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What Do GM Transmission Codes MQB, MQC, MHT, MHS, and MI2 Actually Mean?
If you've ever scanned your GM truck's build sheet and noticed transmission codes like MQB, MQC, MHT, MHS, or MI2, you may have wondered what they actually mean. While they're all part of GM's 10-speed transmission family, these RPO codes identify different calibrations, shifter configurations, and applications. Here's what each code means, which trucks use them, and why the 3.0L Duramax has its own dedicated transmission variants.
GM Issues New Emissions Recall for 2024 3.0L Duramax Trucks: PCV System Fault Detection Explained (N262556290)
General Motors has issued a new emissions recall for certain 2024 Chevrolet Silverado and GMC Sierra 1500 trucks equipped with the 3.0L Duramax diesel. The recall addresses an Engine Control Module software issue that may prevent the vehicle from detecting and reporting certain Positive Crankcase Ventilation (PCV) system faults.
LZ0 Thrust Bearing Failure: Did This Engine Teardown Finally Reveal the Cause?
A teardown of a failed 7,500-mile LZ0 Duramax engine uncovered evidence suggesting only one thrust bearing may have been present. While this is only a single engine, the findings could help explain the excessive crankshaft end play and engine failures being reported by owners. Here's what was discovered and why it matters.
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 Y181 Update Explained: Silverado & Sierra OTA Update 661.51 Arrives for Owners
GM has released OTA update 661.51 for Silverado and Sierra trucks. The Y181 software update includes HVAC fixes, TPMS improvements, key detection updates, pedestrian alert changes, improved starting reliability, reduced check engine light activation, turbo diagnostic improvements, and power running board reliability enhancements.
GM 3.0L Duramax LZ0 Engine: Complete Specifications, Design Features, and Technical Breakdown
The LZ0 Duramax is GM's second-generation 3.0L inline-six diesel engine, producing 305 horsepower and 495 lb-ft of torque. This complete guide covers specifications, steel pistons, cooling system updates, reliability improvements, and every major difference between the LZ0 and LM2 engines.
Why Rising Lubricant Prices Could Hit 3.0 Duramax Owners Harder Than Most
Rising synthetic oil prices and global base oil shortages could directly affect 3.0 Duramax owners. From higher DexosD oil costs and tighter supply to potential formulation changes, here’s what LM2 and LZ0 owners need to know — and why modern diesel engines are more dependent on oil quality than ever before.
Other Diesel News
GM Google Gemini Update Now Available: How to Upgrade Your Duramax Truck’s Assistant (Step-by-Step Guide)
Google Gemini — the smarter, more conversational AI — is now rolling out to 2022+ Duramax trucks and other GM vehicles with Google Built-in. In this guide we break down exactly why you’ll want the upgrade, plus the official step-by-step process from GM Service Bulletin #26-NA-127 to check your Android version, update Maps & Assistant, and activate Gemini in minutes.
Ready to ditch the old Google Assistant for a much more capable co-pilot? Full guide and how-to inside.
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 -
What Do GM Transmission Codes MQB, MQC, MHT, MHS, and MI2 Actually Mean?
If you've ever scanned your GM truck's build sheet and noticed transmission codes like MQB, MQC, MHT, MHS, or MI2, you may have wondered what they actually mean. While they're all part of GM's 10-speed transmission family, these RPO codes identify different calibrations, shifter configurations, and applications. Here's what each code means, which trucks use them, and why the 3.0L Duramax has its own dedicated transmission variants.
GM Issues New Emissions Recall for 2024 3.0L Duramax Trucks: PCV System Fault Detection Explained (N262556290)
General Motors has issued a new emissions recall for certain 2024 Chevrolet Silverado and GMC Sierra 1500 trucks equipped with the 3.0L Duramax diesel. The recall addresses an Engine Control Module software issue that may prevent the vehicle from detecting and reporting certain Positive Crankcase Ventilation (PCV) system faults.
LZ0 Thrust Bearing Failure: Did This Engine Teardown Finally Reveal the Cause?
A teardown of a failed 7,500-mile LZ0 Duramax engine uncovered evidence suggesting only one thrust bearing may have been present. While this is only a single engine, the findings could help explain the excessive crankshaft end play and engine failures being reported by owners. Here's what was discovered and why it matters.
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