Home › Bosch › Error 596

Bosch error 596: Communication error

Bosch BES2 & BES3Dealer neededRide with caution

A second communication error code with the same meaning as 595: a component dropped off the bus or answered incorrectly. Check the connectors first; if it recurs, a dealer needs to trace it.

Likely causes

How to fix Bosch error 596

  1. Power cycle the system with the battery out
  2. Reseat the display and remote connectors
  3. Check the light and drive unit plugs
  4. Dry the bike if it has been wet
  5. If recurring, book a dealer DiagnosticTool session
Go to a dealer if: A dealer with DiagnosticTool is needed when 596 keeps returning after connector checks.
Warranty: Dirty contacts, damaged cables and water ingress are treated as wear or user damage and are rarely covered; a genuine component fault within the 2-year warranty normally is.
Typical cost: Cable and connector repairs 20-80 EUR/USD plus labour; a failed component 150-1000 EUR/USD.
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 596 myself?

A restart clears it; a recurring 596 needs a dealer.

Can I keep riding with error 596?

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 596 covered by warranty?

Dirty contacts, damaged cables and water ingress are treated as wear or user damage and are rarely covered; a genuine component fault within the 2-year warranty normally is.

Related Bosch codes

595 · Communication error424 · Communication error between components422 · Drive unit connection problem

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