The code aside, what is the truck doing that got you to take it to a mechanic in the first place?
On the codes, here is a site (part of the Dieselstop page)that has them all http://www.thedieselstop.com/faq/949.../00diesel.php3
but more to the point. Go ahead and clear the code and see if it comes back. I noticed that when my CPS went bad (Early '99 7.3) it was throwing all sorts of codes, but when I cleared them only the ones that pointed at the real problem kept reappearing. Some codes never reappeared and had I paid attention to them in the first place I would have found myself replacing lots of expensive parts that were actually perfectly fine. By the way, might as well get yourself a spare CPS (Cam Positon Sensor) now so you'll have it when your's drops dead on you - which it will do.