Bosch E-Bike Error Code 591 (Authentication Error): Meaning + Fix Steps

Byhenry

TL;DR

Bosch error code 591 indicates an authentication error. Bosch’s official steps: power off, remove and reinsert the battery, restart; dealer if it persists.

Do this first:
1. Switch off the eBike system.
2. Remove the battery pack and reinsert it firmly.
3. Restart the system; if it persists, contact a Bosch eBike dealer.

What this code means (Bosch official intent)

Bosch error code 591 indicates an authentication error. Bosch’s official steps: power off, remove and reinsert the battery, restart; dealer if it persists.

Quick fixes (safe DIY first)

1) Proper restart (the Bosch way)

  1. Turn the system off.
  2. Wait 10–20 seconds.
  3. Turn the system on and re-check.

2) 60-second check

  • Battery fully seated and latched (no wiggle).
  • Battery contacts are clean and dry (no grit/corrosion).
  • If you have a second battery, test with it to isolate the issue.

3) If it started after rain / washing

  • Assume moisture at a connector/contact point.
  • Dry naturally, then re-check connectors (avoid pressure washing around the motor/display).

Most common causes

  • Battery not seated fully or intermittent contact.
  • Dirty/wet terminals preventing proper authentication.
  • Component authentication/config mismatch requiring dealer tools.

When to stop DIY and go to a Bosch dealer

Go to a dealer if:
– The code returns after a restart and basic checks.
– You find damaged wiring, bent pins, corrosion, or signs of water ingress.
– The official guidance for this code says dealer (many do).

Related guides on this site (closed-loop)

More troubleshooting (optional):
– https://jieli-electric.com/bosch-battery-troubleshooting/
– https://jieli-electric.com/how-to-clear-bosch-e-bike-error-codes/

Notes (practical)

  • If you notice a repeat pattern (bumps, climbs, rain), write it down—dealers can diagnose faster with that info.

Sources (official-first)

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