Bosch E-Bike Error Code 490 (Internal Fault of the On-Board Computer): What to Do

Byhenry

TL;DR

Bosch error code 490 indicates an internal fault of the on-board computer. Official steps: have the on-board computer checked by a dealer.

Do this first:
1. Restart the system once (off → wait → on).
2. If the code returns, plan for dealer service—Bosch’s official guidance is to have the on-board computer checked.

What this code means (Bosch official intent)

Bosch error code 490 indicates an internal fault of the on-board computer. Official steps: have the on-board computer checked by a dealer.

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

  • Is the display behaving abnormally (black screen, missing graphics, freezes)?
  • Any recent rain/wash/pressure spray near the display mount?
  • If the display is removable, reseat it and restart.

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

  • Internal on-board computer/display fault.
  • Contact/pin issues at the display mount that mimic internal faults.
  • Moisture-related damage over time.

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-display-troubleshooting/
– https://jieli-electric.com/bosch-connection-communication-errors/

Notes (practical)

  • If you see corrosion or bent pins at the mount, fix the mount/contact issue before replacing parts.

Sources (official-first)

Similar Posts