Hey fokes! Through work I have aquired All-Data at home for personal use. If anyone has any questions on a DTC Code or just need help feel free to send me a PM with your problem. I just figured I'd make a posting to help some people out. You can also talk to me on AIM or MSN or even e-mail me.

 

lets see waht it says for p401...

 

wont find much for p401, but p0401 would be there.

it says to use this troubleshooting guide from bob to diagnose your problem.
http://www.tomco-inc.com/Tech_Tips/ttt36.pdf

 

My advice would be unplug the small line going into the top of the EGR and see if the truck runs worse or tries to stall. If it doesnt then you have a clogged EGR. If it does try to stall the engine when you unplug the vac line then the problem is else where.

 

hmm i put my new EGR in about 500 miles ago so either theres a leak somewhere or its my DPFE again...

 

could be carbin build up that you have over looked?

 

Check your vacum lines.. This is comon to come off... If you have a vacum guage you may also want to check the the exact pressure.