All About the Duramax LML | Common Problems & Reliability
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- Опубликовано: 4 июн 2024
- Boosted Performance is now LIVE! LML Performance Parts: boostedperformance.com/durama...
In this video, Jake covers the Duramax LML engine. The LML was released in 2011 and was produced until 2016 when the L5P took over production! He covers the differences between the LMM and LML, common problems, reliability, and more for the Duramax LML engine. The article linked below, written by us, is a more in-depth guide on the common problems (symptoms & causes) and reliability with this engine: chevytrucks.org/duramax-lml-e...
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00:31 - Differences Between the Duramax LMM vs LML
02:24 - Duramax LML Common Problem #1 - CP4.2 Injection Pump
05:01 - Duramax LML Common Problem #2 - DEF Heater
06:13 - Duramax LML Common Problem #3 - NOx Sensors
07:24 - Duramax LML Common Problem #4 - DEF Pump
07:57 - Duramax LML Reliability 
Авто/Мото
The fuel pump on my 2002 Sierra died this week so I had to take it in for replacement. I have a 2015 Sierra LML that I typically don't drive in the winter - I use the 02. Since the 02 is now in the shop, I have to drive the 2015. We've had really low temps (@ 4 days with highs in the minus zero range). The past week it's been in the upper 30's to low/mid 40's. When I started the 2015 it struggled to start - took 5-6 attempts and finally started. However, the "engine" icon lit and has stayed on. There's no message anywhere (I had to have the 2015 DEF system serviced/replaced by a Chevy dealer a couple of years ago under warranty) and at that time I got a message to check the DEF system with the speed reduction notice.
The shop that's working on my 02 doesn't have the ability to read diesel codes if there are any (the 2015 has 48,000+ miles). I did have it's fuel filter replaced this past summer so probably less than 3,000 miles on. The nearest dealer that serviced the 2015 for the DEF repair is @ 55 miles away (I drove it there and they gave me a ride back home, then picked me up when the work was done so no complaints there).
The owners manual just says to check the emissions system when this icon lights and stays on. I haven't tried disconnecting the batteries to see if that does anything (a Duramax forum member said that "fixed" his problem). As it's now the weekend I can't contact the dealer until Monday.
Any ideas/suggestions in the meantime?
I love your videos so educational, have you done the same on the Cummins series and power strokes as well ?
Hus - Thanks for the feedback! We have made quite a few Cummins and Powerstroke content, but not to the extent of the Duramax's. Are there any that you want to see in particular? We'll add them to our list.
@@8020Media the way you break down your videos I'd love them all lol 89-12 dodge 13-present rams, 94-present powerstrokes. I'm convinced if I ever go duramax I'd choose LML with no emissions
H - Sounds good! We'll keep doing them. We do have an LML mod guide in the works and will likely come out on the 11th. Make sure to stay tuned!
Thanks for this video. Very informative. Im on the edge - days away from buying a 2016 GMC 3500hd Denali Duramax with 81k. An unmolested beauty in incredible condition. Replacing my 2009 Sierra which has nearly 600k. Keep up the great work - im a new subscriber!
THDC - Wow! 600k, that is impressive! Sounds like take great care of your machines. The new truck is going to be a beast.... Keep us updated on this!
Looking to buy a 16’ LML 170k already tuned/deleted.they had it 4 years no problem super clean. Shop just did some suspension work and checked the fuel system everything was fine but it’s still on the stock cp4
Well the delete is definitely a positive, 170k without CP4 issues is good but certainly wouldn't hurt to reinforce it a bit or replace it given mileage on it.
I plan on upgrading from LWN to LML, it’s already on a diet but is there way I can look and see if it already has a cp3?
Cull - It would be quite difficult to see in the engine bay, but only thing you could do is ask the owner.
What do guys think of the 2012 lml 6.6 any word in them truck about to buy one buy skeptical if I should go with a ram Cummins or Silverado
I suppose that really depends what you are trying to do with it but more importantly what matters is the condition of the truck and how well it has been maintained. If you're looking at 2012 as a year in general I'd probably get a Cummins but that's just me. That platform had at least been around since 2007.5 and isn't one of the first few years of a new platform like a 2012 LML is, and earlier model 6.7 Powerstrokes are known to be a bit more problematic too, mostly just early kinks from a new engine.
