So last Saturday I updated my cts2, drove around for a little, and bam, check engine light, truck has 20,000 miles on it. The edge read it as p140b which is some issue with egr. I took it in to the dealer as it didnt go away. They said it needs a new egr bypass valve. Has anyone else had this problem? I do a lot of around town short trips, In the morning its nice and cold outside, I start it up, idle it for a minute or two, and baby it until it reaches operating temp. Four miles there in the morning, four miles back. And it sits all day. Wondering if this has something to do with it. Still waiting on the part. Very interesting though.