Remanufactured Duramax LML 6.6L Engine For Sale
2011–2016 — 397 hp @ 3,000 RPM | 765 lb-ft @ 1,600 RPM
The Duramax LML brought a massive power increase to 397 hp and 765 lb-ft of torque, along with the addition of SCR (Selective Catalytic Reduction) requiring DEF. The LML also introduced the Bosch CP4....
Starting from $7,000 – $9,500 — 1-Year Unlimited Mileage Warranty
Duramax LML Technical Specifications
About the Duramax LML Engine
The Duramax LML brought a massive power increase to 397 hp and 765 lb-ft of torque, along with the addition of SCR (Selective Catalytic Reduction) requiring DEF. The LML also introduced the Bosch CP4.2 fuel pump, replacing the CP3. The LML was a significant step forward in power and refinement, making it an excellent towing engine, though the added emissions equipment increased complexity.
Duramax LML Strengths
- Major power increase — 397 hp and 765 lb-ft of torque
- SCR system with DEF reduces NOx emissions effectively
- Quieter and more refined than earlier generations
- Excellent towing capability with strong mid-range torque
- Improved NVH (noise, vibration, harshness) characteristics
Common Duramax LML Issues (Addressed in Our Remanufactured Engines)
- CP4.2 fuel pump can fail catastrophically, sending metal debris through the fuel system
- DEF system components (heater, injector, sensor) can fail
- DPF and SCR require periodic maintenance
- NOx sensor failures are common
Vehicles with the Duramax LML
Available Duramax LML Remanufactured Engines
Duramax LML Buying Guide
The biggest concern with the LML is the CP4.2 fuel pump, which can fail and contaminate the entire fuel system with metal debris. When purchasing a remanufactured LML, verify that the fuel system has been thoroughly cleaned or replaced. Some owners install CP3 conversion kits for added reliability. The LML is identified by VIN code '8' in the 8th position. Always use high-quality fuel and change the fuel filter regularly.
Frequently Asked Questions — Duramax LML
How much does a remanufactured Duramax LML engine cost?
A remanufactured Duramax LML 6.6L engine typically costs between $7,000 and $9,500. The LML is a popular choice due to its strong 397 hp and 765 lb-ft output. All our LML engines include inspected fuel systems and a comprehensive warranty. Call (631) 991-7700 for a quote.
Is the Duramax LML a good engine?
Yes, the Duramax LML is an excellent engine with strong power output and good fuel economy. The main concern is the CP4.2 fuel pump reliability. With proper fuel quality and regular filter changes, the LML is a very capable and refined diesel engine that excels at towing.
What years is the Duramax LML?
The Duramax LML was installed in 2011 through 2016 Chevrolet Silverado 2500HD/3500HD and GMC Sierra 2500HD/3500HD trucks.
Does the Duramax LML require DEF?
Yes, the LML was the first Duramax generation to require DEF (Diesel Exhaust Fluid). It uses an SCR (Selective Catalytic Reduction) system in addition to the DPF. DEF consumption is typically 2-3% of fuel consumption.
Duramax Troubleshooting Guides
Duramax Problems Guide
LB7 injectors, LBZ head gaskets, LML DEF issues — all generations covered.
Read Guide →Diesel Engine Cost Guide
Complete pricing for remanufactured Duramax engines by generation.
Read Guide →Reman vs Rebuilt Engines
Which option is right for your Duramax? Compare quality, cost, and warranty.
Read Guide →Installation Guide
Step-by-step guide for installing your remanufactured engine.
Read Guide →