Brose error 45: Motor rotation signal corrected by software
The drive unit detected an irregular reading from the internal rotation sensor (the part that tells the controller how fast the motor is spinning) and the firmware applied an automatic correction. In practice the assist drops out, the speed readout can briefly freeze at zero and the walk-assist button stops working until the system is restarted. A single occurrence is often a one-off glitch; repeated occurrence points to a real sensor fault.
| Drive system | Brose Drive (S, T, C - also used by Bulls, Rotwild, Fantic, BH, Trek Allant) |
| Severity | Warning |
| Keep riding? | Ride with caution |
| Typical cost | Expect a diagnostic fee of around 30 to 60 EUR, a Hall sensor or cable repair in the region of 120 to 280 EUR, and a full motor service or replacement between 450 and 900 EUR depending on the Brose model fitted. |
Likely causes
- Loose or oxidised motor connector under the frame or bottom bracket area
- Damaged or pinched cable between the motor and controller, often near the down tube routing
- Contamination or water ingress inside the motor affecting the rotor position feedback
- Worn or misaligned rotor magnet ring on the crankshaft
- Internal Hall sensor failure inside the drive unit
- Firmware mismatch after a recent update on the display or battery
- Crash or impact shock that disturbed the motor mounting
How to fix Brose error 45
- Stop the bike in a safe place and switch the system off using the control panel button.
- Wait at least 10 seconds to let the controller fully power down.
- Switch the system back on and check whether the warning has cleared on the display.
- Do a short low-speed test ride to confirm that assist and walk mode work normally.
- If the warning returns, switch off again, remove the battery and inspect the main motor connector for seating, dirt or green corrosion; clean with contact spray if needed.
- Check the visible motor cable for chafing, kinks or crushed sections along the frame.
- If the code reappears after a second restart, stop riding and book the bike in with an authorised Brose service dealer for a software readout and motor diagnostics.
Warranty: A genuine internal sensor or motor fault inside the statutory two-year warranty window is normally covered as a manufacturer defect, while water ingress, crash damage and wear-related cable failures are typically excluded.
Typical cost: Expect a diagnostic fee of around 30 to 60 EUR, a Hall sensor or cable repair in the region of 120 to 280 EUR, and a full motor service or replacement between 450 and 900 EUR depending on the Brose model fitted.
Frequently asked
Can I reset brose error 45 myself?
Yes. Switch the system off with the control panel button, wait around ten seconds, then switch it back on. If the warning clears and does not return within a short ride, the reset has worked. If it comes back, a dealer diagnostic is the next step.
Is it safe to keep riding with brose error 45?
You can ride cautiously to get home or to the workshop if assist returns after the restart and the motor behaves normally. Stop riding and arrange transport if the warning reappears, the motor cuts out under load, or you notice any burning smell or grinding noise.
How much does fixing brose error 45 cost and is it warranty?
On a bike under two years old with no signs of water damage or impact, the repair is usually treated as a warranty claim at no cost to the owner. Out of warranty, a dealer diagnostic plus a sensor or wiring repair typically runs 120 to 350 EUR, and a full motor replacement can reach 700 to 900 EUR.
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.