What Does This Error Mean?

Unusual motor noise on a Segway-Ninebot scooter is most often caused by debris inside the wheel hub or loose axle nuts. Check the wheel for embedded stones or grit, tighten the axle fasteners, and test again.

Affected Models

Ninebot KickScooter MAX G30
Ninebot KickScooter E2
Ninebot KickScooter F2
Segway Ninebot MAX G2
Ninebot KickScooter P65

Common Causes

Debris (grit, small stones) caught inside the hub motor or between the tire and fender
Loose axle nut or motor mounting bolt causing rattle under load
Worn motor bearings — common after extended use without lubrication
Phase wire partially damaged inside the scooter deck, causing uneven motor drive
Brake pad contacting the wheel rim when brakes are slightly misadjusted

How to Fix It

Inspect the wheel and hub for debris.

Lift the scooter and spin each wheel by hand. Listen for the noise and feel for resistance. Check between the tire and fender for trapped stones or grit, and brush out any debris with a stiff brush.
Tighten the axle nuts and motor bolts.

Using the appropriate wrench, check that the axle nut on the rear hub motor wheel is tight. A loose axle nut causes a metallic rattle that worsens under load. Also check any accessible motor mounting screws inside the rear fender area.
Check brake pad alignment.

On scooters with drum or disc brakes, a slightly misadjusted brake pad can rub lightly against the wheel, creating a scraping sound at low speed. Squeeze and release the brake lever while spinning the wheel to hear whether the noise stops when the brake is not engaged. Adjust the brake cable tension to add clearance.
Update firmware via the Segway-Ninebot app.

Open the Segway-Ninebot app and check for a firmware update. Some firmware versions introduce motor control improvements that reduce cogging or buzzing sounds at low speeds. Install any available update and test whether the noise changes.
Listen for bearing wear patterns.

Motor bearing wear produces a consistent grinding or humming sound that gets louder with speed. Spin the wheel slowly by hand with the scooter off — a rough or crunchy feel in the rotation indicates worn bearings. Bearing replacement requires motor disassembly and should be done by a qualified scooter technician.

When to Call a Professional

If the grinding persists after removing debris and tightening fasteners, or if the noise is accompanied by reduced power or vibration through the deck, the motor bearings may need replacement. Have it inspected at an authorized service centre.