Not to say an LML is a bad choice by any means. Just depends the condition it's in and what you're trying to do with it.
do you have any opinions on the crankshaft? I'm looking at buying a 2011 LML with 180,000 miles, but I've heard some stories of the crank breaking because of the firing order. is this a common issue?
Definitely not common, I wouldn't worry about the crank unless you are planning a high horsepower build. The crank is known to have issues but not really until you start talking about 700whp+ or big torque numbers
2015 4x4 LML here, remove all that emissions crap, swap to CP3 and lift pump, it’ll be the best thing you ever did for your truck. She’s currently at 260k and still purrs like a kitten and I have no intentions of letting her go anytime in the foreseeable future.
D - We can't recommend, but yes you are correct! Very well said. Thanks for sharing your experience.
@@8020Media completely understand brother, I live in Mexico.
I need info on wiring harness
S - What information?
Actually, the DEF heater problem affects all users. If a heater fails, even at temperatures well above freezing, you still end up in limp mode. I know because I had a tank heater fail en-route to Alaska in the Yukon, 130 miles from Whitehorse. The warning appeared on the DIC, and informed me that I had 150 miles to go before I'd be limited to 4 mph. We got back to Whitehorse and spent a week waiting for a new tank (you can't just replace the heater). You'd think the bright bulbs who impose these limits would design a better system, and allow more miles.
James - Thanks for sharing your experience! This will be helpful for future viewers.
Does it solve most of the problems by deleting the def system ?
Brayan - Most, yes. Emissions systems, unfortunately, made Duramax's and other diesel engines less reliable.
Just picked up a lml all stock 80k miles on it
Austin - Nice! Do you have any plans of modding?
So delete it. & Cp3 Swap. Got it lets start saving? What would be the price on all these parts? Im not worried about labor.
T - Pretty much. Here's an article that will help you out with your research: chevytrucks.org/best-duramax-lml-performance-mods/
I seen a 08 130,xxx miles i have a 97 f150 should i get it?
G - What engine?
The CP3 also uses diesel to cool it
Mark - What?
I’m looking to buy a deisel more for the power and other big truck things , I just put over 300k on my 05 Yukon and wanting a pickup im currently looking at a 2006 duramax with 191k and 2011 duramax with 136k. Definitely hoping to get something just as reliable as my yukon was
LML is good if you delete everything. Otherwise my preference would probably be the LLY - just do the necessary cooling upgrades and make sure it's been taken care of.
@@8020Media thank you so much for replying, preciate it.
W - Keep us updated!
@@8020Media will do.
So far... biggest issues with my lml.. is emmisions. Plan on deleting that.
I had to replace egr bypass, egr valve, egr pipe cracked, for some measure of reliability i replaced egr coolers with aftermarket "Bulletproof".
Idk.. sick of messing with my lml, i want to play with my l5p finally
N - This seems to be a common them and why delete kits are so popular. Sorry to hear about your experience.
@@8020Media you guys are badass. Never would i say tho.. lml is bad engine. One of the best, great sounding power houses of an engine. Just have to live in a emmision free county to take full advantage
We appreciate it.💪🏻
There’s much more to mess with on l5ps than lmls… parts are more expensive… there’s many more emissions parts & related sensors… tuning is wayyy more expensive.
L5p is the way to go though if looking to upgraded and to get a newer warranty for all of those parts. So depending on what your do with your trucks, ymmv
Reckless - Very true.
My def tank and dpf somehow fell off and haven't had any problems since 🤷♂️ So weird
Damn potholes!
What’s the avg life span of one of these motors. Everything I’ve read says 200,000 you say 3-400,000 but I haven’t seen many websites saying that
S - Average is likely 200, but we've seen many in the 300's. It all depends on maintenance.
My 13 has 395k km. Def has been deleted. If you used a fuel lubricant, swap out the factory cp4 for an aftermarket cp4 or do a cp3 conversion, add a lift pump, do an emissions delete, you'll never have an issue. Motor will last forever.
N - Thanks for taking the time to share your experience! Sounds like you've got a nice build.
Looking at a work truck model l
Regular cab king bed truck this weekend for 10,500. Has 280k been D & T and lots of maintenance. Anything I should worry about you think?
Jaxon - If maintenance has been kept up with then those could go for 500k+ miles.
LML was from 2011-2016, are mid to later years less prone to these "issues"?
