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2027 3.0 l Duramax

Sparky134
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newdude Senior Enthusiast

newdude

Posted
Posted
54 minutes ago, Sparky134 said:

Will the the engine be engineered to solve the problems plaguing the 2019-2026 Engines?

 

 

What problems?  

  • Like 1
Atlas Senior Enthusiast

Atlas

Posted
Posted
55 minutes ago, newdude said:

\What problems?  

 

Just a guess based on the mentions I've seen on this forum...

 

Failing coolant control valves (LM2, LZ0)

No start / long crank issues (LM2)

Thrust bearing failures (LZ0)

Timing chain failures (LM2)

 

Fingers crossed GM has more revisions and updates in the work because the 3.0 is awesome (when it can be trusted).

newdude Senior Enthusiast

newdude

Posted
Posted (edited)
1 hour ago, Atlas said:

 

Just a guess based on the mentions I've seen on this forum...

 

Failing coolant control valves (LM2, LZ0)

No start / long crank issues (LM2)

Thrust bearing failures (LZ0)

Timing chain failures (LM2)

 

Fingers crossed GM has more revisions and updates in the work because the 3.0 is awesome (when it can be trusted).

 

 

...was looking to see what the 3 post OP had to say since they've got a personal issue here and 3 different threads they made within the same time period...just today....and then regurgitating that some owners on facebook and other forums have issues which is a small number out of total ownership of 3.0 Duramaxes.  

 

 

 

 

Edited by newdude
  • Like 1
  • Thanks 1
silveradosid Senior Enthusiast

silveradosid

Posted
Posted (edited)

i would say it is someone who bought a deisel and shouldn't have, they arenot meant to put around town or excessive idling. the brake thing is a gm problem, some do worse and some do bettter. i put 140k on my 2014 and was expecting the same on the 2020 but only got half of that mileage. a2020 with40k is not that many miles, my 2020 has 120k

Edited by silveradosid
  • Like 2
  • 2 weeks later...
Jus Cruisin Enthusiast

Jus Cruisin

Posted
Posted

I'll be buying another 3.0l when I replace my 2025 Sierra. I had an issue (engine siezed) but it was replaced and has been fine ever since. I'm spoiled with the excellent fuel economy to swap to a 6 2l or its replacement. 

Coastie05 Enthusiast

Coastie05

Posted
Posted

One can only hope that they will correct or have already corrected the issue. 

  • 2 weeks later...
diyer2 Senior Enthusiast

diyer2

Posted
Posted

I would only own a diesel if I towed regularly.

newdude Senior Enthusiast

newdude

Posted
Posted
On 6/29/2026 at 11:56 AM, Sparky134 said:

 

 

 

Thrust bearing is a very small window.  But nice try.

 

Turbo oil filter?  Haven't seen any failures.  Change your oil more frequently.  Use a better oil than the factory oil.  

  • Like 1
Jake87 Enthusiast

Jake87

Posted
Posted
On 6/14/2026 at 7:38 PM, Atlas said:

 

Just a guess based on the mentions I've seen on this forum...

 

Failing coolant control valves (LM2, LZ0)

No start / long crank issues (LM2)

Thrust bearing failures (LZ0)

Timing chain failures (LM2)

 

Fingers crossed GM has more revisions and updates in the work because the 3.0 is awesome (when it can be trusted).

For the long cranking, I do know this engine is very susceptible to fuel quality. Watch your centene values and bio content. This isn't a Jimmy that will run off of crude. 

Atlas Senior Enthusiast

Atlas

Posted
Posted (edited)
12 minutes ago, Jake87 said:

For the long cranking, I do know this engine is very susceptible to fuel quality. Watch your centene values and bio content. This isn't a Jimmy that will run off of crude. 

 

Our local stations' (basically everywhere) diesel fuel has the minimum required cetane and is up to 20% biodiesel, ULSD. *My* truck runs fine on it. (When I'm not dumping the local choke-and-puke's used fry oil in the tank to save money!) - kidding.

 

I'm not sure the documented long crank issues with some of these engines is fuel related, but fuel can certainly always be suspect. Always good to consider bad fuel as a possible cause.

Edited by Atlas
PunchT37 Enthusiast

PunchT37

Posted
Posted
35 minutes ago, Atlas said:

 

Our local stations' (basically everywhere) diesel fuel has the minimum required cetane and is up to 20% biodiesel, ULSD. *My* truck runs fine on it. (When I'm not dumping the local choke-and-puke's used fry oil in the tank to save money!) - kidding.

 

I'm not sure the documented long crank issues with some of these engines is fuel related, but fuel can certainly always be suspect. Always good to consider bad fuel as a possible cause.

I got a flashback to Smokey and the Bandit.

  • Like 1
Z45 Senior Enthusiast

Z45

Posted
Posted

Problems are blown way out of proportion due to the internet.  The same experiences get repeated over and over again till it sounds like a real problem.   There is NOT an vehicle out there that does not have some issues.  Building 100's of 1,000's of vehicles with 1,000's of parts from various suppliers all over the whole, some quality control issues are going to make it through the process.  The internet is full of misinformation often designed to change readers opinions. 

 

I have had 2 trouble free years with my 2024 Sierra, don't tow anything heavier than a 2026 Ranger NorthStar and mostly a around town. I personally know 3 others with same engine and no issues, 2 are LM2 version and 1 is the LZO, all three happen to be GMC's.  All of these owners are older persons (40+) so that may have a lot to do with it. No modifications, no big tires, suspension hacks etc, just normal use.  One who has a 2021 LM2 has over 100,000 miles and travels estimating projects for the electrical contracting company.  

  • Like 3
StingerZ16 Enthusiast

StingerZ16

Posted
Posted
23 hours ago, Z45 said:

Problems are blown way out of proportion due to the internet.

This happens with anything.

As you stated all vehicles with have a failure rate of some kind. It is expected. I just don't want it to be mine :)

Failure should make things stronger.

Maybe AI will find weak points during design and help build better machines with less failure rate. (until it takes over)

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