@Hike208 - I was the one that originally suggested that pulling the NOx2 connector might clear the countdown. My NOx2 went hard fail while on the road and the countdown reset. I did not actually try pulling the sensor.I'm also on the skeptical side. But if buying the regular stuff means that I get to save a few bucks while not taking a chance, that's what I'm generally going to go with.
Anybody know for sure if pulling the connector for the NOx 2 sensor will disengage limp mode? I understand I'll probably get a CEL for a U029E code or similar denoting a sensor comms issue. Obviously the best way to figure it out would be to simply unplug the sensor, drive it and see, but I'm still afraid of eating into my limp mileage allotment if I need to drive it 150 miles away for repair :/
I have learned since that NOx2 houses the end of line termination for that particular comm line stub. I don't remember what is on that line besides both NOx sensors but standing waves will be bouncing around on that line without NOx2 and that could trigger additional communication errors.
I also have no idea whether GM coded hooks to detect the pulled connector.
If you do decide to try this - certainly let us know the result.