Not strictly, no. Once you've selected some music, the car player doesn't know which playlist it originally came from. Thus, it can have no concept of next/previous playlist.

However, if you're running v2.0beta, you _can_ navigate to the last selected item in the menu. This will allow you to jump to the playlist you last selected, so you can get to the next/previous one relatively easily.

To do it:

1. Press down once to get to the menu. "Playlists" will be selected.
2. Hold the down button. It will jump to the last item you selected.