GM Class 2 high no communication 2004 Impala

2004 Chevy impala No communication, intermittent no start, here testing at the DLC once again shows the way to the problem. Gm Class 2 data link error diagnosis. Upcoming trainign on Snap On scopes 10/24/2019 http://handsonautotraining.com/snap-on-scope-class-10-24-2019/