This would be my guess even over power. I worked on a Production in Mexico City for many months and my computers were fine when there were no brown or blackouts. By the end I was on a dedicated genny all day but only because blackouts cost us a day of work. not a problem with an charging EV.
Reading the Tesla paperwork it seems like dinner across the boarder would be OK. Unless you broke down. Then you would be on your own getting the car back. Do we think they would they track your location and even care if nothing went wrong?
What the Tesla warranty actually says though is that if the car is driven or even transported in Mexico the warranty is void. If you even have the car trailered through Mexico it voids the warranty.
Who knows if they would track it, but they certainly could with the GPS and/or network.
I'm really just wondering why they care at all.
If it's because of the power, I'd think they could refuse to fix the charger, but why would that void the warranty on the entire car?
The differences in lighting, etc. aren't a problem with any other car, so shouldn't be with Tesla either, and why would that be a warranty issue anyway? You might get a ticket, but that's not anything to do with Tesla.
Even if the car got shot up, that's not a warranty issue no matter where you are.