2008 cts4, brake assist, abs, traction control, engine momentarily stalling, engine stalling requiring restart, engine reduced power, cam position sensor codes.
I disconnected battery starting with the positive lead and then the negative lead. I then located the engine control module on the passenger side of the engine compartment. I removed the large multi pin plugs from the top, inspected them and reinstalled. I then reconnected the battery starting with the negative lead. I performed the throttle body/pedal relearn procedure by turning the ignition to on without starting the car and left it that way for 10 minutes. After switching the ignition off then I started it up and drove it on a test loop. None of the problems appeared. It's still a bit early but this is a good no cost thing to try. I think that over the 11 years since it's manufacturer, the multi plugs were never disturbed and possibly developed a film or thin layer of material that tends to randomly insulate the pin from it's plug. Sometimes only momentarily but that is all it may take to cause a problem. The act of unplugging and replugging reestablishes proper contact. I hope I have solved my problem.