2014 2.0 XT yes
This is a common problem across many phones and head units on vehicles. See this thread, with an Android user having a similar problem.Just checkin to see if anybody has the same issue:
My beast is the '14 2.5i premium 6mt with stock head unit - when the iphone connects it streams music beautifully....just as it should. When I have google maps running, the voice commands come through the blue tooth over the music.....brilliant!!
The issue is that when the phone connects - it automatically starts playing music when on the BT setting....I have not found a way to stop the music and only hear the google maps voice commands. If I stop the music on the phone, the head unit reads "mute" and thus cannot hear the voice commands from Gmaps... Has anybody found a way to hear the voice commands from maps without music streaming over BT???
I believe there is a utility available on iOS to correct this, but it requires you to jailbreak your phone. That option wasn't available to me as mine is a work phone, so I did the next best thing. I added a 5 min silence track to the phone, and I play that in repeat mode whenever I want to use turn-by-turn directions without music. It's a hack, but it works.
While I have some songs on my phone, my main music source is an old iPod Touch that's plugged into the USB port. If you have one kicking around, it's worth plugging it in. iPod integration works better than BT-A. The UI gives you more control, and I believe the sound quality should be better over the hard-wired connection. You'll still need that silence track though for when BT-A is enabled.