Bosch Smart System · Control unit · Warning
Bosch Smart System error code 113121
No connection to your phone, or the connection was lost
What you can check
Check that Bluetooth is on and eBike Flow is open, then reconnect the bike.
You can usually fix this yourself
Trolda reads live data from Bosch Smart System bikes. What Trolda shows on your bike
Same part: Control unit
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.