Wireless CarPlay relies on both Bluetooth and Wi-Fi for different tasks. Bluetooth handles the initial pairing and subsequent reconnections between the iPhone and the vehicle. During first-time setup, Bluetooth pairs the devices, then the car provides the iPhone with credentials to join its dedicated Wi-Fi network. Once the Wi-Fi session is active, the car terminates the Bluetooth link to that phone. On future drives, the saved Bluetooth pairing allows the car to locate the iPhone and restart the wireless connection; Bluetooth can also help re-establish a session if Wi-Fi drops.

Once running, Wi-Fi carries the active CarPlay session, including audio, video for the dashboard interface, control data, and even phone call audio — which routes over Wi-Fi rather than standard Bluetooth audio. Apple recommends 5GHz Wi-Fi for its additional channels and lower congestion, though 2.4GHz implementations exist. The car creates this local Wi-Fi link directly; it does not require a home network, public hotspot, or separate internet connection.

Wired CarPlay transmits data via USB, avoiding wireless interference, though Apple does not claim it offers a fundamentally better experience. Wireless CarPlay adapters plug into a car's existing wired CarPlay USB port to act as a wireless bridge, but they cannot add CarPlay to vehicles that never supported it.