Bafang Error Codes

Reviewed by certified eBike technicians · Last updated July 30, 2026

7 diagnostic codes for Bafang e-bike systems.

Error 30

Communication failure between display and motor controller

All BBS/BBSHD/M-Series Error 21

Speed sensor error — magnet misaligned or sensor faulty

All BBS/BBSHD Error 08

Hall sensor error inside the motor

BBSHD Error 30H

Controller overheat protection activated

BBS02 Error 07

Over current protection — motor current exceeded safe threshold, controller triggered protection circuit

BBSHD/BBS02/BBS03 Error 10

Motor Hall sensor error — controller cannot detect motor rotor position

BBSHD/BBS02/BBS03 Error 06

Overvoltage protection — battery voltage exceeds controller safe limit

BBSHD/BBS02/M-Series

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