Bafang error 81: Bluetooth module error
Bafang CAN systems (M400/M500/M600/M620, DP C18 CAN, 850C/860C CAN)InformationSafe to keep riding
The Bluetooth module in the display or controller is not responding. The app cannot connect, but the bike rides normally.
Likely causes
- Module firmware crash
- Module hardware failure
- Water in the display
- Firmware mismatch after a display update
How to fix Bafang error 81
- Power cycle the bike and restart the app/phone Bluetooth
- Forget the bike in the app and pair again
- Have the dealer update the display firmware
- Replace the display if the module is dead
Go to a dealer if: Go to a shop only if you need the app; the drive is unaffected.
Warranty: Bafang parts are usually sold through dealers or online resellers; warranty is typically 1-2 years via the seller, and this code alone is rarely a warranty claim.
Typical cost: Free to ignore; display replacement EUR/USD 60-200.
Warranty: Bafang parts are usually sold through dealers or online resellers; warranty is typically 1-2 years via the seller, and this code alone is rarely a warranty claim.
Typical cost: Free to ignore; display replacement EUR/USD 60-200.
Still stuck? Take a photo of the display and show it to a local e-bike workshop. Bring the bike's system name (e.g. Bosch Performance Line CX) and the exact code; that saves diagnostic time and money.
Frequently asked
Can I reset error 81?
Power cycle; a stuck module usually recovers.
Can I keep riding?
Yes, with no impact on assist.
Warranty?
Yes within the display warranty.
Related Bafang codes
Not an official Bafang document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.