Bosch E-Bike Error Code 605 (Battery Temperature Error): Meaning + What to Do

Byhenry

TL;DR

Bosch error code 605 means the battery temperature is outside the permissible range. Let it return to a normal range, then restart.

Do this first:
1. Switch off the system.
2. Let the battery cool down or warm up to a safe/normal temperature range.
3. Restart; if it persists, contact a Bosch dealer.

What this code usually means

Bosch error code 605 means the battery temperature is outside the permissible range. Let it return to a normal range, then restart.

What you’ll typically notice

  • Assist may reduce or cut out.
  • The code may appear at start-up, after transport, after a wheel removal, or under load.
  • Sometimes the code clears after a restart—until the underlying issue returns.

Quick fixes (no tools 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) Do a 60-second visual inspection

  • Was the battery stored in a very cold car/garage before riding?
  • Was it charging in direct sun or a hot garage?
  • Do you see the code during charging vs during riding?
  • Is the battery unusually hot to the touch (stop charging if so)?

3) If it happens after rain / washing

  • Assume moisture at a connector or contact point.
  • Dry everything naturally and re-check connectors (don’t pressure-wash or blast heat).

Most common causes (ranked)

  • Battery too hot after hard riding or hot charging environment.
  • Battery too cold (common in winter starts).
  • Charging immediately after a hard climb (battery still warm).
  • Internal battery sensor issue (dealer).

Diagnosis checklist (still DIY-friendly)

A) “Did anything change recently?”

Wheel removal, transport rack, crash/bump, new accessory, new display, battery swap—then re-check the exact area you touched.

B) Look for intermittent triggers

  • Only on bumps?
  • Only on steep climbs / high assist?
  • Only when the battery is low?
  • Only right after charging?

Write down the pattern—if you end up at a dealer, this saves time.

When to stop DIY and go to a Bosch dealer

Stop DIY and seek dealer diagnostics if:
– The code returns repeatedly after restart + basic checks.
– Assist cuts out unpredictably in traffic.
– You see damaged wiring, bent pins, corrosion, or signs of water ingress.
– The official guidance says dealer (many Bosch codes do).

Related guides on this site

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

Sources (official-first)

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