News

When someone says “first mod” on a Duramax, the conversation usually goes to tuning. But there’s a bolt-on piece that works with or without a tune, costs less than most tuners, and improves how the...

What a Shift-On-The-Fly Switch Actually Does A shift-on-the-fly switch — SOTF, sometimes called a DSP5 switch on Duramax or a multi-position switch on Powerstroke — is a rotary knob mounted in your...

CCV Delete vs CCV Filter Replacement — They’re Not the Same Thing Before anyone can talk about whether a CCV delete is a good idea, you have to understand what the factory system actually is, becau...

What the Factory LBZ PCV System Is Doing to Your Engine The 2006-2007 LBZ Duramax is the last of the pre-DPF Duramax engines, and for a lot of owners that makes it the holy grail. No diesel particu...

What P2002 Actually Means P2002 — “Diesel Particulate Filter Efficiency Below Threshold” — is the ECM’s way of saying your DPF isn’t doing its job anymore. The computer compares readings from press...

What P0401 Actually Means P0401 is one of the most common check engine lights on diesel trucks with EGR systems. The code’s technical definition — “Exhaust Gas Recirculation Flow Insufficient Detec...

Why the LML EGR Cooler Is a Known Weak Point The LML Duramax (2011–2016) marked a major emissions overhaul for GM’s diesel platform. To meet tightening EPA standards, the LML got a ninth fuel injec...

The 6.0L’s Weakest Link The 6.0L Powerstroke EGR cooler is a heat exchanger that routes hot exhaust gas through a bundle of small tubes surrounded by engine coolant. In theory, it cools the recircu...

For heavy-duty truck owners running the 2007.5-2010 GM 2500 or 3500 HD, the 6.6L LMM Duramax holds a significant place in diesel history. It delivered a crisp 365 horsepower and established incredi...