Bosch eBike Systems
Battery
603
Internal battery fault (subsystem)
Like 602, this code indicates an internal fault in the eBike battery, in a different subsystem of the battery electronics. Bosch's official measure is a restart; a persistent error means the battery has to be diagnosed by a dealer and may need to be replaced.
- Drive system
- Bosch eBike Systems
- Category
- Battery
- Motor behavior
- behavior unclear
- DIY-friendly?
- shop recommended
Roadside self-help
- Restart the system
- If the error persists, have the battery checked by a Bosch dealer
Possible causes
- Defective battery management electronics medium
- Fault in the battery cells medium
Symptoms
- Error 603 on the display
- Battery or assistance behaves erratically
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- dealer diagnostic tool required
- Component: battery
- Component: battery management system
Applies to
Gen2-Gen4 (BES2/BES3)
Displays: Intuvia/Purion/Kiox/Nyon