Segway Ninebot E2 Pro: error 15 at startup, brake lever sensor fault

Your Segway Ninebot E2 Pro shows 15 at startup, beeps one long and five short, and won't accelerate. Segway's E2 Pro self-test manual says code 15 is an abnormal Hall signal from the brake lever, and that if the lever doesn't spring fully back during startup the dashboard shows 15. The short answer: let the lever return fully, restart, and if it keeps sticking, have the lever or its cable seen to.

Most likely cause

A small Hall sensor in the brake lever tells the controller when you squeeze the brake. If the lever is slightly held in at power on, the controller sees a brake signal it doesn't expect and flags it. Segway's first step is to check that the lever rebounds into place, let it return, then restart and confirm (Segway self-test manual). Segway's E2 Pro product manual lists the brake Hall sensor error and says to check the brake handle, dashboard and cables.

Other causes to rule out

• A lever bent or stiff after a fall, so it doesn't return on its own.
• A brake cable or housing that is too tight or dragging, holding the lever in.
• Your hand resting on the lever as you power on.
• A damaged cable from the lever to the dashboard, per the product manual's advice to check the cables.
• Error 14 instead of 15. That is the throttle. See E2 Pro error 14.

How to confirm

1. Count the beeps: one long and five short is 15.
2. Power off. Squeeze and release the brake lever several times and watch it snap fully back without help.
3. Power on with both hands off the levers.
4. If 15 clears, note whether it returns when the lever is cold, wet or after a bump.
5. Look along the brake lever cable for cuts or pinched spots at the stem fold.
6. Check the code meaning in the Segway app, which the product manual says shows error details.

Fix options

Free the lever and restart (easy)

Segway's first fix. If the lever sticks, clean around the pivot and check the brake cable isn't pulling it in. See check brake cutoff and throttle.

Adjust the brake cable (moderate)

A cable adjusted too tight can hold the lever in. Have a shop set it if you aren't sure, because the brakes must still work fully. See e-bike brakes for the basics.

Replace the brake lever, dashboard or cable (pro)

If the lever returns cleanly and 15 stays, the sensor, the dashboard or the wiring needs testing by Segway after-sales or a shop.

Parts

• Brake cutoff sensor (in the brake lever)
• Brake cable
• E-bike display (dashboard, pro only)

Videos

When to get a pro

Get help if the lever is damaged, the brakes feel weak, or 15 keeps coming back. Don't ride a scooter whose brakes you aren't sure of. See Segway Ninebot scooter troubleshooting and when to call a pro.

Sources

• E2 Pro self-test manual, support.segway.com
• support.segway.com
• E2 Pro product manual, store.segway.com
• How to Check Error Codes Meanings on Segway Ninebot eKickscooter E2 Pro, youtube.com

Stuck after these checks? Find a shop near you.