A Hiboy error code is the electric scooter telling you which system has a fault: E1 is the brake, E2 the throttle, E3 the link between the display and the controller, E4 over-current protection, E5 and E6 battery voltage, E7 and E8 the motor, and E9 a hardware fault. Below is what each code means, from Hiboy's own manual, and what Wilson's technicians check when a Hiboy comes in showing one. Fixing the fault behind an error code starts from $35, and a simple inspection is always free.
If your Hiboy shows E4, Hiboy's manual says both the electronic brake and the throttle stop working. If the throttle sticks on, the brakes feel weak, or the battery is swollen, wet or smells hot, stop riding and switch it off. Walk it to us or bring it in by car; don't ride it, and don't charge a swollen or wet battery.
Hiboy error codes at a glance
| Code | What Hiboy says it means | What we check first |
|---|---|---|
| E1 or F1 | Brake error | Brake levers and their cutoff switches |
| E2 or F2 | Throttle error | Throttle, its cable and connector |
| E3 | Communication problem between the display and the controller | Display, the cable through the stem, the controller |
| E4 | Over-current protection; the electronic brake and throttle stop working | Controller, motor wiring, connections |
| E5 | Low-voltage protection: battery below 30V | Battery health, charger, charging port |
| E6 | Over-voltage protection: battery above 46V | Charger, battery management board, battery |
| E7 | Motor hall error | Hall sensor cables, motor sensors |
| E8 | Motor phase error | Phase wires, motor, controller |
| E9 | Hardware error | Controller and its connections |
Code meanings and voltage figures from the troubleshooting table in Hiboy's S2 MAX user manual. Other Hiboy models can use different codes or voltage limits, so we read the code on your own electric scooter and check it against that model.
How much does it cost to fix a Hiboy error code?
| Job | From |
|---|---|
| Simple inspection (any brand, any issue) | Free |
| Full diagnosis, with disassembly or test equipment | $30, waived on repairs over $100 |
| Error code fix | $35 |
| Brake cutoff switch | $35 |
| Brake cable and lever replacement | $75 |
| Throttle repair | $50 |
| Wiring harness and connector repair | $35 |
| Controller replacement | $35 |
| Dashboard and display repair | $100 |
| Charger replacement | $35 |
| Battery load, capacity and discharge testing | $50, waived if the repair quote is over $100 |
| BMS diagnosis and replacement | $200 |
| Battery replacement | Quoted after the test |
| Hall sensor and phase wire repair | $100 |
| Motor repair | $100 |
Every price is a starting price that includes parts and labor; the final price depends on your Hiboy model and the part it needs. The same price list runs at every Wilson's shop. See the full list on our repair service page.
Hiboy E1 error: brake
E1 (shown as F1 on some displays) means the controller is getting a fault from the brake system. Hiboy electric scooters cut motor power when you pull a brake lever, using a small switch in the lever, and if that switch reads wrong the controller flags it. What we check: both brake levers, the cutoff switch in each, the cable from the lever to the controller, and the connectors along it, especially where the cable passes the folding hinge. A cutoff switch starts from $35; a new brake cable and lever from $75. While it's in, we also check the brakes themselves, because a code on the brake system is a reason to be sure the brakes stop you. See electric scooter brake repair.
Hiboy E2 error: throttle
E2 (or F2) is a throttle fault: the controller isn't getting a signal from the throttle that makes sense. What we find most often is a worn or water-damaged throttle sensor, a cable chafed at the folding hinge, or a corroded connector. We test the throttle signal across its full range, then the cable and connector, then the display it passes through. Throttle repair starts from $50. See electric scooter throttle repair.
Hiboy E3 error: display and controller
E3 means the display on the handlebar and the controller inside the deck have stopped talking to each other. The cable between them runs down the stem and through the folding hinge, where it bends every time you fold, so that's where we look first: broken strands, crushed insulation, a loose or corroded plug. Then we test the display board and the controller. A connector or wiring repair starts from $35; dashboard and display repair from $100.
Hiboy E4 error: over-current protection
E4 means the controller has seen more current than it should and shut down to protect itself, and per Hiboy's manual the electronic brake and throttle stop working while it shows. That makes it a stop-and-come-in code: switch the electric scooter off and bring it to us without riding it. What we check: the controller, the motor and its phase wires, and the connections between the battery, controller and motor, looking for a short, a burnt connector or water inside. If E4 keeps coming back, the controller is the usual suspect; controller replacement starts from $35.
