I have a 2010 Caravan SXT 3.8L. I am getting a p0401 code. I replaced the EGR valve a year ago(p0404) and everything was fine. Now a year later I am getting this new code. I have pulled the new valve off and cleaned it and also pulled the EGR tube and cleaned it. I am at a loss and do not know what do to from here. Please help or advise. Thank you.