Boost Your LML Duramax Performance: The Hidden Benefits of CP3 Swapping

[@jada121606]

I have a 2012 LML Duramax with 322,000 miles. I did the CP3 conversion at about 175,000. Installed a FASS 165 lift pump. I deleted it and has a CAI, programmer(towing tune) and 5 inch turbo back exhaust. I also changed over to Catepillar oil filter, fuel filter and water separator. This thing runs like a champ, no issues. It's my daily driver.

[@Skyhawk172m1]

Have a 2016 Duramax with 41,000 miles. Use it mostly to pull our 5th wheel. I procrastinated for several years about the CP3 conversion. I did put an Airdog lift pump on approx. 1 1/2 years ago and always run additive. I have followed all the bad reports about the CP4 and quite frankly it really concerned me. When my extended warranty expired I decided to bite the bullet and do the conversion. Being a retired aircraft mechanic I felt that even though I had never done this conversion before that I would give it a go. In July of 2023 I completed the job using and S&S CP3 kit. This was their latest version with a new block for the 9th injector and a port for the temp. sensor. Per kit instructions I did a regen on the DPF system and so far I have put around 1000 miles and pulled our 5th wheel with no issues. I did this for peace of mind as I dreaded the thought of a complete failure on the road especially pulling the trailer.

[@zackz3148]

Doing a CP3 conversion at 180,000 right now. Haven’t had any issues with the Cp4 but I’m not gonna wait around for them.

[@stevenharvey1375]

2013 Stock with 465,876 with CP4 still going strong. Change your filters and use a fuel additive. Have done this day one and no issues. Will go to CP3 when the motor goes for a rebuild shortly.

[@nathanscheele9197]

Just had a BD cp3 conversion installed on my 2016. The truck had 85,000 miles. The cp4 didn’t fail, just wanted to make sure the truck stays reliable.

[@atxM3]

Great video. I have 2019 Ram. Bone stock. CP4 blew up at 7000 miles before recall. And again at 46k miles when CP3 conversion was covered by the recall. From what I can see in the paper work it was a $19k repair. Crossing my fingers it doesn’t happen again or at least not before I can sell the POS.

[@KB_228]

I needed a new water pump. I have had my cp3 conversion sitting in my office for other 3 years. Since I needed to replace my water pump I decided to go ahead and do my conversion..... 330k miles, original stock cp4 pump, original stock injectors, installed my lift pump about 100k ago. Had zero metal shavings but did have pieces of rubber and plastic on the screen. Blows my mind it was still running without an obvious issue.

[@rite2beararms]

I'm at about 230k with mine and no issues (yet). While I know it does get blown out of proportion, it's just that thing that lingers in the back of your mind... when is it gonna fail? Did you use lubricity additive and/or live in a biodiesel state?

[@Duramaxtransporter]

I have a 2016 LML Duramax with 356,000 miles on it. Use truck for my job as an RV transporter. At 334,000 miles the original cp4 pump failed, but did not grenade. Had a new cp4 pump put in at a GM dealership and fuel lines and injectors were not changed as there was no metal that made it to them. Cost was $4k parts and labor. 20k miles later new CP4 pump failed and this time did grenade. Entire fuel system has to be changed out along with injectors. Was told by GM that they would only warranty pump and not entire fuel system. Cost out of pocket now is going to be $7k. A word of advice for anyone with a 2010 thru 2016, do a cp3 conversion now rather than later. Pay the couple grand now rather than $10k-$15k that most places will charge. I will be doing the complete contamination repair and also a cp3 conversion. Eventually that cp4 will fail and when it does you could be stranded on the side of the road pulling a 42 foot park model 4 hours from home as I was.

[@wyattking395]

I have been doing research about the LML trucks so this helped a lot so thank you

[@pv2kio1991]

I just converted mine myself. 2015.5 with 234,000 miles. Took me about 8 total hours of labor, but shops book 12.. saved thousands, and it runs great. Added peace of mind! Used the Lincoln Diesel Specialties kit

[@JWMontoya]

How did your FPR look? any metal shavings?

[@pv2kio1991]

@@JWMontoya I could barely make out 2 or 3 tiny specks on the screen. Good enough to mark my injectors “safe” lol. Thank God! I bought the truck completely stock at 230k just three months ago. Have been running EDT. The intake plenum had 1/4” of soot buildup from the EGR and PCV. I’m going to need to replace that intake with something soon!

