Common eBike Display Error Codes and What They Actually Mean

DiagnosticsApril 23, 20266 min read

Decode the most common eBike error codes — Bafang, Rad Power, Aventon, and Super 73 — and what each one really means.

Error codes on your eBike display are diagnostic shortcuts. Most translate to one of a handful of fixable issues.

Bafang (common on many brands)

• **Error 21 / 22** — throttle or speed sensor fault. Check the connectors first.
• **Error 30** — communication error between controller and display. Usually a damaged cable.
• **Error 25 / 26** — brake or motor phase issue. Stop riding and inspect.

Rad Power Bikes

• **Error 21** — throttle stuck or shorted
• **Error 30** — controller-to-display communication lost
• **Error 06** — low voltage protection. Charge the battery.

Aventon

• **Error 04** — throttle not in zero position at startup. Don't touch it during boot.
• **Error 06** — low voltage. Time to charge.
• **Error 08** — motor sensor issue.

Super 73

• Most "E" codes trace to motor phase connector or display cable issues. Disconnect and inspect.

When to call a mechanic

If a code returns after a basic connector check, or you see anything pointing to motor or controller faults, get it diagnosed before riding hard. We carry diagnostic tools for every major brand and can usually fix the underlying issue in one visit.