Q: Lightning to USB Cable iphone 6 in car no sound - do I need a different connection?

Hi Euphon1x,

I'm sorry to hear you are having these issues with your iPhone and your car stereo. If you continue to have audio issues with a USB connection, you may find the information and troubleshooting steps outlined in the following article helpful, up to and including contacting Apple Support directly if necessary:

Get help connecting your iPhone, iPad, or iPod touch with your car stereo - Apple Support

Cheers