Code P0401, EGR insufficient flow?

So the EGR pressure or inlet passages can get clogged up. Also, check the vacuum lines going to the EGR valve, if the valve does not open it will give this code, or if it opens but not enough exhaust gases are introduced into the engine this code will pop up as well. Here is a diagram which shows the vacuum lines and the passage you need to check. Check out the images (below). Please let us know what happens.