1. Disabled Phone CarPlay
It's possible your BMW CarPlay problem is because it's not set up on your iPhone or accidentally disabled, even if it previously worked.
2. Disabled iPhone Siri
Your BMW's CarPlay will not work if your iPhone's Siri is disabled.
3. Incompatible iPhone And Car Stereo
Certain iPhone models, such as those prior to iPhone 5, do not support Apple CarPlay. However, iPhone 5 and newer models are compatible. If your BMW has an aftermarket stereo, it may be incompatible with CarPlay or require firmware updates. However, if you previously used the stereo without issue, it may not be the cause of your CarPlay issue.
4. Outdated iOS
Apple often issues updates, so ensure you have its latest version for CarPlay to work on your BMW
5. Connectivity Problems
Other BMWs have wireless CarPlay. To get your CarPlay working for this, you should connect it to your iPhone by pairing it with your CarPlay via Bluetooth or WiFi.
6. Defective USB Cable
A faulty USB cable may be the reason for your BMW's CarPlay issue, particularly if your car doesn't have wireless CarPlay. This is often caused by a connection problem with the phone's port, either due to USB restriction mode or a defective cable. USB restriction mode is a security feature that prevents USB devices from accessing your iOS device. To use CarPlay, USB restriction mode must be disabled.