ADblue OFDF still one error P2BAD - MHH AUTO

P2BAD: what does that error code mean? i have an engine light on my 2012 GMC drama w 160k miles and my programmer says it is P2BAD what

ADblue OFDF still one error P2BAD · psa_delphi__spc5674f_obd_fullbackup_vf7yb2mfb12l60347_20230406140525_int_ · PEUGEOT DELPHI

p2bad P2BAD – CHEVROLET · Code : P2BAD · Make : CHEVROLET · Description : P2BAD CHEVROLET NOx Exceedence

p2bad P2BAD Citroen NOx Exceedence – Root Cause Unknown P2BAD Citroen NOx Exceedence