Brose error 11: Battery Voltage Reading Too High
The drive system has measured a battery pack voltage above the upper working limit it expects. Motor support is cut immediately, so the bike will only roll under leg power, the speed reading drops to zero, and walk assist will not engage. The display continues to show code 11 until the system is power-cycled or a dealer clears it.
| Drive system | Brose Drive (S, T, C - also used by Bulls, Rotwild, Fantic, BH, Trek Allant) |
| Severity | Dealer needed |
| Keep riding? | Do not keep riding |
| Typical cost | Expect a dealer diagnostic around 40 to 80 EUR; a replacement Brose battery typically runs 500 to 900 EUR, a charger 80 to 180 EUR, and a harness or cradle repair 30 to 120 EUR depending on the model. |
Likely causes
- Defective cell or BMS in the battery reporting an inflated pack voltage.
- Damaged, bent, or corroded contacts between battery and frame causing a false high reading.
- Use of a non-original or faulty charger pushing voltage above spec into the pack.
- Loose or pinched wiring in the battery harness or display cable sending a wrong signal.
- Moisture ingress in the battery cradle or motor connector altering the voltage sense line.
- Firmware mismatch between battery and drive unit after a partial update.
- Faulty display or control unit on bikes that route sense lines through the remote.
How to fix Brose error 11
- Stop riding and switch the system off using the control panel button.
- Remove the battery and visually inspect both the pack contacts and the frame cradle for dirt, moisture, bent pins, or corrosion; clean or dry as needed.
- Check the charger, its plug, and the wall socket for damage or a green LED that should not be lit.
- Reinsert the battery firmly and power the system on; if the code clears, ride briefly to confirm it does not return.
- Do not charge the battery again until the cause is found; a repeated over-voltage event can damage cells.
- If code 11 reappears, leave the system off and contact your e-bike dealer for diagnostic and a firmware or component check.
- A dealer will run a Brose diagnostic, compare pack voltage against BMS logs, and replace the battery, harness, or display as indicated by the readout.
Warranty: A genuine BMS, harness, or charger fault within the first two years is normally treated as a manufacturer defect and covered under warranty, while water ingress, crash damage, and use of a non-approved charger are excluded.
Typical cost: Expect a dealer diagnostic around 40 to 80 EUR; a replacement Brose battery typically runs 500 to 900 EUR, a charger 80 to 180 EUR, and a harness or cradle repair 30 to 120 EUR depending on the model.
Frequently asked
Can I reset Brose error 11?
Yes, power the bike off with the control panel button, remove the battery for a few seconds, then switch the system back on. If the code returns immediately or during the next ride, the fault is still present and a reset will not cure it.
Is it safe to keep riding with error 11?
No, motor support is disabled and continuing to ride risks the over-voltage condition damaging cells or the drive unit. Push or transport the bike home or to a workshop rather than riding under power.
How much will the repair cost and is it a warranty case?
A diagnostic runs 40 to 80 EUR and a new battery is 500 to 900 EUR, so total repair often falls between 100 and 900 EUR. If the battery, harness, or charger is found defective within two years and no non-approved charger or crash damage is involved, the manufacturer usually covers the part under warranty.
Related Brose codes
Manuals and video
Official source: Brose error code table, Pedego dealer service guide
Not an official Brose document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.