Error 51 on Segway-Ninebot E2 Pro

In plain English

The scooter protected itself because the voltage was higher than it should be. The most common cause is a charger that isn't the original one, or a faulty charger.

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.

1. 1Unplug the charger and only use the originalFree If this code showed while charging, unplug the charger. Only ever use the charger that came with the scooter: a wrong or faulty charger can damage the battery and is a fire risk.
2. 2Check the outside of the deck (don't open it)Free Look at the outside only. If the deck is swollen or cracked, the charge port is wet or burnt, or it's very hot or smells, don't ride or charge it and contact support. If it smokes, get everyone out and call 911.
3. 3Contact support or a service centerShop job If the code stays after these checks, stop riding and contact the brand's customer support or an authorized service center. Don't open the deck, battery, controller or motor: most scooter batteries and controllers aren't user-serviceable.