S866 code list · S866 Display

E05 Error on S866 Display

What it means + how to fix it Commonly reported

Quick answer

E05 on the S866 means “Cruise mode.” This is a normal mode, not a fault. To clear it: turn cruise mode off.

Try this first

Free, and each takes under 5 minutes.

Turn cruise mode off
Turn it off and on again

In plain English

Cruise mode holds your current speed, and the code shows while it's on. It isn't a fault. Braking or pressing a button normally turns it off. Your manual shows which button your display uses.

Step-by-step checklist

Work from the top. Steps go from free and easy to shop jobs. Switch the bike off before touching any connector. Tick each step as you go. Your progress is saved on this device.

1Turn cruise mode offFree Squeeze a brake lever or press the cruise or down (-) button. The code should go away.
2Turn it off and on againFree Switch the display off, wait 30 seconds, then switch it back on. If the code clears, note what you were doing when it appeared, in case it comes back.
3Check for a stuck buttonEasy Press each button on the handlebar pad a few times. A button stuck down by dirt or water can send commands non-stop. Clean around it and check the pad's cable and plug.

Parts you might need

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Only buy a part if the free steps didn't fix it. Always match the voltage and connector type to your bike.

Display button pad (remote)
Replaces a sticky or broken handlebar button pad. Must match your display.
Link coming soon

Still not fixed?

Pages to try next:

When it's time for a shop: if you've worked through every step and the problem is still there, take the bike to an e-bike shop. Bring your notes on when it happens, plus the code.