D - In our opinion, mid to later years (2013-2016) would be better.
@@8020Media came across a 2015 with 70k miles and am concerned with the cp4 issue
D - The CP4's certainly aren't the most reliable. We think this may be helpful for your research: chevytrucks.org/duramax-lml-engine-problems/
@@dskize1my 15 lml cp4 just crapped out at 230k so i would say the truck is worth buying but be sure to use a fuel lubricant and ride on..repair cost is $12k.. ps..the 9th injector didn’t come with the repair kit so the mechanic bought it separately.
@@tobysmarts thank you very much for your comment. I truly appreciate it!!
Couple more things TCM failure and electronic fan clutch failure. I also had the low pressure P/S hose come off of the P/S pump. I just got rid of my LML. A money pit!!!
Tim - Thanks for sharing this experience. Can you share what mileage you sold it at and/or when the problems were occuring?
@@8020Media I traded it in about a month ago with just over 112K miles. I have the service records and I can reply back on the mileage when service work was done. Beautiful LML and I was noticing a vibration holding the steering wheel when stopped like the engine was out of balance so I said to myself no way am I paying a shop to tear into this to find the reason. It was maybe 6 months before I had the CP3 changed and took it up the *** for that expense. With no hope on the GM clas action lawsuit I said I am not paying for anything else. Gone!
Got it - Thanks for taking the time to share this! Sorry to hear about your LML. What are you in now?
@@8020Media A crotch rocket 2SS Camaro. Now I find out about GM's dirty secret called AFM/DoD. That crap is coming off and permanently disabled. I'm not replacing lifters or some motor because of it.
Unfortunately, a lot of brands are moving towards it.. Love a nice Camaro!
Why would you not recommend deleting the entire emissions system if it is going to make your truck that much more reliable?
There is a lot of legal reasons not to do it - really depends where you live and what the emissions testing requirements are. Starting to give out pretty hefty fines to people who get caught with deleted trucks and shops are getting hit hard too so if you can't do it yourself it's difficult to get it done.
If you don’t live in a liberal state do the delete. Plenty shops still do it you just have to go in there and talk.
Boy you dumb dum.
Because RUclips as well as many other social media outlets, work with the US government to illegally spy on its citizens, thanks to the "Patriot Act", and it only takes one call from a unelected bureaucrat in the EPA to demonetize your account if you suggest, teach, or inform people about things that go against their narrative or their interests... Diesel shops that have RUclips channels have been shut down and or fined by the tyrants in the EPA for teaching people how to do it or shops that do deletes... if you think that the US is a free country, guess again! Keep voting democrat and soon we will have Soviet and Chinese style gulags!
@@8020Media people just don’t have common sense getting hard to find😂 but thanks man I don’t know either to get a L5 P or lml because I’m a pipeliner and I don’t wanna spend all the money on a truck if I can get the same thing for cheaper lol
So deleting and new cp3 swap.
J - We can't recommend this, but basically.
426 cu in
426 cu in equals liters
426 cu in equals 7.1 lt
Phil - We aren't entirely sure what you're getting at here.
Just did a full delete on my 2011 gmc after dealing with def and egr and being stuck in limp mode heading home from seattle , man ol man rooling that cole shure makes my baby scream for joy ....enjoy the government rules poot n nannys
With the tirade the government is on, and as a business, hope you understand we can't go making those recommendations. But we understand the benefits and reasonings for why people do it
@8020Media I also live in north Idaho, a few hours from Canada
Lotta mountains ,Lotta F the government low key lifestyle
It's just how we do things in the 208
Man I'm thankful to be from beautiful coeur d alene
Tyler - Love hearing this XD Thanks for sharing.
definitely delete the truck. lmao that’s a no brainer
William - We can't advise this, but you are not wrong.
@@8020Media I have an LML with 189k miles emissions still equipped cp4 going strong. run hotshots EDT every tank. but warranty just expired so that’s my next move. Cp3 conversion / Tuned & Deleted.
all about how you maintain the truck.
Sounds like you've got quite the rig! Keep us updated on how this goes.
@@williamthompson4000can I see your rig ?
bl bla bla bla
B - Oh really? What's your opinion?
my lml has 140k. shes deleted and runs like a champ. fingers crossed my truck was built midweek and not on a friday.
E - Thanks for sharing your experience! It sounds like you've got a good one!