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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.

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.

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...

6.6L Duramax Diesel Engine

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...

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...

The Great Debate: To Plug or Not to Plug - Block Heaters in Duramax Diesel Engines

Welcome to DuramaxNews.com , where we dive deep into everything regarding Duramax diesel engines in Chevrolet Silverado and GMC Sierra...

3.0L Duramax Diesel Engine

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...

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...

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....

Other Diesel News

RECALL - Automatic Exterior Lights May Not Activate As Required

NOTE- Canadian Trucks Only N232431050-10: CMVSS Noncompliance Recall - Automatic Exterior Lights May Not Activate As Required - (Mar 26,...

Buyers Market -

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.

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.

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...