Fault with motor phase winding

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

Quick answer

Error code 09 signifies a fault with the motor phase winding in Bafang eBikes. This issue prevents the motor from functioning, as the system detects that one or more of the motor's phase windings are not operating correctly. The diagnosis runs continuously when the system is powered on, and if the error persists, it indicates a serious problem requiring attention.

Stop riding Drive unit / motor 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 09, and the motor fails to operate.

Likely causes, ranked

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

#1 Loose or Damaged Motor Phase Wires

How to check: Inspect the motor cable connectors for any visible damage or loose connections.

#2 Faulty Motor

How to check: If connections are secure, the motor may need to be replaced.

Troubleshooting steps

Check Motor Connections

Tools: None easy

Inspect the motor phase wire connections for any damage or looseness.

If it passes →Proceed to check the motor.

If it fails →Replace or repair the damaged connections.
Replace the Motor

Tools: Basic hand tools intermediate

If the connections are intact and the error persists, the motor likely needs replacement.

If it passes →Clear the error code and test the system.

If it fails →Contact Bafang for professional assistance.

When to stop and get professional help

If the motor shows signs of physical damage or if troubleshooting steps do not resolve the issue.

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

More codes for H700

04 · The throttle has not returned to its correct position 07 · Over voltage protection 08 · Error with the hall sensor 10 · Overtemperature of motor 11 · Motor temperature sensor fault 12 · Over current of motor

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Sources & verification

Last verified: pending review Reviewed by: editorial team

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