Opened a case with Apple to have this looked into. Confirmed that mine and my partners iPhone 7 Plus’ always worked for over a year using the adapter to our Buick. We both upgraded recently and it came with software 15.1. None of our phones connect to the car anymore since the update. Shaking my head for updating my older phone when it could’ve been used to bump tunes in the car 😭
Long story short, but was contacted and told it was a bug in the software and the engineers are trying to fix it. Here’s hoping they’re actually attacking this issue as driving to work with loud music is a pretty important part of my day as I’m sure is the issue with many others.
if you need the link to start up a case with them;
https://support.apple.com/contact
I don’t believe commenting on this thread adds to much of their knowledge/concern about how many people this is affecting.
Please contact them !