2011 4.8 silverado weird stuff

I been doing some research and i think it is a common problem but mine had a different twist. This morning in pa it was 1 degree. I started my wifes car and started my truck but then i found out i didnt have to leave for a while so i shut my truck off. Bout 2 hours later i went back out and truck just cranked and cranked. Finally it started but idled around 1100 rpm, and threw out "engine power reduced" and wouldnt steer, and had no throttle. I shut it off and left it alone for 5 minutes and it started right up, check engine light was on but truck ran perfect! I did have less than 1/4 tank of fuel so i got gas and added some fuel line antifreeze. Check engine light said something about ignition switch but truck was running perfect after all that. Any thoughts?
Thanks yall