CP2A(carlinkit 4.0) can't wake up SIRI / Can't hear the other on the phone / play music with no sound
Unpair the phone from the car Bluetooth (Automotive Head Unit), and check if the CP2A(carlinkit 4.0) firmware is the latest version, update to the latest version.
How to Choose the Best Wireless CarPlay Adapter? This article will provide criteria for judgment, as well as our top 5 recommended wireless CarPlay adapters.