Bafang error 43: Battery cell power too high
Bafang CAN systems (M400/M500/M600/M620, DP C18 CAN, 850C/860C CAN)Dealer neededDo not keep riding
The BMS reports that one or more cell groups are delivering power outside their safe limits. This is a battery-internal protection and the pack will cut power.
Likely causes
- BMS fault or unbalanced cell groups
- Damaged cells after a drop or water ingress
- Extreme load on an aged pack
How to fix Bafang error 43
- Remove the battery, let it rest and recharge fully
- Power cycle and test on low assist
- Have the battery diagnosed with the manufacturer's tool; do not open the pack yourself
Go to a dealer if: Go to a shop or the battery manufacturer straight away; cell-level faults are not a home repair.
Warranty: Battery warranty applies unless physical damage is evident.
Typical cost: BMS repair EUR/USD 80-150; battery replacement EUR/USD 300-700.
Warranty: Battery warranty applies unless physical damage is evident.
Typical cost: BMS repair EUR/USD 80-150; battery replacement EUR/USD 300-700.
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 43?
A rest and recharge may clear it, but the underlying cell issue remains.
Can I keep riding?
No, a cell-level fault is a safety matter.
Warranty?
Yes within the battery 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.