I got something similar a while back. No problems. I think sometimes there’s a glitch and the system generates a false alarm. A shutdown and restart and everything normal again. I have no evidence but my belief is these systems are just like your laptop, tablet, smart phone et all and sometimes have a glitch.
Wife took it to the dealer, apparently they hooked it up to two different diagnostic tools and found no failure codes of any kind. They instructed her to bring it directly to a Honda dealer without turning it off the next time it happens.
This is one of those things that bugs me about car manufacturers. Waterproof/water tight connections, connectors, boxes have been around a long time. This crap shouldn’t happen. Some things are just baffling, and shouldn’t happen.
I actually just received this warning. I tried turning off the car and back on again and it's still there. Pretty annoyed since there are only 750 miles on the car. Does this mean the AWD system is not working correctly?