If your e-bike’s throttle is working but the pedal assist is not responding, it’s likely a simple issue that can be fixed easily. Here are the common reasons for this problem and how you can resolve it.

Before starting any work, make sure to remove the battery first.

1. Loose or Dislodged Cadence Sensor

One of the most common causes of pedal assist issues is a loose or dislodged cadence sensor. The cadence sensor is responsible for detecting your pedaling motion and signaling the controller to provide motor assistance.

• Check the cadence sensor: Inspect the sensor near your bike’s crankset. If it has popped off or shifted out of place, it won’t be able to detect your pedaling.

• Fix the sensor: Gently push the loose cadence sensor back into its proper housing. Make sure it’s securely snaged in the bottom brackets. Once it’s in place, test your pedal assist to see if it’s working again.

Note: If the cadence sensor was recently dislodged and your pedal assist stopped working, this simple fix is often all you need.

2. Loose Connector Between Controller and Cadence Sensor

If the cadence sensor is properly in place but the pedal assist still isn’t responding, the problem could be a loose connection between the controller and the sensor.

• Inspect the wiring: Check the connector between the controller and the cadence sensor. It’s possible that this connector has become loose or unplugged.

• Reconnect the wiring: Make sure the connector is fully plugged in and secured. Push the connector all the way in to ensure a solid connection. After reconnecting, test your pedal assist again.

The connector is located inside the controller housing. For detailed instructions on accessing and identifying the connector, please refer to the article: How to Replace the Hub Drive Motor Controller on Your Electric Bike

3. Malfunctioning Cadence Sensor

If the previous steps haven’t resolved the issue, it’s possible that the cadence sensor itself is malfunctioning. The cadence sensor is responsible for detecting your pedaling and activating the pedal assist. If it’s damaged or faulty, it may need to be replaced.

• Replace the cadence sensor: If the sensor is indeed faulty, you’ll need to replace it. Please refer the article :How to Replace the Cadence Sensor on Your Electric Bike

After replacing the sensor, test your pedal assist to confirm that everything is working properly.

4. Malfunctioning Controller

If neither the sensor nor the connector is the issue, the controller itself might be malfunctioning. The controller manages the power flow from the battery to the motor, including controlling the pedal assist function.

• Replace the controller: If the controller is faulty, it may need to be replaced. Please refer to our How to Replace the Hub Drive Motor Controller on Your Electric Bike for detailed steps on how to do this.