Chevy 2500 6.6L DURAMAX Diesel (L5P) Top 5 Issues *Heavy Mechanic Review* | Should YOU be Worried?

I Review the New 2024 Chevy/GMC 2500 HD 6.6L Duramax Diesel L5P Engine. I discuss everything Wrong with the second gen L5P Duramax diesel including Fueling issues, Aftertreatment and Emission related issues, the New Global B Electronic system in these HD trucks, I also go over the MAP sensor issues and Injector Connection issues with the L5P Duramax Diesels.

Full MAP sensor Cleaning

What I Use:

Towing Gear:

My Camera Gear:

The1 first Issues for these updated second gen L5P duramax engines is a fueling problem. when these engines first came out in 2023 they were getting poor fuel economy and at times running rough. turned out there was some faulty software causing the injectors to over-fuel and the recall was released by GM to correct this software bug.

the next issues or concern is the New electronic system that is in the 2024 HD truck platform known as Global B. this complex electrical system allows for over the air software updates and in my opinion has potentially contributed to a greater amount of check engine lights.

Thirdly is the MAP sensor getting clogged with soot, pretty easy fix but certainly something to keep an eye on.

the fourth issues involved the injector 4 on these duramax engines, the connector was fail causing a missfire on the first gen L5P diesel engines. GM released an service bulletin and this has hopefully resolved this issues going forward with these new engines.

the last issues and maybe the most contiversial is the crankshaft pins breaking causing engine failure. aparently the dowel pins holding on the timing gears and harmonic balancer can fail and cause engine failure. I give you my opinon on this.

lastly I quickly discuss how I wish the duramax stroke was longer something like what ford has done to help create torque.

Hope you guys liked the video.

00:00 - Intro
00:55 - Fuelling Issue
01:37 - Check Engine Lights/ Global B
06:41 - Injector 4 Connector Failure
07:23 - MAP Sensor Issue
08:54 - CrankShaft Pin Breaking
11:41 - Short Stroke
13:23 - Conclusion

[SoonerMikeD]

First selling driver habits info to insurance companies and now monitoring you if you make mods to something you paid a minimum of $70k for to last longer. Screw General Motors.

[michaelpopp]

The EPA sucks. Please vote any supporters of emissions controls out of office. We need to roll backwards on this.

[JH-koej]

I have a 24 L5P, stock, with a little over 20k miles. Half of that towing. I’ve had no issues at all. Tows up the western mountains with ease. I am very pleased with the truck, 10 speed trany and the engine.

[chadmiller]

I have a new 6.6 gas 3500 dually. I've put over 60, 000 mi on it in just over a year. I tow 6 days a week. This truck has been worked very hard and has literally had zero issues. If you're towing under 15, 000 lb and need a high payload I definitely recommend the 6.6 gas.

[chrisrobichaud]

When we are already making near 1000 lbs/feet of torque, the under vs over square starts to become less important. The l5p is a solid engine and should definately be a consideration for anyone looking to haul

[jakewilson]

I’ve always found it funny whenever people comment “I’ll keep my 7.3” on videos reviewing new trucks, however I’m starting to see why people are hating newer trucks. I have a 2017 L5P for a personal truck that I think I’m going to keep forever now. I really believe besides those and the 17-19 super duties will be the last good diesels ever made

[rp]

Also would like to add, thank you for your information on ( Map) sensor 😊 YES I have taken mine off, not as dirty as the one you show, but boy it's so easy and simple to unbolt, clean, and make it pretty again
A big thank you for showing that service that any owner can do on their own. Another thing I do is raise the hood and let the rain water drain from the Rubber Boot attached to the hood. I just like to get rid of that water just about every time I start my baby 😊

[emso]

Makes me want to keep my old 1995 gmc 2500

[fanflyer]

My 2024 HD Ultimate made it 1 mile from dealership before check engine light and Christmas tree. Bad sensor front right, fixed day later. Concerning that these types of things are commonplace .

[RandomStuff-ztqf]

10:15 the Dealer replaced the crankshaft gasket on mine, but they reused that long bolt (manual says you must use a new bolt)... long story short the bolt sheered off, the harmonic balancer spun and it destroyed my entire engine, leaving us stranded hundreds of miles from home. Never buy a vehicle from Varney GMC in Bangor, Maine. Biggest ripoff crooks and liars out there and completely incompetent! (hint, they also returned my wife's Escalade with the wheel falling off because they never tightened the new ball joints).

[brianb]

I had my 24 for 4 months and put 20000 miles on it, better then the 24 Ford power stroke I got rid of, with nothing but trouble I had with the engine.

[__Dave__]

More like “over the air turn your truck off when your social credit score drops below 500”

Somehow we’ve gotten by just fine with air gapped transportation since we started riding horses, no need to start connecting things now

[chriss]

The OTA updates are an issue with f150s as well. On my 21 3.0 Powerstroke, I’ve only had one update come through since new and there have been countless updates apparently pushed out over that course of time. But hearing about guys getting OTA updates and then things stop working (head units brick, running lights malfunction, etc), I’ve actually turned off the auto updates altogether…..don’t want them. My fear is that now that the warranty is up, whatever ford screws up with an update will be on my dime to fix and I’m not ok with that.

[austinkeen]

As a 6.6L owner, I have to say it's easily one of the trucks ever produced.

Putting heavy workload miles on it day after day, has taught me that it has the gm engine recently made, maybe even of all time!

[Slckr]

Great information, good stuff! An over-the-air update caused my 2022 F-150 King Ranch 5.0 to spend over a week in the shop. They pushed an update that told the truck it had a feature it didn't (park assist). Was an absolute mess, thet had to send an engineer to fix it, told me to disable updates for a "while". I'm convinced it was a mistake by some rookie developer. Looking forward to the next video!

[kmonto]

Just wait when your social score goes down because you dislike a post or a tweet, they make you start walking...

[motoxdudeNV-UT]

OTA software updates... what could POSSIBLY GO WRONG?

[travisharms]

Global B gives me the feeling like you never really own your truck.

I get that there’s many great advantages to these new trucks and the engineering in them, but there’s also downsides.

I don’t mean to be a conspiracy theorist lol

[thelos]

Absolutely no reason the big 3 can't put out a bulletproof diesel motor on this modern era. Instead of focusing on making more horsepower and torque, they should fully abuse the engines for 2 years and make a good product

[alexandermckay]

Alex, what do you think about wet belt engines. Not just DuraMax, any of them. I've heard that Ford is having a hell of a time in the U.K. with their small diesels not being able to make past 100K miles because the oil system gets clogged from the belt disintegrating and the engine goes. And they're not warrantying it. The theory goes that if they do it once it'll open such a can of worms and cost them a fortune, that they deny any claims.