It's synched up and I see my Pandora playlists, but when I play it, there's no sound. Any reason why that could be and what I can do to fix it?
Does it work if you merely launch the Pandora app and stream the audio over Bluetooth? You'll still get the album art, names, and music controls this way.
Assuming iphone: Check that the sound is directed to car. Double press the start button to see the applications dock. Scroll left to envelope like icon, press that and check the Car Multimedia is selected. My 2012 Prius 4, JBL audio, iPhone 4s requiresme to do that EVERYTIME.