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.
| Drive system | Bafang CAN systems (M400/M500/M600/M620, DP C18 CAN, 850C/860C CAN) |
| Severity | Information |
| Keep riding? | Safe to keep riding |
| Typical cost | Free to ignore; display replacement EUR/USD 60-200. |
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
Manuals and video
Not an official Bafang document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.