Wireless Carplay Disconnecting After update to 18.0.1

[jwzimm]

Hey all,

Since I updated from iOS 17 to 18.0.1 on my 15 Pro I have been seeing seemingly random CarPlay dropouts while driving in my Mini. It is like the wireless connection to the phone is lost momentarily causing the car screen to drop out into the normal menus. It will reestablish the connection and resuming playing my music fairly quickly only to do it again at some point. When looking at the WiFi menu on the phone I see my car as the current connection but with the "No Internet Connection" warning displayed. and the little spinning disc next to it. Is it possible that, while driving along, the phone is seeing a known WiFi and trying to jump to that thereby dropping the CarPlay connection? This is definitely new behavior and has never been an issue in previous iOS versions for me.

 

[jwzimm]

Hmm... digging around in my phone's WiFi settings I found three managed networks I could not delete. They are networks Verizon loads onto the phone that act as a way to offload data from the Cell network. The issue here is that the phone is seeing these networks and trying to join them. In so doing, it is kicking the phone off the car's wifi and disrupting CarPlay:

From another forum:

Go into your WIFI settings on your iphone.
Hit Edit.
You will see the list of all of your known networks.
Scroll all the way down to the bottom of that list.
If you have Verizon or ATT you will see a couple of "managed networks" at the bottom. Things like VerizonWiFi and PrivateMobileWiFi and VerizonWifiAccess
You will see that all of them are set by Verizon to "Auto Join". This is an issue.
Turn off Auto Join on all of these networks..
....Enjoy your uninterrupted CarPlay.
What is happening is your iPhone is picking up and utilizing these wifi networks to try to keep network bandwidth free, and even though it's not supposed to screw up the works, it causes a hiccup in connectivity. Anyways, this screws up the CarPlay stability.
Once I changed these settings, my wireless is bulletproof in the car.

 

[tbgb50]

I had similar issues with an iPhone 12. I deleted the car from the bluetooth device list on the phone. I deleted all the two phones from the car system. Rebooted the car and phone. Re-paired the phone with the car and it worked.