Yes you will need to take it to a dealer for codes unless you know somone with a portable scantool. It sounds like you have what is a common problem with the 2005 to 2007 6.0l,the fiting on the high pressure oil pump has failed,this allows the high pressure oil to leak and causes a hard start no start condition. There is a TSB for this,I will send it so you can take it to your dealer for repair.
This article supersedes TSBs 08-9-9 and 05-12-3 to update the Service Procedure and Service Labor Times.
Some 2005-2007 F-Super Duty, 2005-2008 E-Series and 2005 Excursion vehicles equipped with a 6.0L diesel engine may exhibit a hard start / long crank or no start condition due to low injection control pressure (ICP).
Follow the Service Procedure steps to correct the condition.
If oil is leaking from the ICP system or if air is trapped in the ICP system, the injection pressure regulator (IPR) valve may be commanded fully closed by the Powertrain control module (PCM) while the starter is engaged in an attempt to exceed 500 psi (3.5 MPa).
Figure 12 - Article 08-18-6
Eligible Under Provisions Of New Vehicle Limited Warranty CoverageIMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.
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