That code means theres Insufficient EGR Flow. Meaning you might have some gunk blocking the flow through your EGR valve or tube into your intake plenum. Try cleaning it out a bit with some carb cleaner.I own a 2007 dodge charger 3.5 v6
I just do the muffler delete thing i have got a good sound but the code p0401 start to show up every time i gas hard
Any one can help please tell me what is this code and what should i do exactly
Thank u .