Torque signal fault

Stop riding Last verified: pending review Reviewed by: editorial team

Quick answer

Error code 25 indicates a torque signal fault, which prevents the motor from functioning. This issue arises when the torque sensor, responsible for measuring the force applied on the pedals, fails to send the correct signal to the controller.

Stop riding Sensor Often DIY-friendly Intermediate (30–60 min)

Does this apply to your bike?

H700 · Bafang · Common displays: DP E171

Heads-up: the same number can mean different things on other systems — always check your drive system first. Browse all drive systems →

What you’ll notice

The display shows error code 25, and the motor does not work.

Likely causes, ranked

Start at #1 — causes are ordered by how often they turn out to be the problem.

#1 Faulty Torque Sensor Connection

How to check: Inspect the torque sensor cable and connectors for damage or corrosion.

#2 Damaged Torque Sensor

How to check: Connect the pedelec to the BESST and check the torque sensor signal.

#3 Controller Issue

How to check: Use BESST to update the controller and check if the system returns to normal.

Troubleshooting steps

Check Torque Sensor Connection

Tools: None easy

Inspect the torque sensor cable and connectors for loose or damaged connections.

If it passes →Proceed to check the torque sensor signal.

If it fails →Repair or replace the damaged connection.
Check Torque Sensor Signal

Tools: BESST intermediate

Connect the pedelec to the BESST and verify the torque sensor signal.

If it passes →Proceed to update the controller.

If it fails →Replace the torque sensor.
Update Controller

Tools: BESST intermediate

Use BESST to update the controller software.

If it passes →Check if the system operates normally.

If it fails →Replace the torque sensor.

When to stop and get professional help

If the motor does not operate after following all steps, consult a professional.

Never open, puncture, or disassemble the battery pack, and never bypass the BMS. See our safety guide.

More codes for H700

14 · Overtemperature of controller 15 · Controller temperature sensor fault 21 · Speed sensor fault 26 · Torque sensor speed signal fault 27 · Over current of the controller 30 · Communication failed

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Sources & verification

Last verified: pending review Reviewed by: editorial team

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