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We just picked up a 2021 Civic and after driving about 20 miles all the error warning started popping up from bad braking system to low tire it just displays one after another.
Tried to do the battery disconnect and that did not work still happening.

 
Rep Power: 367

2021 still in warranty. Take back to dealer.
low voltage wreaks havoc in the electronics and light a Christmas tree in the dash

 
Rep Power: 512

After you disconnected the battery, did you make sure connections were good and drive around for a bit afterward?

 
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Yes after disconnecting we did drive still happening. I know it’s still under warranty and the dealer will address the issue but I wanted to know why this could happen. As mentioned low voltage is a possibility. It’s at the dealer now and at first check they said “never saw this before”. That does not give me a warm and fuzzy feeling. I will update this thread as soon as I get more info maybe it can help someone else 🙂

 
Rep Power: 512

I've had the random Christmas tree thing go on before in my 18 hatch. Disconnected the negative terminal for a minute, then tightened electrical connections (pretty much just the battery terminals) and everything went away. Sucks that Honda dealerships charge a $150 diag fee (at least that's the fee here in Vegas), but if quick fixes like that don't work, might warrant a trip. Figured I'd do the dummy checks, just in case. Can't assume anything without being there physically

 
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This issue has been resolved.... Turned out that a defective speed sensor was the cause of the issue.