A few DTC's

[06_6.6]

So I've got:

-P0403 EGR Control Circuit
-P0672,3,4,5,6,7,8 Glow Plug Circuits

Any guidance on how to fix these? Thanks

Truck is a 06 LLY, Supposedly has a tune (canned more than likely, was a previous company truck)

 

[06_6.6]

Thought I should add that the truck starts and runs fine, and over the weekend I hand calc'd 17 MPG mostly city

 

[JoshH]

The EGR code is probably a bad EGR motor or a circuit problem. The glow plug codes are most likely bad glow plugs. They're easy to change and relatively inexpensive.