No notification sound when CarPlay is connected

App & System Services Notifications
freddiefarruh OP
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We're building a taxi driver app. Our goal is simple:

Play a notification sound when a new ride request arrives — even if the iPhone is connected to CarPlay.

We use Firebase push with "sound": "default" and "interruption-level": "time-sensitive". The app requests .carPlay and uses a category with .allowInCarPlay.

Everything works when CarPlay is disconnected — we get sound and banner. But when connected to CarPlay:

the push is delivered silently, no sound is played (even on the phone), Siri Announce is enabled, but nothing is spoken. Questions:

Is notification sound blocked when CarPlay is active, unless the app has CarPlay entitlement?

Is Siri Announce the only way to notify the driver audibly in this case?

Would getting a CarPlay entitlement (e.g. CarPlay.communication) fix this without building a full CarPlay UI?

Thanks — all we need is a reliable sound alert when a new ride comes in.

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Engineer OP
Apple

You have asked this same question on multiple threads and was given an answer that only CarPlay apps - apps that have an icon on the CarPlay home screen - may show notifications.

I am not sure why you worry about building a full CarPlay app. CarPlay apps are not separate apps—you add CarPlay support to your existing app. CarPlay apps can use built-in templates to render their UI on the CarPlay screen.

You can find all the info you need in the CarPlay Developer Guide
freddiefarruh OP

thanks for the detailed answer