I can help you with that. Here are some troubleshooting steps you can try:
- Force close Google Maps on your iPhone. To do this, double-click the Home button and swipe up on the Google Maps app.
- Restart your iPhone. To do this, hold down the power button and the home button until you see the Apple logo.
- Forget your car in CarPlay settings. Go to Settings > General > CarPlay, tap your car, then tap Forget This Car. Then set up CarPlay again.
- Update Google Maps and iOS. Make sure that you have the latest versions of Google Maps and iOS installed on your iPhone.
- Check your car's firmware. Make sure that your car's firmware is up to date. You can check this in your car's owner's manual.
If you've tried all of these steps and Google Maps is still not displaying on your CarPlay screen, you can contact Google Maps support for help.
Here are the links to the support pages:
I hope this helps! Let me know if you have any other questions.