What does Giant SyncDrive error code 66 mean?

The motor has an invalid setting stored You can’t fix this yourself. Your dealer reads the fault with Giant’s tool and takes a look.

Giant SyncDrive · Software · Service codes (Giant Service Tool, 2020 models)

Giant SyncDrive error code 66

The motor has an invalid setting stored

What you can check

You can’t fix this yourself. Your dealer reads the fault with Giant’s tool and takes a look.

A job for your dealer

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

Same part: Software

All Giant SyncDrive error codes

Sources

Giant MY20 G-System Service Manual (error code table, pp. 84–85) (2020)

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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Trolda is in open testing on iPhone and Android. You get the app through our tester page, it takes a minute.