What method is your car using to send text messages? Is it an app that's sending notifications or is is truly sending text messages?
If it's an app and notifications, this could probably be achieved using Tasker app ($4 on Google Play Store) on your Android phone.
Check out this thread for how to do it:
If it is actually text messages, you're going to need a phone with SIM card and a data plan to use Tasker in similar method.
