Error 14 on the Segway KickScooter P65 means “Throttle Hall sensor abnormality.” Most likely cause: a sticking throttle, a loose throttle cable or a faulty throttle. Try this first: check the throttle springs back.
The controller is getting a wrong signal from the throttle. A throttle that sticks can make the scooter move unexpectedly, so don't ride until it's fixed.
Step-by-step checklist
Work from the top. Steps go from free and easy to shop jobs. Switch the scooter off before touching any connector. Tick each step as you go. Your progress is saved on this device.
When it's time for a shop: if you've worked through every step and the problem is still there, contact the brand's support or an authorized service center. Bring your notes on when it happens, plus the code.