Afterblow, NBS, NNBS, DIC, etc. Manufacturer specific anachronyms that all the long term owners are used to. We forget these vehicles are lasting 2-3x as longer than GM expected and some of these $86k vehicles are being sold for $14.5k (that’d be my Esky lol), and still reliable with another 200k left in them.
That’s a solid referral on the BTdieselwork OBD programer. 295 for the unit and 395 for the version with the engine & trans tune, which I regret not getting.
The best way to get up to speed on the Tech2 is you tube videos. All of GM’s secret unlock features are found in the BTdieselwork module.