I live near some historic areas, so last night I decided to take a ride up to Fairlane, Henry Ford old mansion. I come out code 21a maybe, bike would not power up, no glasses , pulled the battery, ok now. . What is the 21 code if anyone knows.
Here is Rad's guide to error 21:
https://radpowerbikes.zendesk.com/hc/en-us/articles/360015396794-Error-21-Troubleshooting-Guide