[@davidblevins9513]

I’m thinking of going with there kit.

[@pv2kio1991]

@@davidblevins9513 do it!

[@KeithGipe]

I converted my 2015 at 125K before it failed

[@DuramaxKev]

2014. 102,000 and I just did the CP3 Conversion. Among some other fun stuff...Finally. Runs much better now! I don't know why I waited so long. Mine was strictly preventative maintenance since I just hit 100,000 miles. Now a couple weeks prior, a relative of my wife had his CP4 on his 2016 self destruct. So, that was the final wake up call and my wife really started worrying so we pulled the trigger.

[@JWMontoya]

Awesome! glad to hear it's running great.

[@DragsterJeffCrider]

I bought 2013, 2500 with 70,000 miles and replaced the CP four with the CP three pump. A preventative maintenance procedure. I also added an air dog system to the truck. The guy who did the work told me now the truck is now bulletproof. So far so good, 5000 miles into the New fuel system.

[@matthewhutchison9438]

Is it expensive to have somebody swap the cp4 for you?

[@DragsterJeffCrider]

@@matthewhutchison9438 $2600 for the pump kit and the air dog. $2100 to install it all. Banks tuner arrives today.

[@DragsterJeffCrider]

@@matthewhutchison9438 Way cheaper than replacing fuel lines, injectors, cleaning out the fuel tank could cost three times more

[@DragsterJeffCrider]

@@matthewhutchison9438 $2600 for parts and $2000 labor.

[@MrdoallDoanything]

I have 300000km and will be doing cp3 because traveling to USA

[@justinrice6924]

I have a 2015 2500 LML with 115k miles, with a 165 fass lift pump, with exengry fuel regulator installed in my CP4 that way if it does go then it is supposed to catch all metal shavings so it wont reach rest of fuel system-$245.00 upgrade cheap insurance and easy to install in 1 hour. Verus the cp3 $2300 update…. And lots more hours to install.

[@LindaThompson-yf8ph]

120k of bone-stock camper-towing miles and my LML just went in for the CP3 swap.

[@ronaldbabbitt6318]

Lift pump is a must! I agree 👍 I installed a Air Dog 4G 165gph in my Lmm and have tried to advise my brother in law (lml owner) and another friend who has spent 10,000 on new injectors and 7,000 on new fuel rails on his Lmm and still won't consider a lift pump! Same thing with my brother in law! Tho he's on borrowed time with his CP4!? Great advice Brother! RDS Turbo nice upgrades! 🛠🔧☠️🤘🏻💨💨🏁

[@russthomasjr]

Glad your building this truck, I’m looking forward to learning the entire platform

[@madman671000]

I have a 2012 LML, I have not made the conversion but thinking about it, its a farm truck that only has 125K, I use it to tow a hay trailer and such. I add 2 ounces of two cycle oil every other fillup.

[@joshuayoung4731]

2013 285k tows everyday all day weight loss no lift pump living on edge!

[@PublicNuisance304]

My 16 has 145000 on it. I’ve had a fass on it since I bought it in 2019 with 55,000 on it. I’ve always ran an additive whether it be hotshots or diesel power service.

[@JWMontoya]

great way to take care of the CP4 pump

[@kyle-409]

Just bought a 2016 with 145000 miles. I don't know what previous owners did but i run edt every tank and no lift pump yet no delete or tune yet

[@jasonlipka]

I think that one thing people need to consider is that the CP4 issues are bit overblown because of the COST of the failure. You'll hear numbers anywhere from $5k to $15k. I remember reading an article where they had data to show that the actual number of CP4 failures were less than 2%. Now, that's a lot higher than CP3's have, but it's not like you have a 50/50 or even 1 in 5 chance of experiencing a CP4 failure. It is far from the "ticking time bomb" that many people make it out to be in their clickbait videos. If you run an additive (I, too, like hot shot secret EDT or EDTDWAG for winter), odds are you'll never have a problem. And that's really all there is to it. In Europe and Canada, where they don't have Ultra Low Sulfur Diesel (ULSD), CP4 failures are non-existent. Thus, it stands to reason that as long as you make sure the fuel in your truck has as much lubricity as Canadian fuel (and most additives far exceed that), then you are not likely to experience a failure. There are other benefits, as this video points out, especially if you're doing big mods and need the added capacity a CP3 can provide.

