Same issue last week, model Y charged no problem, CT did not, red flashing light on home charger….CT also did not charge at Supercharger , had enough battery to make it to a service center…they replaced the Power Conversion System. Great service and they got me in on short notice.
Troubleshot...
Had same issue….the connection going into the screen had to be flipped over( not sure why)…the fix for me was to plug in the factory connection, once the screen was on, I used a black marker to mark the top of the wire plugging into the screen. I then added the extension wire and confirmed it...