And I'm saying zero cars support CarPlay Ultra because that's not how cars work. The dash screens cannot be made into just additional infotainment screens because the infotainment is explicitly architected as an external device to the car.

What I've been saying is that the infotainment is external to the car, not significantly more connected and integrated than the spare tire, and that everyone needs to understand that.

Here's an explanation of CarPlay Ultra, which really is the phone driving your dash and instrumentation: https://www.apple.com/newsroom/2025/05/carplay-ultra-the-nex...

There's only a couple of Aston Martin cars that support it, but there's supposed to be more coming. See: https://www.stuff.tv/features/apple-carplay-ultra-compatibil...

You are mistaken, sorry. Even the normal everyday infotainment on most modern cars has receive-only telemetry available to it from the car control computers. Some elements are passed through (like EV state of charge) to old style CarPlay as well. Think data diode (making no claims as to the actual physical implementation, but logically it works)

CarPlay Ultra is just an extension of that where the gauge cluster is now just another infotainment screen that displays the received telemetry data. It does not have access to the ECU, cannot interfere, can be rebooted with impunity, etc.

Wouldn’t that mean CarPlay Ultra is flat out impossible?

But it exists. And is available in at least one production car.