WHAT happens if the CP4 fails, and HOW do I know if I should switch to CP3 now?

[GreaseMonkeyCaleb]

I just hit 100k miles on my 2015 RAM 2500. I’m hearing horror stories about the CP4 pump failing and sending metal shards through the entire fuel system ($10k+ repair). Is it better to spend the $2k now on a CP3 Conversion Kit, or just run a disaster prevention kit and hope for the best? Who has high mileage on their original CP4 without issues?

 

[DirtyHandsClub]

You're at the exact mileage where the CP4 gamble gets real. WHAT happens is simple: the lifter bucket rotates, it starts grinding the cam, and it turns into a 'glitter factory' sending metal into your rails and all 6 injectors.

HOW I justified the CP3 swap: For $2k, you get a pump that lasted a decade in the 5.9L and early 6.7L. A 'disaster prevention kit' only saves your injectors, it doesn't save you from being stranded on the side of the road with a dead truck. At 100k miles, your CP4 has done its job—don't push your luck.

 

[ColdStartKing]

I was in the same boat at 100k. what made me pull the trigger was thinking about how I use the truck. I tow a 15k lb fifth-wheel across state lines.
Being stranded in the middle of a trip with a $12k repair bill and a family in the truck is what I wanted to avoid. I did the CP3 conversion last month. The peace of mind alone is worth it. If you’re just a grocery getter, wait. If you work the truck, swap it.