Bosch error 605: Battery temperature error
The battery is outside its permitted temperature range (roughly -10 to +40 C for riding, 0 to +40 C for charging). The system reduces or stops assistance or charging until the battery is back within range.
| Drive system | Bosch BES2 & BES3 |
| Severity | Warning |
| Keep riding? | Ride with caution |
| Typical cost | Free if it is just temperature; a battery with a faulty sensor is a replacement at 500-900 EUR/USD out of warranty. |
Likely causes
- Charging a battery straight after a freezing ride
- Bike left in direct sun or a hot car
- Riding in deep frost
- Battery heated by heavy continuous discharge on a hot day
- Faulty temperature sensor in the battery
How to fix Bosch error 605
- Stop and switch the system off
- Cold: bring the battery indoors and let it warm to room temperature for an hour before charging or riding
- Hot: move the bike into the shade and wait 20-30 minutes
- Restart
- If the code appears at normal temperatures, a dealer must check the battery sensor with DiagnosticTool
Warranty: Bosch batteries carry a 2-year warranty (or 500 full charge cycles, whichever comes first); deep discharge from long storage is often classed as user damage.
Typical cost: Free if it is just temperature; a battery with a faulty sensor is a replacement at 500-900 EUR/USD out of warranty.
Frequently asked
Can I reset Bosch error 605 myself?
Yes. Let the battery reach normal temperature and restart; the code clears itself.
Can I keep riding with error 605?
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 605 covered by warranty?
Bosch batteries carry a 2-year warranty (or 500 full charge cycles, whichever comes first); deep discharge from long storage is often classed as user damage.
Related Bosch codes
Manuals and video
- Bosch eBike Help Center: official error-code index
- Bosch eBike downloads: quick start guides and battery guide
- Bosch eBike dealer search (DiagnosticTool readout)
Not an official Bosch document. Compiled from workshop experience and public service information; details can differ per system version and bike brand.