Now that I have traded in my Volt I am selling my Navtool. Was installed in my 2014 Chevy Volt, but will work for 2011 to 2015. Easy to install, it is all plug and play so no permanent modifications or wiring is needed. This allows you to add Apply CarPlay and Android Auto, as well as additional camera and video inputs and add a reverse camera if yours did not come with one. (I only used it for CarPlay, which was all that I thought the Gen 1 was really missing to be current).

Currently they are $600, my price is $400 shipped in the lower 48.

CHEVROLET VOLT 2011-2015 NAVIGATION VIDEO INTERFACE with BUILT-IN HD SMARTPHONE MIRRORING via HDMI (navtool.com)