"18.4.1 dropping carplay over wireless: Ever since I installed 18.4.1 on my 16pro, carplay has started dropping over wireless. Is anyone else having this problem. I know this update was supposed to fix this 'rare' problem but the problem didn’t start until I upgraded."
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Troubleshooting CarPlay After iOS18.4.1 Update:
There is no mention of CarPlay being a issue that was fixed with this update. See here: About the Security Content of iOS 18.4.1 and iPadOS 18.4.1 - Apple
A. Add the iPhone Back:
Forget this Device (your iPhone) from your car stereo, and then add it back.
B. Driver's Manual:
Read your driver's manual to find out more about syncing this.
C. Try being in Park:
For many, they must have their automobile in park to get this to all pair.
D. Visit this Link:
If you need help with CarPlay - Apple Support