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Bosch error 890: ABS warning lamp fault

Bosch BES2 & BES3Dealer neededRide with caution

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.

Likely causes

How to fix Bosch error 890

  1. Check the lamp connector and cable
  2. Restart and see whether the lamp lights briefly at start-up (it should)
  3. If the lamp never lights or the code persists, a dealer must test the lamp circuit
Go to a dealer if: A dealer with DiagnosticTool is needed when the lamp does not light at start-up or the code persists.
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.
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 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

800 · Internal ABS fault870 · ABS communication error

Not an official Bosch document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.