Iphone won't play music through car stereo anymore?

When I used to plug my iphone into the USB port in my car stereo, i could play my music through it. All of the sudden, it stopped working. The song title will scroll on the screen like its playing but no sound will come out. I made sure that the volume was all the way on and its not the cord because when i play Pandora, it works, just not my music. It won't even work if i try using the old headphone jack cord that i used to use.

Head unit could possibly have a short, then again could be your iPhone. Try hooking up another iPod or a different source of music to see if it's your phone.

My iPhone 6 is doing the same thing is there any fixes for it

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