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10L80 Erratic Shifting Explained: New GM Bulletin Identifies Spacer Plate & Check Ball Failure
Erratic shifting, harsh gear changes, and transmission codes on your 10L80 may not be a software issue at all. A new GM bulletin reveals a hidden hydraulic failure inside the valve body that can mimic electronic problems—and explains why many trucks are misdiagnosed before the real cause is found.
LZ0 Pickup Truck Calibration Releases (Feb 6, 2026)
GM Bulletin #26-NA-052 applies to 2026 Silverado and Sierra 1500 trucks equipped with the 3.0L LZ0 Duramax diesel. The bulletin addresses multiple fuel system and aftertreatment–related DTCs, including forced engine shutdown and emissions efficiency faults, and resolves them through an Engine Control Module calibration update—no parts required.
LZ0 Gets Calibration Updates For 2025 SUV's - 3.0 Duramax Diesel
GM Bulletin 26-NA-033 explains ECM calibration updates for 2025 LZ0 Duramax SUVs addressing MIL warnings and multiple DTCs caused by software anomalies.
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
LZ0 Gets Calibration Updates For 2025 SUV's - 3.0 Duramax Diesel
GM Bulletin 26-NA-033 explains ECM calibration updates for 2025 LZ0 Duramax SUVs addressing MIL warnings and multiple DTCs caused by software anomalies.
Trailer Light Test Returns to the myChevrolet & myGMC Apps
GM has quietly brought back a feature that a lot of truck owners asked for — the Trailer Light Test inside the myChevrolet and myGMC mobile apps. If you tow regularly, this is one of those small updates that actually makes life easier. What Is the Trailer Light Test? The Trailer Light Test allows you to cycle your trailer lights directly from your phone , so you can stand behind the trailer and confirm everything is working — without climbing in and out of the cab. The tes
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
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 -
10L80 Erratic Shifting Explained: New GM Bulletin Identifies Spacer Plate & Check Ball Failure
Erratic shifting, harsh gear changes, and transmission codes on your 10L80 may not be a software issue at all. A new GM bulletin reveals a hidden hydraulic failure inside the valve body that can mimic electronic problems—and explains why many trucks are misdiagnosed before the real cause is found.
LZ0 Pickup Truck Calibration Releases (Feb 6, 2026)
GM Bulletin #26-NA-052 applies to 2026 Silverado and Sierra 1500 trucks equipped with the 3.0L LZ0 Duramax diesel. The bulletin addresses multiple fuel system and aftertreatment–related DTCs, including forced engine shutdown and emissions efficiency faults, and resolves them through an Engine Control Module calibration update—no parts required.
LZ0 Gets Calibration Updates For 2025 SUV's - 3.0 Duramax Diesel
GM Bulletin 26-NA-033 explains ECM calibration updates for 2025 LZ0 Duramax SUVs addressing MIL warnings and multiple DTCs caused by software anomalies.
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