2025 - 2026 3.0 LZ0 Crankshaft End Play

JohnMr19 · November 8, 2025

Has anyone here experienced issues with this? GM has issued a bulletin (25-NA-307) for bellhousing noise and P06DD for 2025 - 2026 3.0 Duramax LZ0's. Too much crankshaft end play from thrust bearing wear could lead to engine failure. I just purchased my 2026 Silverado HC specifically with the LZ0 because I had one in 2023 that had zero issues and loved it. I wanted to avoid the lifter and crankshaft bearing issues the V8's have been experiencing (had a 6.2 with lifter failure) and was hoping for years of trouble-free reliability as this will likely be my last new truck as retirement is getting closer. So far I have just over 2,200 miles with zero issues and don't seem to have used any oil yet. I'm wondering just how wide spread this issue could be.

https://www.duramaxnews.com/post/lz0-3-0-duramax-gm-flags-crankshaft-end-play-behind-bellhousing-noise-p06dd-25-na-307

Edited November 8, 2025 by JohnMr19
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SPASierra · November 18, 2025

Based on the numbers from the site you posted, it isn't a widespread issue yet. I have just over 3300 miles on my 2025, and will just keep an eye on it.

newdude · November 18, 2025

We had one fail prior to the TSB coming out. Had about 5500mi on it. Happened in July this year. It ran and had no noise but had the P06DD set and low oil pressure. Tech pulled the oil pan and it was grey anti-sieze colored engine oil all over the place, and the thrust bearing sides were ejected into the pan.

I don't have a picture of the oil and oil pan, but here's the pieces of the thrust bearing side and what it's supposed to look like. For whatever reason on the LM2 and LZ0 Duramax, and L3B Turbomax, the thrust bearing is a three piece unit. So there is the upper bearing shell and then another p/n for the thrust sides of it. On the V8s though, the thrust looks the same but the sides of it are clipped to the bearing and not just loose installed next to the bearing separately.

I won't be shocked if more show up across the US, even if its a small number of failures. There's been a few in the GM Technician Facebook group already.

Edited November 18, 2025 by newdude

Atlas · November 18, 2025

I'm aware of the issue, and have just over 1400 miles on my 2025. It's sad because I was avoiding DFM (5.3), failing 6.2's, and the 2.7 wasn't for me. Now this is floating around in the back of my head. Should we drive it to Thanksgiving (700 mile road trip) or leave it parked that week and put miles on it when we're not on a tight timeline.

The engine doesn't seem to have used any oil. I changed it at 500 and will change it again at 1500 now that I'm keeping an eye on this issue. Oil changes won't prevent the issue, but if I'm seeing metallic, I want to try to catch the issue early.

customboss · November 18, 2025

1 hour ago, Atlas said:

I'm aware of the issue, and have just over 1400 miles on my 2025. It's sad because I was avoiding DFM (5.3), failing 6.2's, and the 2.7 wasn't for me. Now this is floating around in the back of my head. Should we drive it to Thanksgiving (700 mile road trip) or leave it parked that week and put miles on it when we're not on a tight timeline.

The engine doesn't seem to have used any oil. I changed it at 500 and will change it again at 1500 now that I'm keeping an eye on this issue. Oil changes won't prevent the issue, but if I'm seeing metallic, I want to try to catch the issue early.

Drive it.

JohnMr19 · November 22, 2025

I just completed my fourth 540-mile trip today and the truck continues to run flawlessly. Just went over 3,100 miles and it still hasn't used any oil. I'm keeping my fingers crossed! I'm assuming they won't measure the end play unless the truck starts making noise and/or throws the code?

newdude · November 22, 2025

21 minutes ago, JohnMr19 said:

I just completed my fourth 540-mile trip today and the truck continues to run flawlessly. Just went over 3,100 miles and it still hasn't used any oil. I'm keeping my fingers crossed! I'm assuming they won't measure the end play unless the truck starts making noise and/or throws the code?

Correct. If you hear noise or that code is present and you take it in for diagnostics, the TSB should be followed by the dealer to determine if it needs an engine based on thrust measurements.

Jus Cruisin · November 22, 2025

My 3.0l engine failed at 5,403 miles. It just stopped running while accelerating away from a roundabout. No warning, no dash lights. Just quit and I coasted to a stop. I had steering. A message popped up on the screen that read "please restart engine" or something like that. It wouldn't and it was towed to the dealership. They determined it siezed. GM didn't pay for them to tear it down, just immediately approved a new engine. I doubt I'll ever find out what failed. It took 50 days to get the truck back. I have 300 miles on the truck since and it's running just fine. Fingers crossed it was a fluke.

Fuelie · November 24, 2025

I. have 22K on my 25 Sierra Denali and no problems. I hope it stays that way

Tom

JohnMr19 · November 25, 2025

I should mention the truck does have one issue that is completely unrelated to the topic, but is still frustrating. I've had to re-pair my iPhone four or five times since I bought the truck. Apple Car Play will randomly not work on startup and when I check my bluetooth settings, my phone is no longer listed. When I try to pair from the phone, it fails and I have to "Forget" the connection. It just did a OTA update recently and I hoped that would fix the issue, but it's happened again since then. I believe it happens when I remote start the truck. At other times it will work, but can take longer to finally connect. Not a deal breaker for the truck, but frustrating none the less.

JohnMr19 · December 29, 2025

I have 4500 miles on the truck and no issues whatsoever. I even towed my cargo trailer 550 miles without any issues. Roads were pretty crappy, so it was slow going but the truck got around 15 MPG towing. So far so good - fingers crossed!

T-Town-Z · January 9

I was looking to purchase one of the 3.0 Duramax trucks back in the fall, but then started reading about the bearing failures. I decided to hold off at that time.

I'm ready to go shopping again. Does anyone know if there was a date range of when the bad engines (and trucks) were produced and if GM has it taken care of it yet ?

Atlas · January 28

On 1/9/2026 at 8:51 AM, T-Town-Z said:

I was looking to purchase one of the 3.0 Duramax trucks back in the fall, but then started reading about the bearing failures. I decided to hold off at that time.

I'm ready to go shopping again. Does anyone know if there was a date range of when the bad engines (and trucks) were produced and if GM has it taken care of it yet ?

GM's lack of information is frustrating. I have a feeling they might know by now which VINs are potentially affected but as far as I know they're not saying. Model year 2026 trucks are said to be affected based on what some of the dealer techs who run Youtube channels are saying. Build dates are anywhere from mid-late 2024 for model year 2025 trucks, through trucks currently being built. There are reports of repeated failures, i.e replacement thrust bearings also failing.

Atlas · January 28

1700 miles on my truck. This is such an ugly cloud hanging over this vehicle, and in the back of my head. I've been through one of these before with another vehicle, an FCA product with a 3.6 pentastar... manufacturer wouldn't do anything about a manufacturing defect until failure occurs. In that case I was left waiting and wondering for 3 years if the engine was just going to suddenly fail, and eventually it did. That's just an incredibly sucky ownership experience. GM should do better. @GMCustomerService

I've thought about just getting rid of this truck. But what would I replace it with? Not a 6.2..ha! 5.3 is said to be going away, and there's no way in hell I'm buying a first model year engine from GM or anyone else when the 2027 trucks come out.

Mine is a Feb 2025 build date which puts it right in the line of fire for all the reported failures.

Edited January 28 by Atlas