i am running an afe intake and a mbrp duals with cat and the bd diesel intimidator programmer and was getting 0401 and 0404 and 0299 codes.called the dealership they checked into it and found new updates that would get rid of these codes and check engine lights. since the updates i have had no codes.:grd:

thats been out for a while actually, but isn't known by all I think, I had it done months ago myself.
15787618 New calibration with diagnostic enhancements for DTC P0401 and P0404

go here.. http://calid.gm.com/vci/VINEntryPre.do