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Troubleshooting

Hiboy S2, S2 Pro, KS4 and S2 Lite: motor hall error on the display (E7, or E2 on the S2 Lite)

Hiboy lists E7 as a motor hall error on the S2 family and KS4, and E2 as the hall sensor error on the S2 Lite. Check the hall plug and motor cable first; Hiboy's fix after that is a new motor wheel.

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Your Hiboy scooter powers on, but the display shows E7, or E2 if you ride an S2 Lite. Hiboy's own troubleshooting guide lists E7 as a motor hall error on the S2, S2 Pro, S2 MAX, S2R, S2R Plus, KS4, KS4 Pro and MAX Pro, and lists E2 as the hall sensor error on the S2 Lite (Hiboy troubleshooting guide). The short answer: a loose hall plug or a damaged motor cable is the cheap fix, and if neither is the problem Hiboy's answer is a new motor wheel.

This page touches motor wiring under the deck. Power off and unplug the charger before you look at anything, never touch the battery pack or its leads, and leave anything past a plug check to a shop.

Most likely cause

Hall sensors are small sensors inside the hub motor that report the motor's position to the controller. For E7, Hiboy says to remove the bottom plastic cover, check the motor plug and cable, fix a loose plug or a broken cable, and otherwise replace the motor (Hiboy troubleshooting guide). For the S2 Lite's E2, Hiboy says to tighten the motor hall connector under the bottom cover and replace the motor if the code stays.

Grin Technologies' hall sensor testing guide explains why the fix splits two ways: a hall signal that won't switch points either to the wiring for that sensor or to the sensor itself (Grin hall sensor testing guide). So, in order of likelihood and cost: a plug that has worked loose, a cable that is cut or crushed between the motor and the deck, or a failed sensor inside the motor.

Other causes to rule out

  • E8, phase loss: a separate code on the same models. Hiboy says to check and tighten the motor hall connector, then replace the motor if it stays (Hiboy troubleshooting guide).
  • E9, controller failure: Hiboy's fix is a new controller.
  • E4, over-current protection: brake and throttle stop until the scooter cools. Hiboy says it clears on its own and only points to the controller if it keeps coming back.

How to confirm

  1. Power off, power back on and read the code again. Photograph the display, as Hiboy suggests in its common problems guide, and check it against your exact model, because codes differ between Hiboy models.
  2. With the power off, spin the motor wheel slowly by hand. It should turn smoothly with no grinding. Note anything odd for the shop.
  3. Look along the motor cable where it leaves the axle and runs to the deck. Look for cuts, a pinched spot, or a cable pulled tight.
  4. If you're comfortable, and only with the power off and the charger unplugged, remove the bottom plastic cover as Hiboy's guide describes and check that the motor hall plug is fully pushed home. Reseat that plug only. Don't unplug or handle the battery connections.
  5. Refit the cover, power on and test at walking pace. If E7 (or E2 on the S2 Lite) comes back, stop there.

Fix options

Reseat the motor hall plug (easy to moderate)

This is Hiboy's first step and costs nothing. It fixes the problem when the plug has backed out from vibration. If it looks corroded or wet, see inspect and clean connectors. If the code returns within a ride or two, move on.

Swap in a new motor wheel (moderate)

This is the fix Hiboy gives once the plug and cable check out. Hiboy sells a front wheel with motor for the S2 Pro and KS4 Pro and a wheel with motor for the S2 and KS4, and its S2 series parts page lists a rear wheel with motor for the S2 MAX. Both motor wheel pages link Hiboy's own step by step install videos and say the part can't be returned, so confirm the fit first. Hiboy's setup and troubleshooting page asks you to contact support with your model and serial number when fit is unclear. If the scooter is still under warranty, contact Hiboy before buying anything.

Repair the motor cable or hall sensors (pro, needs soldering and electrical experience)

A shop can open the hub motor and replace the hall sensors, or splice a damaged hall wire. Grin lists a repair guide for a defective hall sensor inside a hub motor among its troubleshooting resources. This is only worth it when a motor wheel isn't available or a shop quotes less than a new wheel.

Parts

  • Motor wheel for your exact model (Hiboy part)

Videos

Hiboy S2 Pro Electric Scooter Motor Replacement from Central Scoot: a motor wheel swap on an S2 Pro.
HOW TO: Fix/Diagnose a Hiboy S2 Scooter that stopped working from Thrift Resell Repeat With The Nobles: an owner diagnosing a dead S2.

When to get a pro

Get help if the motor cable is cut or melted, if the code comes back after reseating the plug, if anything near the battery looks swollen or scorched, or if you'd rather not open the deck. See when to call a pro and the Hiboy scooter troubleshooting page.

Sources

Stuck after these checks? Find a shop near you.

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.

Talk

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