After spending hours trying to connect my new iPhone 15 Pro to my 2019 Mazda, I bought the Apple USB-C to lightning adapter. I had been able to connect my phone via Bluetooth for phone, messages, and audio function but it would not connect to Car Play like my older iPhone SE or my husband's iPhone 14, which both used the lightning connector. I plugged the adapter into my phone and used the regular USB-A to lightning phone cable and booted my phone and logged in with the passcode. As soon as I turned on my car, prompts came up to connect to Car Play. I choose always enable. Immediately the Car Play app displayed in the car screen. Easy. This is definitely a fix that needs to be addressed by Apple. Hope this helps others.