Ken Downs it's not your egr valve that is bad or clogged. It's the egr ports in you intake that are clog and causing the egr boost senor(map sensor ) to throw
that code it should be a p0400 / p0401 / p0402 egr flow code. you have to take the throttle body off and the upper intake off and clean a port need the front of the intake on the upper intake. Highly recommend you save some money and take it to the Dealer (DO NOT TAKE TO AN INDEPENDANT SHOP) they don't know what to do. After that is down you should use better gas and do a top engine clean once in a while to avoid this pricy repair.