Bosch Smart System · Speed sensor · Error
Bosch Smart System error code 525002
The speed signal looks tampered with (tuning), so the motor goes into emergency mode
What you can check
Remove any tuning and check that the magnets are positioned correctly.
Dealer if the fault comes back
Trolda reads live data from Bosch Smart System bikes. What Trolda shows on your bike
Same part: Speed sensor
Sources
- Bosch eBike Help Center – én side per feilkode (2026-10-04)
Explained in Trolda's own words from the manufacturer's public documentation. Trolda is not affiliated with the manufacturer. If in doubt, ask your dealer.
Trolda for your e-bike
Trolda connects to your Bosch Smart System bike and shows what you did, what the motor did, and what it cost the battery.
Get TroldaTrolda is in open testing on iPhone and Android. You get the app through our tester page, it takes a minute.