I registered just so I could provide some input. My 2013 Cadillac ATS (RWD, 6-speed manual, 2.0T) did the same thing to me yesterday - CEL, Stabilitrak & traction control lights, as well as the "Reduced Engine Power" message. After a few restarts and driving it for a while, the Stabilitrak and traction control lights went off, and the CEL disappeared shortly afterward. Since then I have not had the issue, but I scanned the car anyway and got code P16F3. I'm dropping the car off at the dealer in the next hour and will hear back from them after the weekend. I'll let you know what happens!