Duramax L5P >Cummins 6.7L< LBZ
Guides for Duramax diesel owners.
LBZ Duramax: Why Mechanics Call It the Best Duramax Ever Made
The 2006 and early 2007 LBZ Duramax is the engine GM owners chase. Fourteen years in the shop taught me exactly why it earned that name, and what to check before you buy one.
Best Used Diesel Trucks to Buy in Canada Right Now
Shopping for a used diesel truck in Canada? A Red Seal mechanic ranks the five used diesels worth your money right now, what to pay, and the rust and emissions traps that catch buyers.
Allison 10 Speed Reliability: The Honest Report
The 10 speed behind the 2020 and newer Duramax wears the Allison badge, but GM builds it. Recalls, valve body failures, and fourteen years of shop experience tell the real reliability story.
DPF Replacement Cost in the USA: What Dealers Charge
DPF replacement on a US diesel pickup runs $2,500 to $5,500 installed at a dealer. See part prices by engine, cleaning costs, and what to check before you pay.
CP4 vs CP3: Which Pump Your Truck Has and Why It Matters
CP4 vs CP3: find out which fuel pump your Duramax, Powerstroke, or Cummins has, test it with a scan tool, and weigh conversion cost against a failure repair.
What Kills a CP4 Pump? Causes, Cost, and How to Protect It
A failing CP4 pump fills your whole fuel system with metal. Learn what kills a CP4 pump, what the expensive repair costs, and the habits that protect yours.
P0087 Code on Duramax: Low Fuel Rail Pressure, Fixed
P0087 means your Duramax is starving for fuel. Here is how to diagnose it properly instead of throwing parts at it.
How to Clean a DPF Filter (Regeneration Guide for Diesel Trucks)
Your truck is asking for a DPF regen and you are not sure what to do. Here is what actually works, from a mechanic who has done hundreds of them.
Duramax L5P Problems — What Owners Actually Deal With
The L5P Duramax is GM's best diesel yet, but it has its quirks. A mechanic breaks down the real failure points.