Bosch eBike Systems
Sensors
504
Speed signal manipulation detected
The system has detected an implausible or manipulated speed signal, which Bosch interprets as possible tuning. It can also be triggered by a wrongly positioned or non-original spoke magnet. While the error is active, drive assistance is deliberately reduced. Repeated tuning detections can require a dealer visit to fully unlock the system again.
- Drive system
- Bosch eBike Systems
- Category
- Sensors
- Motor behavior
- assist reduced
- DIY-friendly?
- possible
Roadside self-help
- Remove any tuning device
- Check the position of the spoke magnet and correct it
- Restart the system
Possible causes
- Tuning device manipulating the speed signal high
- Wrongly positioned spoke magnet medium
- Non-original magnet or sensor medium
Symptoms
- Error 504 on the display
- Assistance noticeably reduced
- Implausible speed values
Inspection / repair
- Difficulty: easy
- DIY: possible
- no dealer tool needed
- Component: speed sensor
- Component: spoke magnet
- Component: drive unit software
Applies to
Gen2-Gen4 (BES2/BES3)
Displays: Intuvia/Purion/Kiox/Nyon