Brake detection circuit is fault

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

Quick answer

Error Code 33 signifies a malfunction in the brake detection circuit of the eBike system. This issue can prevent the motor from functioning correctly, as the system relies on accurate brake signals for safe operation.

Stop riding Other Often DIY-friendly Beginner (15–30 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 33, and the motor may not operate as expected.

Likely causes, ranked

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

#1 Brake detection circuit fault

How to check: Inspect the brake lever and associated wiring for damage or disconnection.

Troubleshooting steps

Inspect brake lever and wiring

easy

Check the brake lever and wiring for any visible damage or disconnections.

If it passes →If no damage is found, proceed to check connections.

If it fails →Replace damaged components or reconnect as necessary.
Check connections

easy

Ensure all connectors related to the brake detection circuit are secure and free of corrosion.

If it passes →If connections are secure, test the system.

If it fails →Repair or replace any faulty connectors.
Test the system

easy

Power on the eBike and check if the error code persists.

If it passes →If the error code is cleared, the issue is resolved.

If it fails →Contact a professional for further diagnostics.

When to stop and get professional help

If you notice any physical damage to components or persistent error codes after checking.

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

More codes for H700

26 · Torque sensor speed signal fault 27 · Over current of the controller 30 · Communication failed 35 · Detection circuit for 15V has an error 36 · Detection circuit on the keypad has an error 37 · WDT circuit fault

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Sources & verification

Last verified: pending review Reviewed by: editorial team

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