Hi, I recently received a 2006 Sierra with a Quadzilla Stealth 2 programmer from a relative that passed away. On my ride home today, I experienced a slight issue, either a limped transmission or a problem with the fuel filter. The problem went away after a few time of turning my truck on and off. This is my first diesel and first experience with a programmed one, so I am pretty new to this. I was told that you could retrieve these error codes using the programmer. Anyone know how and would I still be able to retrieve the codes as the problem is no longer being experienced?