That's consistent with what I've been reading on these newer diesels. My understanding is the '11 - '16 Duramax used the CP4 pump which was upgraded to the CP4.2 after '16. I understand Dodge also used the CP4 but not sure what years. I just converted my Chevy from the CP4 to the older CP3 pump and also added a FASS lift pump for piece of mind. I'm also running a fuel additive to help lubricity with the ULSD fuel.