Hiboy E5 error: low voltage
E5 is low-voltage protection. On the S2 MAX it shows when the battery drops below 30V, and the electric scooter cuts power to protect the battery. A battery that is simply flat can trigger it, but when E5 keeps appearing on a charged battery, or comes up as soon as you ride, what we usually find is a battery that has lost capacity, a failing cell group, a charger or charging port that isn't delivering a full charge, or a battery management board fault. We load-test the battery (from $50, waived if the repair quote is over $100), test the charger and the port, and tell you whether the battery can be repaired or needs replacing. Battery repair for range loss starts from $50, a BMS from $200, and a replacement battery is quoted after the test. See how long electric scooter batteries last and electric scooter won't turn on or won't charge.
Hiboy E6 error: over voltage
E6 is over-voltage protection; on the S2 MAX it shows when the battery reads above 46V. It can show briefly on a fully charged battery when the motor feeds energy back under braking or downhill. If it comes up often, what we check is the charger (a wrong or faulty charger is a common cause), the battery management board that should stop the battery overcharging, and the battery itself. Charger replacement starts from $35.
Hiboy E7 error: motor hall sensor
E7 is a motor hall error. Hall sensors inside the hub motor tell the controller where the motor is in its turn; when a sensor or its cable fails, the electric scooter stutters, jerks pulling away, or won't drive at all. What we check: the hall sensor cable and plug between the motor and the controller first, because the cable passes through the axle and can be pinched or damaged by water, then the sensors inside the motor. Hall sensor and phase wire repair starts from $100; motor repair from $100. See electric scooter motor repair.
Hiboy E8 error: motor phase
E8 is a motor phase error: a problem with the three thick phase wires that carry power to the motor, or with the motor windings. We check the phase wires and their connector for burns, breaks and water, test the motor windings, and test the controller's output to the motor. Phase wire repair starts from $100; if the motor itself has failed, motor repair from $100.
Hiboy E9 error: hardware
E9 is a general hardware error, most often pointing at the controller. We read the fault, test the controller and its connections to the battery, display and motor, and check for water inside the deck. Controller replacement starts from $35.
What if my Hiboy shows a code that isn't listed?
Hiboy's codes can differ by model and by display version, and some codes come and go with a loose connection. Bring it in and tell us what you saw and when: while riding, at switch-on, or while charging. We read the code on your model, look it over and tell you what we find. That simple inspection is free.
Which Hiboy electric scooters do we repair?
All of them, wherever you bought yours, including the S2, S2 Pro, S2 MAX, S2 Lite, S2 Nova, S2R Plus, MAX Pro, Titan and the rest of the line, plus Hiboy e-bikes. Every common job and its starting price is in our Hiboy electric scooter repair guide. We sell Hiboy too: see the Hiboy collection and which Hiboy electric scooter to buy. And we repair every other brand, from Segway and Ninebot to Gotrax: see Segway and Ninebot electric scooter repair and Gotrax electric scooter repair.
Where can I get my Hiboy repaired?
At any Wilson's shop. Express service runs at every shop, and delivery riders get priority at all of them.
- New York City: Flushing, Elmhurst, Brooklyn and Long Island City
- California: San Francisco
- Florida: Miami, walk-ins
Walk in, no appointment needed, or call (516) 300-0944. To plan ahead at the New York and San Francisco shops, book a repair online.
Frequently asked questions
What does E1 mean on a Hiboy electric scooter?
Per Hiboy's manual, E1 (or F1) is a brake error. We check the brake levers, their cutoff switches and the cable and connectors to the controller. A cutoff switch starts from $35.
What does E4 mean on a Hiboy?
E4 is over-current protection. Hiboy's manual says the electronic brake and throttle stop working while it shows, so stop riding and bring it in. We check the controller, the motor wiring and the connections; controller replacement starts from $35.
What does E5 mean on a Hiboy?
E5 is low-voltage protection: on the S2 MAX, the battery has dropped below 30V. If it keeps showing on a charged battery, we load-test the battery and test the charger and port. Battery testing is from $50, waived if the repair quote is over $100.
How much does it cost to fix a Hiboy error code?
Fixing the fault behind an error code starts from $35 at Wilson's, parts and labor included. The final price depends on which part has failed, from a $35 brake cutoff switch to motor repair from $100.
Is a Hiboy error code covered by the warranty?
A fault from a manufacturing defect can be covered: on a Hiboy bought from Wilson's, we manage the warranty claim for a year. Damage from water, a fall or misuse is excluded. See our warranty policy.
Do you repair Hiboy electric scooters bought somewhere else?
Yes. Any brand, any issue, wherever you bought it, at every Wilson's shop. A simple inspection is free.
Code meanings from Hiboy's S2 MAX user manual. Prices are Wilson's starting prices as of November 2026, parts and labor included. More prices: how much electric scooter repair costs. More repair guides: throttle repair, brake repair, motor repair and all repairs.
