Why is your phone overheating while using CarPlay or Android Auto?

In some situations, environmental conditions could well be the main factor. If your phone is exposed to bright sun for hours at a time, it's naturally going to soak up a lot of heat. It's probably a bad idea to use a windshield mount if you're driving through the Texas Hill Country in July. On the flipside, a vent mount could be problematic during a frigid Chicago winter if you turn the heater up full-blast.

More often, it's a combination of elements. For one thing, if your phone is sitting on a wireless charger, that automatically generates more waste heat than charging via USB. You don't need to be in your car to discover this. If you've got a Qi or MagSafe charger at home, try touching the back of your phone after it's been attached for a while — it's going to be noticeably warm. Even wired charging will raise temperatures somewhat if it's non-stop.

Meanwhile, your phone is usually being asked to handle several tasks at once. The most demanding is navigation, since an app like Apple or Google Maps will not only transfer data over 4G or 5G, but also render 3D terrain while trying to match it against your GPS location. You might also have music or podcasts going simultaneously, not to mention all the background tasks your phone normally performs. The only practical ways to push your phone harder are 4K video editing and console-quality 3D gaming.

The wireless versions of CarPlay and Android Auto invoke your phone's Bluetooth, Wi-Fi and cellular radios simultaneously. Bluetooth establishes the initial handshake. After that, cellular connects to the internet, and Wi-Fi links apps to your car's dash. This burns through a lot of juice, as you may have noticed if you've ever driven around town for an hour without charging. It's arguably reckless to attempt an intercity trip without plugging in.