P400 code egr?
Just hate to tear everything out of the way only to find it was something simple and very acessible
Thanks
BobH
For my situation the giant exhaust leak isn't helping or the cracked intake assembly (getting replaced tuesday) i'm hoping thats why its throwing the code. Just for kicks check your intake elbow for cracks. Also like you said might be something simple check to make sure everything is hooked up. The solenoid is alot easier to replace than the egr so. 

