So the problem is not just the display of 0W, but you think something's broken.
A methodical approach to troubleshooting will help members help you, starting with full details of your gear, sources, symptoms.
There are blinky-light testers available,
https://endless-sphere.com/forums/viewtopic.php?t=47258
also search for
Kit test Procedure
here https://em3ev.com/hub-motor-info/#ebike%20tester
I'm sure there are other guides, video resources etc for troubleshooting help for noobs, perhaps some of the more generous spirited members could suggest other links, rather than just sniping (flippy)?