If you can’t get your iPhone and your car’s CarPlay to make the connection automatically, there may be an important setting or two turned off. For one thing, while CarPlay is supposed to launch on its own when a device is detected, you might just have to manually start the CarPlay system by tapping on its app icon on your car’s display.
It’s also possible that CarPlay just has its connection permissions disabled. There’s a quick check you can make on your iPhone to ensure connection is allowed.
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Open your iPhone’s Settings.
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Tap Screen Time.
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Tap Content & Privacy Restrictions.
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If Content & Privacy Restrictions is enabled, tap on the Allowed Apps list.
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Find CarPlay on the list and switch it to Allowed.
If all else fails, go to the CarPlay settings under the General Settings menu in your iPhone to forget your car. Once your iPhone and car are unpaired, run them through the CarPlay setup process again to re-pair them. If you still can’t seem to make this connection happen, consult the official Apple Support website for more detailed instructions.