Source: Apple
A bug seems to be affecting the iPhone 14 Pro line. Some of the early adopters are reporting issues with being heard at a suitable volume when phone calls are initiated via CarPlay in a vehicle. Some of the reports claim that after they call someone via CarPlay with either an iPhone 14 Pro or Pro Max, their voice sounded quiet or far away on the receiving end of the call.
The complaints seem to be coming from iPhone 14 Pro users running iOS 16.0.1, but someone has mentioned trouble with the standard iPhone 14. Downgrading to iOS 16 doesn't seem to solve the issue. MacRumors reported that this problem doesn't seem to show up through a regular hands-free Bluetooth call, but they have replicated the issue if coursed through wired CarPlay. Hopefully, this gets resolved soon.