P0404 code - serious?

p0404  P0404 code repair Code 404 is for a problem with the EGR valve circuit The valve may be open or closed when it should not be  I had the code read and it was P0404 and the recommendation is to clean the exhaust gas recirculation valve and all egr ports

Autohex online Help for members only, Vehicle:SANTAFE Model Year:2012 fault code:p0404  For most makes and models of vehicles, a trouble code P0404 is the result of an improper reading from your exhaust gas recirculation valve

It threw a p0404 code With this code, the car has no boost It starts up great, idles perfectly but I have no Default Re: Please help with gwm error codes P0404 and P2264 P0404