Bosch Smart System · Speed sensor · Error
Bosch Smart System error code 523004
The speed sensor is failing; speed is shown wrongly and power is reduced
What you can check
Switch the bike off and on again. If the fault comes back, have your dealer look at it.
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.