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GM Investigates Early P2463 Issues on the 2026 LZ0 Duramax Diesel

GM’s new PIE0883 bulletin investigates P2463 soot-loading issues on 2026 LZ0 Duramax engines. Dealers are asked to inspect sensors, airflow leaks, and installation quality before repairs. This follows the earlier crankshaft end-play bulletin (25-NA-307), marking another early reliability concern for the LZ0.

Is Dexron ULV Behind GM’s New Vibration Bulletin? What the Data Suggests — And What #25-NA-369 Actually Says - 10L80

GM’s new 25-NA-369 bulletin tackles steady-speed vibration between 25–80 mph on 2021–2026 1500 trucks and SUVs. While many assume torque-converter shudder, the bulletin shows how sensitive the 10-speed is to Dexron ULV fluid condition and explains how to diagnose other common causes. GM requires a structured GDS/PICO diagnosis and a 20-quart ULV exchange only when TCC shudder is verified.

Updated GM Bulletin # 25-NA-185 : Engine Coolant Control Valve Failures on 3.0L Duramax (Dec 4, 2025)

GM has updated bulletin #25-NA-185 for 3.0L Duramax coolant control valve failures, expanding coverage and requiring ECM calibration checks during replacement. Two related Special Coverages (N252508341 for LM2 and N252508340 for 2023 LZ0) may provide 15-year/150k-mile protection depending on VIN. This update clarifies repair paths and coverage options for owners.

6.6L Duramax Diesel Engine

New GM Emissions Recall N242438500: 2024 L5P Duramax SCR Fault Detection

General Motors has launched a new emissions recall that affects certain 2024 Chevrolet Silverado HD and GMC Sierra HD trucks equipped with the 6.6L L5P Duramax. Recall ID: N242438500 Title: ECM OBD – Selective Catalyst Reduction (SCR) Fault Detection Release Date: November 2025 Applies To: 2024 Chevrolet Silverado 2500HD / 3500HD (L5P 6.6L Duramax) 2024 GMC Sierra 2500HD / 3500HD (L5P 6.6L Duramax) This is a voluntary emissions recall focused on the software that monitors

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...

3.0L Duramax Diesel Engine

The 3.0 Duramax Goes to Sea: Why the OXE Marine + GM Deal Is Good News for Owners

When news broke that OXE Marine and GM Marine had signed a development agreement to use Duramax engines in a new generation of diesel outboards, most people saw it as a marine story. For 3.0 Duramax owners, it is something else entirely: It’s a strong signal that GM sees the LZ0 3.0L Duramax inline-six as a long-term platform, not a short-lived experiment. In this article, we’ll break down what the agreement actually says, why it matters for truck and SUV owners, and how a

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...

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,...