2 letters, 1 number.What's wrong with the 2015 LML?
At the end of the day you have to weigh the good with the "bad". Yes the CP4 injection pump is an issue but there's a solution to that issue. If you're that worried about the CP4 you can swap it out and do a CP3 conversion.2 letters, 1 number.
Add the more problematic DPF and DEF systems... and.. oh hell here ya go.
What are the most common LML Duramax problems? What can be done to fix these LML Duramax problems? Find out in this article!dieselresource.com
"Become part of the roadside scenery" - Love it!!The L5P is a better platform, so if that's an option you should take it. However, the constant bashing of the LML's over the possibility of the CP4 going out is getting old. As someone rightly pointed out a couple times in this thread already, there are WAY more functioning CP4 trucks than ones that have grenaded themselves. We live in a bubble on our forums. People sign up when they have a problem. They come here looking for advice on the most extreme and unique situations. No one is stopping in here saying "Hey guys, my LML is stock and works as intended."
Is there a possibility your CP4 will grenade and send you looking for a crate motor? Yeah, there is. Your truck could also experience a runaway at any time, too. You could throw a rod bearing. You could have a wiring short melt down and light the engine bay on fire. You could hit a deer. A deer could hit you. You could hit an icy patch on the road and become part of the roadside scenery. A widowmaker could fall on your truck while it's parked in the driveway. Someone could steal your truck. Jesus Christ could come back this afternoon and your truck problems won't matter anymore.
All L5Ps (2017+) have an in-tank lift pump and a Denso HP4 injection pump.My View (it is just a view, and does not imply that others are incorrect)
A 2015 should be going for closer to ~ $40k, you can get a 2016 for very low $50's and a 2017 for mid $50's. Because the 2017 is an Engine Change to the L5P it is driving down the price of the previous generation. I would also say that for some reason, I feel like the 2017 model made a change to the interior, and the seats are much LESS comfortable than the 2017 - but nothing compares to the barco lounges GM was using like in my 2006!!
Most of the "issues" listed in the article have to do with the IFS, and these are wear parts on all years of Duramax, so its going to be an issue regardless of which year you buy. In my view worth the cost of eventual Steering parts replacement since the ride is waaaaay better than the solid axel of Ford or Dodge.
The CP3 does appear to be a better built pump, however it has the same issue of possible failure. I suspect, if you are keeping it stock, not oversizing injectors, not installing a hot tune, not installing a bigger turbo, and putting Fuel Additive in the Tank, you will not see an issue. I don't love that GM dug in their heels so much on not putting in lift pumps until they finally gave in for the 2020 model year, but if a person wanted to feel more confident, they could install a Kennedy lift pump [I just prefer the Centrifugal Pump over the Fass/Air Dog PD Pumps, especially on a stock truck]. I would suspect [have absolutely no actual data to support this] that 95% of typical LML drivers do not have a CP4 pump issue, and ~ 60% of modifed LML owners see issues with the CP4.