Diesel truck won’t start 2007 2500HD silverado

I'm sorry to say that you'll have to have a professional near you perform needed testing. The good news is that it appears then concern is active, so a good, well skilled and trained Diesel technician familiar with this engine should be able to learn much by hands on inspection. Use this link to find some shops near you that can help with your concern: www.repairpal.com/repair-shops