Duramax

So yesterday I was on my way home and noticed the VSC OFF light on my dash. When I got home, I realized my power door locks didn't work. Then realized that nothing electrical works without the key in the ignition. Every time I turn it off, it resets the clock, and climate. The map light doesn't work without the key in, or the power door lock. I also have to hold the power window button until the window goes all the way down. The auto window button, as well as the power mirrors doesn't work. Sun roof does work. It is all very odd since the truck drives fine, but this is very annoying and I assume it all ties back to one thing. Battery is about a month old and the truck starts right up, so the battery is fine. I've googled this issue and I'm not alone, but can't find an answer to what it might be. Any suggestions?

So yesterday I was on my way home and noticed the VSC OFF light on my dash. When I got home, I realized my power door locks didn't work. Then realized that nothing electrical works without the key in the ignition. Every time I turn it off, it resets the clock, and climate. The map light doesn't work without the key in, or the power door lock. I also have to hold the power window button until the window goes all the way down. The auto window button, as well as the power mirrors doesn't work. Sun roof does work. It is all very odd since the truck drives fine, but this is very annoying and I assume it all ties back to one thing. Battery is about a month old and the truck starts right up, so the battery is fine. I've googled this issue and I'm not alone, but can't find an answer to what it might be.