Blown main fuse on 2020 Honda CRV with 19,000 miles ?

Start with what main fuse blew and tracing down those circuits or components that was powered by it, fix or replace components, or repair circuits. I'm going to guess that the message will lead you to a problem with the EBC or a short in the EBC system. But that's just a guess.

The main fuse has a very high amperage. You have a dead short somewhere. In other words a bare hot wire touching something metal. Check the positive battery cable and move on to the wiring around the underhood fuse box, then the wiring down by the starter. If you've had either the battery or starter replaced recently the wiring could have been misrouted during the repairs. Also, if your battery is under the back seat or in some other remote location be sure the caps, if required, are there and not damaged. Jim

We used to drive cars till they rusted out , And even with an engine knock they still made it to the scrap yard , As long as people buy this crap they'll keep making them