iPhone won’t play through Aux Jack in car anymore

It has been reported, and it very well is related the the iOS update. But what I'm saying is that when Apple does an iOS update, manufacturers of audio equipment get copies of the update to check to make sure their devices work with the update. Since it would be difficult for Apple to provide the different adjustments for their device to adapt to all radios, the radios can tweak their settings to work with Apple. Much easier.

There seem to be a number of complaints like that. No one has claimed any responsibility at this point, however the vehicle manufacturers are responsible to make sure that iOS works with their devices. I would ask them first.