Today, out of the blue, I had SES light and code P0404 thrown twice. It is EGR "Open condition" related, so I did some searching. I've found info about the EGR and related block off plate for 4.5 to LBZ LLY Duramax engines, but nothing on LB7 EGR. I can't even locate it to check the blue wire that has been mentioned in threads. If anyone is familar with the California spec LB7 EGR stuff to point me in the right direction or to a thread somewhere, I'd appeciate it.
thanks,
siggy