Are you able to rotate the engine by using a socket and breaker bar on the crank bolt?

 

Well, I think I found the culprit. I crawled under it to check the voltages at the starter and the small ignition wire terminal had snapped and was disconnected. I missed it during my initial inspection due to it being tucked so far up in the motor. Gonna reterminate it and that should fix it. Thanks for the help.

One last question, since I had the p0684 glow plug code, should I just replace my GPCM?

 

I hope that does it. A fix that involves nothing more than a 15 cent connector and 5 minutes is awesome! I never get that lucky.

 

Clear the code first. If the code returns, then you have a problem to look into. Sometimes codes just pop up.

 

Well, that fixed it. re-terminated the small ignition wire and it fired right up. had to put my chip back in as well. ran fine after that too. I'm just glad it was a simple fix. Thank for all the help on here guys. I'm probably gonna need it even more here in about six months. I got an assignment to germany and will be taking the truck with me. So, I'm trying to prep and do alot of maintenance items before I go so there will be minimum problems while I'm gone.

On a side note, any of you guys know if my truck would be worth more in Europe than it is here in the states? I plan on getting a 6.7 when I get back and would like to take advantage of it if I can.