This is a serious problem for anyone who relies on their iPhone for legal communication while driving (or waiting for a passenger to arrive at Boston Logan airport.) It could result in an auto accident or a death so let's address this as a critical problem PDQ!
I went through a lot of trouble from Tuesday evening to Friday mid-day.
Two vehicles: a '18 Ford Escape, a '17 GMC Canyon CrewCab.
Two iPhones. (both iPhone 11 Pros).
Before the upgrade, everything worked fine.
After the automatic upgrade to 15.2 my iPhone couldn't communicate (wired) with CarPlay. In either vehicle.
My wife's iPhone, post-upgrade, worked fine in both vehicles.
The software in the vehicles recognized the malfunctioning device. The head-end device did not need an upgrade
See the two pictures that follow. But CarPlay wouldn't work with my phone.
For days, I went through many, many steps various entities suggested.
In the end, I did a full backup of the phone to both my Mac and iCloud, erased the device, tested it with 15.2, and nothing else loaded. CarPlay was fine!!!!! So I erased it again and did a full restore. And it worked fine again.
What a royal pain!

