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LZ0 3.0 Duramax: GM Flags Crankshaft End Play Behind Bellhousing Noise & P06DD (25-NA-307)
GM bulletin 25-NA-307 (LZ0 3.0 Duramax, 2025–2026) links bellhousing-area noise + MIL/P06DD to excessive crankshaft end play (possible thrust-bearing failure). Dealers should measure end play at the crank pulley bolt with a dial indicator; spec is 0.084–0.316 mm (0.0033–0.0124 in). Expect to pay diagnostic time for the check; if out of spec, repairs proceed per SI.
59 minutes ago
GM Issues New Valve-Body Repair for P0747 on 10-Speed (10L80/10L90)
GM has issued TSB #25-NA-255 for 2021–2024 trucks and SUVs with the 10-speed. Instead of replacing the valve body for P0747, the fix now calls for a new feed-limit valve, spring, and spacer plate—marking a major shift in how dealers handle this common transmission failure.
Sep 23
LM2 3.0 Duramax: GM Issues Special Coverage for Coolant Control Valve (N252508341)
Release: September 2025 • Bulletin: N252508341 • Applies to (LM2 3.0L Duramax):Chevrolet: Silverado 1500 (2021–2022), Suburban...
Sep 16
LZ0 3.0 Duramax: GM Issues Special Coverage for Coolant Control Valve (N252508340)
Release: September 2025 • Bulletin: N252508340 • Applies to: 2023 Chevrolet Silverado 1500 / 2023 GMC Sierra 1500 with LZ0 3.0L...
Sep 16
Can the 3.0 Duramax Diesel Tow? My 1,425-Mile Trailer Test
You’ve seen the window sticker. You’ve read the marketing. And if you’re like me, you’ve probably asked yourself: “Okay, but can this...
Sep 6
P2C7A on the 3.0 Duramax (LM2/LZ0): Causes, Diagnosis, and Proven Fixes
P2C7A on the 3.0 Duramax means the SCR/NOx catalyst isn’t meeting efficiency. Learn the real causes, exact diagnostics, and fixes for LM2/LZ0.
Sep 4
ECM Service Update N252510321: What Owners Need to Know (Aug 14, 2025)
GM has released Service Update #N252510321 for select Cadillac, Chevrolet, and GMC vehicles. This is a phased launch rolling out August...
Aug 19
EPA Issues Guidance to Fix DEF Derates: What the New Rule Means for Your 3.0 Duramax
If you’ve been driving your 3.0 Duramax-equipped truck or SUV, you're likely familiar with the frustration of a Diesel Exhaust Fluid...
Aug 12
EPA's 2027 Emissions Standards: What It Means for Your 3.0 Duramax Diesel
The landscape of automotive emissions is constantly evolving, and for Duramax diesel enthusiasts, a significant change is on the horizon....
Jul 19
The Devastating Consequences of Fuel Contamination in Your Duramax Diesel: DEF vs. Gasoline
For Duramax diesel owners, the fuel system is the lifeline of your vehicle’s performance, delivering the power and efficiency you rely...
Jul 6
Towing Troubles: 3.0 Duramax DEF Warning That Doesn't Make Sense
For many 3.0L Duramax owners, especially those with 2023+ LZ0 models who frequently tow, a new and deeply frustrating phenomenon is...
Jul 3
3.0 Duramax Diesel Fuel Filter Showdown: WIX vs ACDelco vs Doc’s Diesel vs Knockoff
When it comes to protecting your 3.0L Duramax Diesel engine, few components are as critical—and as misunderstood—as the fuel filter. For...
May 24
Why I Switched from 0W20 to 5W30 in My 3.0 Duramax — And What Oil Analysis Revealed
Video Reference: I STOPPED USING 0W20 - My Oil Analysis said 5W30 is Safer When it comes to maintaining the longevity and performance of...
May 20
The $10,000 3.0 Duramax Timing Chain Flaw – What GM Fixed and How to Protect Your Truck
Posted on April 15, 2025 Owning a Duramax diesel is a point of pride, but it comes with the responsibility of staying on top of...
Apr 15
Understanding and Replacing the P04FB Crankcase Pressure Sensor on the 3.0 Duramax Diesel
If you’re a 3.0 Duramax Diesel owner, you’ve likely heard of the P04FB code—it’s one of the most common diagnostic trouble codes (DTCs)...
Mar 28
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