2015 Acadia radio will not get to the newer Sirius XM channels above 300. Highest is 234. Sirius XM says the radio is an XM radio, not a Sirius XM radio, and only the Sirius XM radios will get to the upper channels. Called twice, got same answer both times. They suggested that a "module" in the radio could perhaps be swapped out to make it into a Sirius XM radio. My GMC dealer as well as my local car audio shop have the deer-in-headlights look when I bring it up. Any other experiences?
