I also having an issue with AVSpeechUtterance on CarPlay, specifically on Wireless Carplay. Im getting an error IPCAUClient.cpp:129 IPCAUClient: bundle display name is nil or IPCAUClient.cpp:139 IPCAUClient: can't connect to server (-66748) after speechSynthesizer.speak(speechUtterance) and my audio is not being played or all the audio, including from other app audio become very choppy.