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Hiboy S2, S2 Pro, S2 Max, KS4 and S2 Lite: error codes

The codes Hiboy lists for the S2, S2R, S2 Pro, S2 Max, KS4, KS4 Pro, S2R Plus and Max Pro, plus the S2 Lite's different list, with what each means and the first check.

Last edited Nov 8, 2026 by Pedalwise team Edit History Add a subpage

The Pedalwise team started this page from official manuals, support pages and repair videos. Fixed this yourself, or spotted something wrong? Help improve it.

Battery and electrical safety. Lithium-ion batteries can catch fire if they're damaged or charged wrong. Never open a battery pack, and stop using any battery that's swollen, hot, wet or smells burnt. Every edit to this page is checked by a second person before it goes live.

This page covers Hiboy's main scooter list, which applies to the S2, S2R, S2 Pro, S2 Max, KS4, KS4 Pro, S2R Plus and Max Pro, and the separate list for the S2 Lite. The display shows the code as E and a number. The same number means different things on the S2 Lite, so check your model first (Hiboy troubleshooting guide). Hiboy suggests photographing the display so you have the exact code (Hiboy common problems).

A code that points at the motor, controller, wiring or battery is an electrical fault. Do only the plug checks on this page, with the scooter off, and leave opening the motor, controller or battery, soldering or rewiring to a pro or the maker's support. See battery won't charge and when to call a pro.

Codes

  • Error E1: electronic brake error. Hiboy's fix is a new electronic brake lever.
  • Error E2: throttle error. Hiboy's fix is a new throttle. What to check
  • Error E3: display and controller not communicating. What to check
  • Error E4: over current protection, the brake and throttle stop working. Let the scooter cool and it should clear. If it keeps coming back, the controller needs replacing.
  • Error E5: low voltage protection. Charge the scooter. What to check
  • Error E6: over voltage protection. Hiboy suggests easing off sudden braking and uphill riding, and a new battery if it stays.
  • Error E7: motor hall error. What to check
  • Error E8: phase loss. The motor hall plug is the first check, a shop job inside the deck.
  • Error E9: controller failure. The controller needs replacing.
  • Crossbar on the display: throttle or electronic brake failure.

S2 Lite only:

  • Error E1: display and controller not communicating. What to check
  • Error E2: hall sensor error. What to check
  • Error E3: electronic brake error.
  • Error E4: controller error.
  • Error E5: low voltage protection. Charge the scooter. What to check
  • Error E6: motor phase error. Hiboy's fix is a new controller.
  • Error E7: throttle error. What to check
  • Error E8: over current protection. Let it cool and it should clear.

Before you call a shop

  • Let go of both brake levers and check they return fully, since an active brake signal can block acceleration (Hiboy common problems).
  • Check that the throttle moves smoothly and springs back. If it sticks, don't ride.
  • Charge from a known working outlet with the correct charger, and check the port for dirt or moisture first.
  • Never charge a battery that is swollen, leaking, very hot or smells burnt.
  • Leave internal wiring and motor work to Hiboy support or a qualified shop.

Videos

Hiboy Scooter S2/S2pro Throttle Replacement/Repair from Shawn Day: swapping the throttle on an S2 or S2 Pro, the fix Hiboy gives for E2.

More help

Sources

Stuck after these checks? Find a shop near you.

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Need a pro?

If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.

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