Bafang error 35: 15V detection circuit error
Bafang CAN systems (M400/M500/M600/M620, DP C18 CAN, 850C/860C CAN)Dealer neededDo not keep riding
The controller's internal 15V supply (which drives the MOSFET gates and some sensors) is out of range. This is an internal controller hardware fault. The bike typically refuses to give assist and shows the code at every start.
Likely causes
- Failed voltage regulator on the controller board
- Water damage on the controller
- Controller damaged by a battery over-voltage event
- Short on a sensor supply line pulling the internal rail down
How to fix Bafang error 35
- Power cycle once to exclude a glitch
- Unplug the peripherals one at a time (light, throttle, sensors) and power on; if the code clears, the last unplugged part is shorting the supply
- Check for water in the controller housing
- Replace the controller if the code persists with all peripherals unplugged
Go to a dealer if: Go to a shop; this is a controller-level fault and needs replacement or board repair.
Warranty: If the bike or kit is under warranty (usually 1-2 years via the seller), contact them before opening anything, as opened motors and controllers can void the claim.
Typical cost: Controller EUR/USD 100-300 including fitting.
Warranty: If the bike or kit is under warranty (usually 1-2 years via the seller), contact them before opening anything, as opened motors and controllers can void the claim.
Typical cost: Controller EUR/USD 100-300 including fitting.
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 35?
No, not if the internal supply is faulty.
Can I keep riding?
No assist will be available; pedal home.
Warranty?
Yes, an internal supply failure is a controller defect.
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.