Hello Hauntedhagg,
Thanks for using Apple Support Communities.
It sounds like you are having issues with the sound quality using CarPlay with your iPhone. Check out this article with steps to follow to
Set up CarPlay with your iPhone - Apple Support
While the article talks about setting up CarPlay specifically, it also has steps you can check out to troubleshoot issues with CarPlay.
Get help
If CarPlay doesn't work like you expect, here’s what you can check. After each step, try using CarPlay again.
- Make sure that Siri is turned on.
- Restart your iPhone and your car. Depending on your car, you might see the CarPlay Home screen when you turn it on. If you don't, look for the CarPlay logo on your car’s display.
- If possible, connect your iPhone to a different USB port in your car.
- Try a different Lightning to USB cable. Make sure that the cable is certified.
- Update to the latest version of iOS.
- Check your car’s manual for help. You might need to install firmware updates for your stereo.
Let us know how it goes.
Best regards.