Ninebot Max Error Code 40

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Error 40 on a Ninebot Max.
"Control Board Temperature Sensor is abnormal. Please check the Control Board."

Or in the new app:

"Controller temperature sensor error"

If your Ninebot Max is beeping or has a red wrench icon and flashes this code, read below.

If you clicked the wrong error code, go back to the Error Code Index.

Previous Error Code: Ninebot Max Error Code 39 - Next Error Code: Ninebot Max Error Code 41


This can be caused by an issue with the temperature sensor on the ESC/Controller.

That can be due to overheating/under temperature or a wiring fault.


Make sure the temperature reported is not outside of the rated values.

Confirm that all wiring harnesses are securely in place.

If all else fails replace the controller.