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GM Expands P2C7A Diagnostic Bulletin to Cover 2026 3.0 Duramax Trucks and SUVs
GM has updated bulletin #25-NA-299, expanding P2C7A diagnostic guidance to cover 2026 3.0L Duramax trucks and SUVs. The revision reinforces a critical point: this code is often caused by exhaust or induction leaks — not failed sensors or catalysts. Special attention should be given to front exhaust connections and the LM2 backpressure valve, with pressure testing and soap solution used to confirm leaks before replacing parts.
3.0 Duramax Lack Of Power? GM Identifies Charge Air Hose Restriction
GM has released new service information addressing a 3.0 Duramax condition where the engine idles normally but hesitates, loses power, or stalls during acceleration. The cause points to an internal restriction in the charge air cooler hose — a component critical to proper boost and airflow on both LM2 and LZ0 engines.
GM Redesigns the 3.0 Duramax Engine Oil Pan (LM2) (LZ0)
GM has redesigned the 3.0 Duramax (LM2) (LZ0) engine oil pan, introducing a relocated drain plug, revised sump geometry, and a new oil pickup tube. The updated design improves oil drainage during service and refines internal oil control, while maintaining overall capacity. Here’s what changed, why it matters, and what owners need to know about compatibility before ordering parts.
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
GM Redesigns the 3.0 Duramax Engine Oil Pan (LM2) (LZ0)
GM has redesigned the 3.0 Duramax (LM2) (LZ0) engine oil pan, introducing a relocated drain plug, revised sump geometry, and a new oil pickup tube. The updated design improves oil drainage during service and refines internal oil control, while maintaining overall capacity. Here’s what changed, why it matters, and what owners need to know about compatibility before ordering parts.
LEGAL TO DELETE? NO. But, EPA Rescinds the 2009 Endangerment Finding: What It Actually Means for 3.0 Duramax Owners
The EPA has rescinded the 2009 Endangerment Finding, but what does that actually mean for diesel owners? Here’s a clear breakdown of how the change affects greenhouse gases, the Clean Air Act, and 3.0 Duramax emissions systems.
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.
Other Diesel News
LEGAL TO DELETE? NO. But, EPA Rescinds the 2009 Endangerment Finding: What It Actually Means for 3.0 Duramax Owners
The EPA has rescinded the 2009 Endangerment Finding, but what does that actually mean for diesel owners? Here’s a clear breakdown of how the change affects greenhouse gases, the Clean Air Act, and 3.0 Duramax emissions systems.
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 -
GM Expands P2C7A Diagnostic Bulletin to Cover 2026 3.0 Duramax Trucks and SUVs
GM has updated bulletin #25-NA-299, expanding P2C7A diagnostic guidance to cover 2026 3.0L Duramax trucks and SUVs. The revision reinforces a critical point: this code is often caused by exhaust or induction leaks — not failed sensors or catalysts. Special attention should be given to front exhaust connections and the LM2 backpressure valve, with pressure testing and soap solution used to confirm leaks before replacing parts.
3.0 Duramax Lack Of Power? GM Identifies Charge Air Hose Restriction
GM has released new service information addressing a 3.0 Duramax condition where the engine idles normally but hesitates, loses power, or stalls during acceleration. The cause points to an internal restriction in the charge air cooler hose — a component critical to proper boost and airflow on both LM2 and LZ0 engines.
GM Redesigns the 3.0 Duramax Engine Oil Pan (LM2) (LZ0)
GM has redesigned the 3.0 Duramax (LM2) (LZ0) engine oil pan, introducing a relocated drain plug, revised sump geometry, and a new oil pickup tube. The updated design improves oil drainage during service and refines internal oil control, while maintaining overall capacity. Here’s what changed, why it matters, and what owners need to know about compatibility before ordering parts.
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