2021 GMC 2.8 Duramax
Got a guy I’m trying to help out he had a clogged DPF he wants to delete it so I said okay. I got all codes cleared and it to perform a stationary regen truck passed. However I’m still getting a service emission system acrossed the dash but no CEL. There are permanent codes in the ecm. If anyone has some insight on where to go from here
u/Ridgid13 — 2 days ago