Hey rh8157,
Earlier you mentioned just updating to iOS 16.2. iOS 16.3 was recently released. Since updates include new features, security updates, and fixes, we recommend creating a recent backup and then updating to it. If you need assistance with backing up and/or updating, follow the steps below or in this article: Update your iPhone or iPad
1. Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see more than one software update option available, choose the one that you want to install.
5. Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now. If you don't know your passcode, learn what to do.
Also, make sure the volume is being increased on the car stereo and also the device.
Hope this helps. Take care.