Bosch error 890: ABS warning lamp fault
The ABS unit has detected a problem with the ABS warning lamp circuit (the lamp on the display or handlebar). ABS may still work, but because the lamp cannot warn you, Bosch treats it as a fault to be fixed.
| Drive system | Bosch BES2 & BES3 |
| Severity | Dealer needed |
| Keep riding? | Ride with caution |
| Typical cost | A lamp or cable is 20-50 EUR/USD plus labour. |
Likely causes
- Loose or damaged lamp connector
- Lamp cable chafed
- Failed lamp LED
- Display not reporting the lamp state correctly
How to fix Bosch error 890
- Check the lamp connector and cable
- Restart and see whether the lamp lights briefly at start-up (it should)
- If the lamp never lights or the code persists, a dealer must test the lamp circuit
Warranty: The ABS module is a Bosch component with the same 2-year warranty as the rest of the system; damaged sensor cables or bent sensor brackets from crashes are not covered.
Typical cost: A lamp or cable is 20-50 EUR/USD plus labour.
Frequently asked
Can I reset Bosch error 890 myself?
Only by fixing the connection and restarting.
Can I keep riding with error 890?
Usually, but with reduced or interrupted assistance and the risk of the system shutting down mid-ride. Ride home carefully or on muscle power alone; do not plan long rides until the cause is found.
Is error 890 covered by warranty?
The ABS module is a Bosch component with the same 2-year warranty as the rest of the system; damaged sensor cables or bent sensor brackets from crashes are not covered.
Related Bosch codes
Manuals and video
- Bosch eBike Help Center: official error-code index
- Bosch eBike downloads: quick start guides and battery guide
- Bosch eBike dealer search (DiagnosticTool readout)
Not an official Bosch document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.