Try removing the “connection” from both your iPhone Settings and your vehicles display system, for the iPhone go to Settings/Bluetooth and tap on the “i”, then “Forget this Device”, once done reboot the iPhone. For your vehicle see the user manual, it will probably be under audio or music settings, then delete any reference to your iPhone and any other previous one if listed.
Then repair your Xs but try and follow your vehicle instructions if possible (and available), if you haven’t got that to hand go to the manufacturer web site and search for the help article. I’m probably stating the obvious but we all believe that we can do things like this without consulting a manual, but I’ve often been caught out by not reading through the instructions, the result a missed tick box or setting that prevented full operation.
Anyhow, hopefully the new pairing might sort the issue out, it’s certainly worth a try.