I have nothing but bad things about doing this on the Z forum.. I know it is set 15 stock but 16 or 17 is fine if I have enough but I do not think I want to risk that...

I think it is just a connector that is doing it because I have replaced the CTS but it is still throwing the code even though it is new so I am going to go to pull a part to find a GM connector for the CTS because they will fit.