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I'd suggest having a poke around the relevant topics. As long as you know that it is actually making a goal, have a look at all the topics between the goal and rviz, because it's getting lost somewhere (each topic will tell you which nodes are listening, and the nodes will tell you what they're sending).

For example: Is it sending the goal? Is it creating a path? Does cmd_vel get the message (and is it sensible)? Is rviz looking at the correct topic?

If you can find out where it goes wrong, you can have a more detailed look. Hopefully it's just something simple like rviz is looking at /cmd_vel instead of /my_autonomous_car/base_controller/cmd_vel or something.