What does Giant SyncDrive error code B4 mean?

A fault in the control unit, display or Smart Gateway on the handlebar Check the cables and plugs at the handlebar and start the bike again.

Giant SyncDrive · Control unit · RideControl GO and Ergo 3 (flashing lights)

Giant SyncDrive error code B4

A fault in the control unit, display or Smart Gateway on the handlebar

What you can check

Check the cables and plugs at the handlebar and start the bike again.

Dealer if the fault comes back

Trolda reads live data from Giant SyncDrive bikes. What Trolda shows on your bike

All Giant SyncDrive error codes

Sources

Giant E-bike Getting Started Manual V10.0 (2024-12)

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 Giant SyncDrive bike and shows what you did, what the motor did, and what it cost the battery.

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