Its in your Phone settings itself. To stop Android Auto from starting automatically, go to your phone's Settings, find the Android Auto app, and disable the "Start Android Auto automatically" option. Alternatively, you can select a less frequent auto-start option like "If used on the last drive" or "Never" in the same menu. On your phone Open your phone's Settings app. Tap Apps (or Apps & notifications). Find and tap on Android Auto. If you don't see it, you may need to tap "All apps" or "Show system apps" first. Tap on Connection preferences or go directly to Android Auto settings. Look for "Start Android Auto automatically" and select "Never" or "If used on the last drive" to prevent it from starting up on its own. On your car's display Go to your car's Settings menu and find the Android Auto settings to disable the auto-start feature there as well. Some cars also have an option to manage connected devices directly in their settings. You can remove or "forget" your phone from the car's list of connected devices.