Yes check for DTC's. There may or may not be codes present. Having done this for many years now I with relate a few findings;
1) I have never seen the issue fixed with "parts"
2) I have had people claim to have spent as much as $9k chasing this only to be fixed with tuning
3) The tuning fix does not eliminate the need for fuel system upgrades (lift pump etc)
More reading:
http://www.kennedydiesel.com/docs/Du...20detected.htm
Kennedy Diesel-owner
More than just a salesman-I use and test the products that I sell on a daily basis!
Superflow Lie Detector in house
2002 Chev K2500HD D/A CC Long LT 11.77@ 124mph at 7700# fuel only-e.t. needs help
2005 Chev K3500SRW D/A CC Long LT(SOLD)
2007 Chev K2500 Classic EC Short LT (Sold)
2012 GMC K3500SRW D/A CC Long LTZ Happy Birthday to me! Built 1 working day after my birthday and delivered 7 days later.
2016 GMC K3500SRW D/A CC short LTZ
Custom tuning in house using EFI Live tuning software!