I got p0411 last night when I was driving home which I see is a secondary air injection error or something like that. I'm inclined to believe the below freezing temperatures is messing with the air pump but I'm curious to see if anyone else has had this problem and what their diagnosis was.

 

Air pump?

 

Yeah you know...a pump with air....I didn't even know cars today had air pumps #gmprobs

 

I looked up the technical term for it...it's the air injection line. I replaced the hose and the problem is fixed.