Some Bluetooth car kits do not support automatic reconnection. If the issue is not resolved, swipe down from the status bar on your phone to show the shortcuts menu, then touch and hold Bluetooth to access the Bluetooth settings screen. Unpair the car kit from your phone, then pair and connect them again.

Why wont my iPhone automatically connect to my car Bluetooth?

You should first make sure Bluetooth is turned on and try connecting your device in the Bluetooth settings. If your iPhone still wont connect to Bluetooth, you can try deleting other devices from Bluetooth settings, updating your iOS software, resetting your network settings, or restarting your iPhone entirely.