix The Pedal Assist Sensor On My E-Bike?

Last Updated on November 27 2022 by Sam

How To Fix The Pedal Assist Sensor On My E-Bike?


E-bikes are becoming increasingly popular because they provide a convenient way to get around without using fossil fuels. They also allow riders to travel farther distances and cover greater distances per hour.

However, these bikes come with their challenges. One of them is the pedal assist sensors. These sensors measure the force exerted on the pedals and determine whether or not the rider is pedaling. If the bike senses that the rider isn't pedaling, then it automatically assists.

To fix the Ebike PAS sensor issues, first, ensure that the distance between the magnet attached to the pedal and the sensor is precise. Also, check for any problems in the rest of the bicycle that might affect the operation of the Pedal Assist System (such as the front and rear brake systems).

What Is A Pedal Assist?

Pedal assist is an operating mode on an electric bike where once it is activated, the motor kicks in while you are pedaling.

Designed to help you pedal easier, pedal assist has varied settings that will allow you to effortlessly ride along at your desired speed. Once pedal assist is turned on, you will feel a little extra ‘oomph' propelling you forward, making it easy to ride long distances without getting tired or sore the next day.

Common Issues And Steps to Fix Them

Pedal cadence sensors are extremely important in an electric bike. Without them, we wouldn't be able to ride our bikes without pedaling.

However, there are times when the sensor malfunctions and causes issues. You can simply fix these issues on your own or consult a certified and reputable bike mechanic.

Here are the most common ones and the steps to fix them.

1. Front Or Rear Brake Issue

This electric bike issue sounds pretty serious, but fortunately, it's very simple to solve. You'll simply need to remove the front or rear brake cables and reconnect them. Once you do that, the bike should start moving again.

Another way to test whether the brakes are causing the pedal assist sensor to stop working is to disconnect the front or rear brake cable and then press the crank counterclockwise. If the motor starts moving without either of the brakes being pressed, then the problem lies with the brakes.

You can also check the sensor LED light to see if it's constantly lit up. If it is, then the problem is most likely with the brakes.

2. Magnet Issue

This electric bike pedal assists sensor issue is pretty common among e-bikes. You may find that there is no power output at all if the magnet is too close to the sensor. There are two main reasons for this:

  1. The magnet doesn't generate enough magnetic field strength
  2. The magnet moves away from the sensor.

To fix this problem, you'll need to adjust the position of the magnet relative to the sensor. The closer the magnet is to the sensor cadence, the stronger the magnetic field generated by the magnet. As long as the magnet stays within 3mm of the sensor, the sensor connection should work fine.

You can test whether the magnet is moving away from the sensor by placing the bike on its side and seeing if the magnet falls off the sensor. If the magnet does fall off, then the magnet needs to be moved further away from the sensor.

3. Bike Cut Out Due To Increased Pedal Assist Sensor Speed

When you ride an electric bike, there may come a point where the electric bike cuts off while increasing the speed. This happens when the magnet or sensor is not installed in place correctly.

To solve this issue, you must make sure the sensor and magnet are properly installed, and you can do that by using cable ties.

You may also run into another problem if the sensor or magnet moves during operation. This causes the sensor to able to no longer send the signal to the control unit correctly.

To solve the problem, you should make sure the sensor and magnets are installed properly, and you can do so by using cable ties.

4. Sensor Cable Issue

If your pedal assist sensor isn't working properly, check that the cable is plugged in correctly and that it's not damaged. Also, if you notice any issues with the voltage coming out of the battery pack, you'll want to replace the battery pack.

To test whether the cable is plugged in properly, plug the end of the cable into the connector on the bottom of the controller. Then, connect the other end of the cable to the sensor. If the light turns green, then the connection is correct.

Check the voltage coming out of your battery pack. If it's low, then you'll want to replace your battery pack.

5. Throttle Issue

If you've ever had issues with your pedal assist sensor, then you know how frustrating it can be. You'll probably find yourself trying to figure out if the issue is with the throttle itself or with the PAS.

To fix the issue, you'll need to disconnect the throttle cable and test the PAS. If you still experience problems, then there might be a problem with the throttle control.

You can also check the battery voltage to see if it's low. If it's below 12 volts, then you'll need to charge the battery. Otherwise, you'll need to replace the battery.

How Do I Test The E-Bike PAS Sensor?

To test the pedal assist sensor on your e-bike, you'll need to remove the front and rear brakes. You can do this by removing the handlebar grips and pulling out the brake levers. Next, unplug the battery cable from the controller. Now, simply turn the cranks counterclockwise until the bike stops moving. Once the bike comes to a halt, you can now plug the battery cable back into the controller.

You may notice that the bike doesn't move at first. Don't worry; this is normal behavior. After you've removed the brakes, there isn't anything holding the bike down. As soon as the bike starts moving again, the pedals start working.

Now, if you'd like to test the PAS sensor on a regular bike, you'll need to pull out the front and rear brakes, unplug the battery connector and turn the cranks counter-clockwise until the bike comes to a stop.

Once the bike is stopped, you can reconnect the battery cable to the controller. You may notice that the bike won't move right away. This is normal behavior. As soon as the controller detects movement, the pedals will begin working.


Hi! my name is Sam Lawrence. I am a twenty-something year old cycling fanatic. I created this E-BikeReview.UK as a resource for people when shopping for an electric bike. My career in bicycles started when I was a child. I’ve always loved bikes. I started my own bike buying and selling business before I left school and have been running a very successful bike shop in Ledbury (west England) since I was 18 years old.

One comment on “How To Fix The Pedal Assist Sensor On My E-Bike?”

  1. If e scooters are being allowed and not able to employ PAS, Will they employ a throttle control or have pre select power levels like legal Ebikes. IF throttles ,will we now be able use them on our "legal" bikes?

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