Segway Ninebot E2 Pro: error 51, controller overvoltage after charging
Error 51 on the Segway E2 Pro is controller overvoltage, and Segway says the main cause is a charger not made for the scooter. Restart, switch to the correct Segway charger, and contact after-sales if it stays.
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Your Segway Ninebot E2 Pro shows 51 and beeps five long and one short, often right after charging. Segway's E2 Pro self-test manual says code 51 is overvoltage in the controller, and that the main cause is a charger that isn't specific to the vehicle. The short answer: stop using any charger that isn't the one made for the E2 Pro, restart the scooter, and contact Segway after-sales if 51 stays.
This page involves the charger, battery and controller. Never open the charger, battery or deck, and never use a charger whose output doesn't match your scooter. Leave controller and battery checks to Segway after-sales or a shop.
Most likely cause
A charger with the wrong output can push the system voltage higher than the controller accepts. Segway's self-test manual names a non vehicle specific charger as the main cause and says to turn the scooter off, let it sit for a while, restart, and contact official after-sales or an authorized service provider if the problem stays (Segway self-test manual). Segway's E2 Pro product manual lists the correct charger output as 41 V at 1.7 A, so you can compare that with the label on the charger you used.
Other causes to rule out
- A borrowed charger from another scooter or e-bike that happens to fit the port.
- A replacement charger bought online that isn't Segway's part for this model.
- A controller fault, if 51 shows with the correct charger. That needs after-sales.
- Other controller codes. Segway lists 53 and 54 as controller overcurrent from overload, which is a different problem. (Segway self-test manual)
How to confirm
- Count the beeps: five long and one short is 51.
- Unplug the charger. Read its label and compare the output with the 41 V, 1.7 A in Segway's product manual.
- Turn the scooter off and let it sit for a while, as Segway says, then restart.
- Charge only with the correct Segway charger. The product manual says its light shows red while charging and green when full.
- If 51 comes back with the correct charger, stop and contact Segway after-sales.
Fix options
Restart and use the correct charger (easy)
Segway's first fix. Retire any charger that doesn't match. See check your charger.
Replace the charger (easy)
Get the charger Segway lists for the E2 Pro, through Segway or an authorized dealer on its E2 Pro support page.
Controller or battery service (pro)
If 51 continues with the right charger, Segway after-sales should test the controller and battery. Don't keep riding or charging in the meantime.
Parts
- E-bike charger (Segway charger for the E2 Pro)
- E-bike controller (pro only)
Videos
When to get a pro
Get help right away if the charger or deck got hot, smells burnt, or 51 stays with the correct charger. See battery won't charge, Segway Ninebot scooter troubleshooting and when to call a pro.
Sources
- E2 Pro self-test manual, support.segway.com
- E2 Pro support page, 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.
If these steps didn't fix it, find a shop near you in our partner network. For battery or wiring trouble, look for shops marked Battery and electrical.
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