[@BladePro2021]

Lots of CP4 failures in Canada , we run Ultra low sulfur diesel here too, had my 2015 lose the first one at 70,000 km / 40,000 miles on warranty, then lost that one with 120,000 km / 75,000 miles with regular filter changes at 10,000 kms/ 6000 miles. Went to a CP3 conversion, a full delete and tuned for heavy pulling , and has been trouble free since,

[@jasonlipka]

@@BladePro2021 Thank you for the insight. I was unaware that Canada was also ULSD. This prompted me to do some more research and it seems the main difference between the US and Canada is that Canada isn't really enforcing the emissions laws in most parts of the country. Thus, although it is technically "illegal" in Canada to delete your diesel, there isn't really widespread enforcement. This is much like the US prior to ~2018. It has always been illegal to delete your diesel here, but it wasn't until the EPA started cracking down in 2018 that there were any real consequences to do it. That's when vendors started getting fined/shut down for selling delete parts and tuning, so now nobody will touch it. All that said, your post drives home the point that the problem isn't necessarily with the CP4 pump itself, it's the ULSD fuel. A good lubricity additive should keep your CP4 reliable. A CP3 conversion does tend to avoid these issues entirely, but you can buy a whole lot of additive for what a CP3 conversion costs, especially if you are going to pay someone to do it. Peace of mind has a value all its own that is difficult to quantify. By no means am I attempting to dissuade people from doing a CP3 conversion (there are other benefits), I'm just merely attempting to tone down the rhetoric that every CP4 is a ticking time bomb that is going to get you sooner rather than later. CP4 disaster prevention kits are another option worthy of consideration that are much lower cost and much easier to install. They're not 100% effective, but they are close to it. They do nothing to prevent your CP4 from failing, but they do minimize the system damage (and thus cost) if you do experience a failure. I would think a disaster prevention kit with a lubricity additive would offer great value for those that are concerned. Most additives have other benefits anyways. ETA - My LML is a 2012 with 190k miles on it. No problems with my CP4. Until a couple years ago, I was unaware of the issues with the CP4's so I would guess I've only been running additive for a couple years now.

[@BladePro2021]

@@jasonlipka I agree, and yes Canada hasnt been over zealous on enforcing the law. You might also be right on the CP4 , my issue is on the manufacture and GM not advising the customer about the known issues and offering an information package in the warranty booklet on ways to help the CP4 last . A bit of info from GM would have saved me thousands of dollars. No where do they mention changing filters way earlier then the change fuel filter range on the dash, nothing about lubricant additives , even after changing one out on warranty they said nothing to help prevent another failure. .

[@brandonthompson-mg9ju]

Which cp3 pump did you go with? I was looking at S&S. They have different models. If you’re deleting I’m assuming there’s no need to pay extra for the pre tuned pump, your tuner should take care of that right?

[@coreyrichardson6350]

I just bought a lml and want a conversion but havnt gotten around to doing it. But it runs good still with 250000 miles

[@Kyleandderek787]

Does your buddy with the silver LML have a channel ? I want to see more of his truck

[@jsosa8905]

LML with 183k with a fass (install at 30k) Original cp4 Runs like a champ

[@RayMccoy-l4p]

I have a 2016 LML with 110,000 miles. When should I start to worry about CP4 failure?

[@rileygraymountain3093]

I have a 2012 lml currently at 215,000 miles... Should I do the CP3 conversion????

[@jesusbarragan3346]

One of my friends has a lml with 700,000 on an no problem with cp4 .

[@marvinburwash1040]

Iam still driving 6.6 Duramax with the CP4 and it’s still running great with 260.000 kilometres it’s never let me down yet, 😅where’s the wood

[@cousins4life0]

I have a 15 lml. (93k) fass lift pump and edt every fill up. Still have the cp4 in it. It's expensive and time-consuming for the conversion, so im praying that I will be ok.

[@sexyworm1000]

Pretty cheap to do it before you needs lines rails and new injectors I’d rather spend 3 grand in preventative than 15-20k on a whole fuel system

[@poorwhiteboy6521]

I have a 2004.5 lly just did new head gaskets now im not getting the high pressure. I put a air dog lift pump. So.e reason im not getting fuel pressure any advice ? Truck was apart for few months.

