There are many things that need to be improved in Android Auto, and after the latest updates, Google can add one to the list.
According to a discussion on the official Android Auto support forums, texting apps disappeared after a new software version was installed and right now there does not seem to be any solution.
While I previously came across isolated reports in this regard, Google replied in the linked thread that it is investigating the issue where the company then asks for more feedback to find out what is going on. Oddly enough, the thread has since been locked and no other users are allowed to post.
The topic launcher explains that after a recent update, it is no longer possible to receive text messages on Android Auto, whether they use Google or Samsung messaging apps.
“I have a Chevrolet Bolt in 2020. When I first bought the car, Android messaging worked fine. After a recent update of Android Auto or Android messages, I can not remember which one I no longer have the ability to send or receive texts from Android Auto. So I switched to Samsung messaging and still I get no option to send or receive messages from Android Auto,Explains to the user.
In many cases, apps that no longer appear on the Home screen are caused by a bad configuration that can be easily fixed by choosing which items you want to see on Android Auto. This option is available under the Android Auto settings screen.
However, the original poster claims that another with a Galaxy Note 9 was able to receive messages on Android Auto despite the icon of the messaging app still missing on the screen.
Needless to say, clearing the cache and removing data from Android Auto and messaging apps are solutions that make no difference. At this point, it is still not clear if Google is working on a solution or not, as the thread has already been locked.