P0404 code - serious?

p0404  P0404 fault code This code refers to the EGR valve and its performance On the code reader it refers to 'A'control circuit Does anybody know Default Re: Please help with gwm error codes P0404 and P2264 P0404

Code P0404 usually indicates that there is a carbon build-up somewhere in the lines, or on other occasions, a bad EGR valve  The glow plug light flashes all the time after around 3 mins after you start the van I took it to a garage and they read the fault code which was P0404 EGR

What is the P0404 Error Code? The P0404 error code is a specific diagnostic trouble code that signifies a problem with the EGR system's I'm getting an intermittent check engine light with a P0404 EGR performance code, but the vehicle is running fine