Ok luckily when I purchased my 13 Yukon it was certified and came with a warranty so this doesn't have to be paid out of pocket.
My issue is that a month or two after purchase the XM played only through the passenger side speakers. Regular terrestrial radio played through both speakers. I took the truck to the dealer and they replaced the factory XM unit. Here we are a few months later and I'm having the same exact issue. Going back to the dealer to see if they can further diagnose the issue but figured I'd ask here.
My issue is that a month or two after purchase the XM played only through the passenger side speakers. Regular terrestrial radio played through both speakers. I took the truck to the dealer and they replaced the factory XM unit. Here we are a few months later and I'm having the same exact issue. Going back to the dealer to see if they can further diagnose the issue but figured I'd ask here.