Hiboy scooter troubleshooting: won't turn on, charging, brakes and error codes

This page covers common problems on Hiboy electric scooters, including the S2, S2 Pro, S2 Lite, S2 Max, KS4 and Titan. Codes and settings differ between models, so match everything to your own manual.

Before you start

• Find your model name on the product label, your order confirmation or your purchase history, as Hiboy's setup and troubleshooting page suggests.
• Download your manual from the Hiboy user manual page, such as the S2 and S2 Pro manual.
• Unplug the charger before you start, as Hiboy's won't turn on guide says.
• If something seems unsafe, stop using the scooter and contact Hiboy support (setup and troubleshooting page).

Common problems and what to check

Won't turn on

From Hiboy's won't turn on guide:

1. Press and hold the power button for a few seconds and watch for any sign of life on the display.
2. Make sure the kickstand is up and the brake levers are fully released, since safety switches can block startup.
3. Look over the wiring, connectors, charging port and battery area for damage or swelling. Stop if you see swelling.
4. Charge with the original charger. On many models, E5 means low voltage and the fix is to charge (Hiboy troubleshooting guide).
5. In cold weather, bring the scooter indoors to warm up before trying again.

See won't turn on and inspect and clean connectors.

Won't charge

• Try a known good outlet, check that the charger light comes on and look for cable damage (won't turn on guide).
• Clean and dry the charging port, use the correct charger and never force the plug (14 common problems).
• The S2 and S2 Pro manual says to charge only between 41 and 113°F, and gives about 5 to 6 hours for the S2 and 6 to 7 hours for the S2 Pro. It suggests recharging when the battery drops below 20 percent.
• For storage, the manual says to keep the battery at 30 to 50 percent and top it up every 60 days.

See battery won't charge and check your charger.

Cuts out or loses power

• Stop safely and note any error code (14 common problems). On the S2 family, E4 is over-current protection. Hiboy says to let the scooter cool down and the code should clear by itself. If it happens often, the controller needs service (Hiboy troubleshooting guide).

Won't accelerate

• Check that the brake lever fully releases and the throttle moves freely (14 common problems).
• Never ride with a stuck throttle.

See throttle not working.

Brakes weak, squealing or rubbing

• With the power off, check pads, cable tension and rotor for wear or dirt. A rotor is hot right after a ride (14 common problems).
• On the S2 and S2 Pro, the left lever works the front disc brake and the right lever the rear. The manual explains adjusting in steps of about 1 mm, squeezing the lever 3 to 5 times, and leaving at least 5 to 6 mm of gap to the grip with the lever fully pulled.
• The manual suggests lubricating the brake cable every 2 to 3 months or 500 km.
• Do not ride with poor braking.

See adjust mechanical disc brakes and brakes.

Tires losing air

• Inflate to your model's pressure, look for punctures, and use soapy water on the valve to find slow leaks (14 common problems).
• Do not ride on a badly underinflated tire.

See set tire pressure and fixing a flat.

Stem wobble or rattles

• Before each ride, make sure the folding buckle and stem are locked (S2 and S2 Pro manual).
• If the handlebar and stem sway, the manual says to power off, unlock the fold and tighten the screws with M5 and M6 hex keys.
• Stop riding if anything wobbles at speed (14 common problems).

Rain and water

The S2 and S2 Pro are rated IPX4 and are not waterproof (S2 and S2 Pro manual). If your scooter gets wet, turn it off and dry it fully before charging (14 common problems). See e-bike got wet.

Error codes

From the Hiboy troubleshooting guide. Codes mean different things on different models, so do not apply one model's fix to another.

S2, S2 Pro, S2R, S2 Max, KS4, KS4 Pro and MAX Pro:

• E1: e-brake error.
• E2: throttle error.
• E3: display to controller communication fault.
• E4: over-current protection. Let it cool.
• E5: low voltage protection. Charge it.
• E6: over-voltage protection.
• E7: motor hall sensor error.
• E8: motor phase loss.
• E9: controller failure.

S2 Lite:

• E1: display to controller communication.
• E2: hall sensor error.
• E3: e-brake error.
• E5: low voltage. Charge it.
• E7: throttle error.
• E8: over-current.

For most codes Hiboy's fix is a replacement part, which is a job for a pro or Hiboy support. More on error codes.

Videos

Official help

Use the Hiboy troubleshooting guide for codes and the setup and troubleshooting page for warranty, parts and repair requests. Hiboy asks for your order number, model, serial number and photos or video with a repair request. For general upkeep, see e-scooter maintenance.

When to get a pro

• Codes pointing to the controller, motor, battery or wiring.
• Repeated cut outs, or any work inside the deck.

Sources

• Hiboy troubleshooting guide, Hiboy
• Setup and troubleshooting, Hiboy
• Hiboy user manuals, Hiboy
• S2 and S2 Pro user manual, Hiboy
• Electric scooter won't turn on troubleshooting guide, Hiboy
• 14 common electric scooter problems and easy fixes, Hiboy

Stuck after these checks? Find a shop near you.