[@dwarfzerker8456]

Mine 2016 with no egr or def setup and i still have cp4 with fass added and got over 225k miles but never able get cp3 conversion yet cause of cost and bills from credit cards had replace steering with HD cognito setup cause of ball joints were going out and i got turbo boost code p2263 nearly every day unless its cold out and a rarely p128e code pops in a blue moon with p2263 code fer under boost and cant figure out whats issue fer bout year and only thing not did was change turbo cause hate when it goes in limp mode uphill but i would like get rds 64 9blade setup

[@BradleyMiller-h6r]

This is off to pick of that video but would you say it’s worth replacing the Down pipe of a deleted 2019 L5p?

[@buddyrobinson9711]

I did do a cp3 co conversion on my 2013 lml. Should i still get a lift pump?

[@paulgauthier1884]

does the CP4 fuel pressure regulator go back on a CP3 conversion or does ie use a different regulator ?

[@kyle-409]

Im definitely terrified to try ry a cp3 conversion by myself. Its the only ride i have so I can't screw it up 😂

[@pv2kio1991]

It was nerve-wracking for sure! Truck was down for a total of 2 days. Completed with all common hand tools. Just make sure you have 19mm, 22mm, and a 24mm wrenches and some type of small universal/wobble extension for the 10mm y-bridge nuts. I used a large adjustable for the 24mm. Lincoln Diesel Specialties pump+ gasket kit. New Y-bridge gaskets definitely needed for proper sealing.

[@brandonj470p4]

who does the tunes for efi live for the cp3

[@MASON858]

I have a 16. 130,000 miles hadn’t did anything to it. Cause hadn’t found anyone locally to take a look at the thing.

[@JWMontoya]

If you have the space and tools to work on it yourself. You're more than welcome to

[@kyle-409]

Gives me hope 😂

[@Donnazbeenz303]

2011 lml 150,000 cp4. I'm interested in doing a lift pump though just to. Just out of curiosity if you're familiar with it does installing a lift pump set off a check engine light and do you have to unplug the electrical if there is some on the CP4

[@JWMontoya]

It does not throw a code what so ever. I’ve done a video on lift pump installs. This is the lift pump we sell a lot of: jwmotorsportsco.com/collections/airdog-lift-pump/products/airdog-ii-4g-df-165-a6sabc409-duramax-lift-pump

[@dietdrkelp5502]

2011 lml here. 74k miles. Threw a dtc Fuel rail pressure “too low” last week. New to diesels, is this the start of my cp4 failure journey? 🤦‍♂️

[@jasonlipka]

Hard to know. You need to get out a scan tool and monitor actual versus commanded fuel rail pressure. Is the truck tuned? Big power? It's also possible that the fuel filter on the side of the engine needs changed. That can cause low fuel rail pressure. Rule of thumb is change filters every 20k. A single bad load of fuel can necessitate a filter change if it's really dirty. Try the easy stuff first before you assume it's a failing CP4.

[@eddieclark7025]

That’s exactly how my 2011 cp4 failure began. 1 week later the cp4 shelled sending debris all through the fuel system. I ended up doing a cp3 swap and also had to replaces ALL fuel lines and ALL injectors. I saved money doing all the work myself but it still cost me over 5k.

[@SuperJav1er]

So the 17 duramax doesn’t have a cp4 pump wat exactly does it have?

[@kevinfuentes8588]

lp5 have the hp4

[@BergeKirkorian]

i think my cp3 failed. ficm good 2004.5 lly had banks ecotune, banks ram air intake. crank no start. fuse check pass, no codes but still showing check engine light. any thoughts sirs or ma'ams?

[@JWMontoya]

How do you know your FICM is good? Read the codes on the truck first

[@randallarnett2382]

Which kit are u using?Which one do u recommend?

[@JWMontoya]

I used Exergy Sportsman with HSP conversion kit

[@dan197573]

I did one on my 2015 at 90k miles

[@JWMontoya]

How did your FPR look?

[@cousins4life0]

I have a 15 with 93k. Fass lift pump and edt every fill up. Still using cp4 and hoping it will be ok.

[@MrdoallDoanything]

Us fuel is junk, not because of low sulfur .

[@OfficialShaydenAdams]

Yooooooo