One of the newest issues Google had to address with Android Auto is a core feature people would use the car platform for: being able to read and reply to messages. The bigger problem, though, was being able to reply to messages. When users tried to reply to a message from any app using Android Auto, the system would say that “I don’t know how to do that yet” or “I’m sorry, I can’t help you with that right now.” And it wasn’t a problem isolated to a device or car model or even Android/Google/Android Auto app versions. Thankfully, the issue has finally been resolved. Google advises to update the Google app but there was also a fix in a server-side update.
Source: Android Police