Bosch E-Bike Error Code 602 (Internal Battery Fault): Meaning + Next Steps

Byhenry

TL;DR

Bosch error code 602 indicates an internal battery fault. Official guidance: restart; if it persists, contact a Bosch eBike dealer.

Do this first:
1. Restart the system (off → wait 10–20 seconds → on).
2. If it returns, avoid repeated high-load rides until the battery is tested.
3. Contact a Bosch eBike dealer if it persists (battery diagnostics).

What this code means (Bosch official intent)

Bosch error code 602 indicates an internal battery fault. Official guidance: restart; if it persists, contact a Bosch eBike 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

  • Does it happen under load (steep climbs) or at startup?
  • Are battery contacts clean and the pack firmly latched?
  • If you have a second battery, test to compare.

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 battery fault requiring dealer diagnostics.
  • Voltage drop from poor contact (can mimic internal faults).
  • Battery aging/health issue.

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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