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6.6L Duramax Diesel Timeline

The Duramax diesel was introduced in 2001 at 300 horsepower and 520 lb-ft of torque and has since evolved to produce 445 horsepower and 910 lb-ft of torque. While certain generations of the Duramax represent little more than more aggressive engine calibrations, others can nearly be classified as clean-slate designs with significant revisions relying on entirely different, non-interchangeable components. Use the chart below to identify the factory power and torque ratings for your 6.6L Duramax diesel.

Duramax Horsepower & Torque Figures by Model Year

Model Year(s) Horsepower Torque RPO Code
2001 - 2002 300 hp @ 3,100 rpm 520 lb-ft @ 1,800 rpm LB7
2003 300 hp @ 3,100 rpm 520 lb-ft @ 1,800 rpm LB7
210 hp @ 2,750 rpm 520 lb-ft @ 1,600 rpm LRY [1]
2004 300 hp @ 3,100 rpm 520 lb-ft @ 1,800 rpm LB7
310 hp @ 3,000 rpm 605 lb-ft @ 1,600 rpm LLY, automatic
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LLY, manual
210 hp @ 2,750 rpm 520 lb-ft @ 1,600 rpm LRY [1]
2005 310 hp @ 3,000 rpm 605 lb-ft @ 1,600 rpm LLY, automatic
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LLY, manual
210 hp @ 2,750 rpm 520 lb-ft @ 1,600 rpm LRY [2]
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LRX [2]
2006 310 hp @ 3,000 rpm 605 lb-ft @ 1,600 rpm LLY, automatic
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LLY, manual
360 hp @ 3,200 rpm 650 lb-ft @ 1,600 rpm LBZ
250 hp @ 2,500 rpm 460 lb-ft @ 1,600 rpm LBZ, van only
310 hp @ 3,000 rpm 605 lb-ft @ 1,600 rpm LBZ, medium duty only
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LRX [2]
300 hp @ 3,000 rpm 605 lb-ft @ 1,600 rpm LPD [2]
2007 360 hp @ 3,200 rpm 650 lb-ft @ 1,600 rpm LBZ
250 hp @ 2,500 rpm 460 lb-ft @ 1,600 rpm LBZ, van only
365 hp @ 3,200 rpm 660 lb-ft @ 1,600 rpm LMM
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LRX [3]
330 hp @ 3,000 rpm 620 lb-ft @ 1,600 rpm LYE [3]
2008 - 2009 365 hp @ 3,200 rpm 660 lb-ft @ 1,600 rpm LMM
250 hp @ 3,200 rpm 460 lb-ft @ 1,600 LMM, van only
300 hp @ 3,000 rpm 520 lb-ft @ 1,600 rpm LRX [3]
330 hp @ 3,000 rpm 620 lb-ft @ 1,600 rpm LYE [3]
2010 365 hp @ 3,200 rpm 660 lb-ft @ 1,600 rpm LMM
250 hp @ 3,200 rpm 460 lb-ft @ 1,600 LMM, van only
2011 - 2012 397 hp @ 3,000 rpm 765 lb-ft @ 1,600 rpm LML
335 hp @ 3,100 rpm 685 lb-ft @ 1,600 rpm LGH [4]
260 hp @ 3,100 rpm 525 lb-ft @ 1,600 rpm LGH [5]
2012 - 2016 397 hp @ 3,000 rpm 765 lb-ft @ 1,600 rpm LML
260 hp @ 3,100 rpm 525 lb-ft @ 1,600 rpm LGH [5]
2017 - 2023 445 hp @ 2,800 rpm 910 lb-ft @ 1,600 rpm L5P
2024 470 hp @ 2,800 rpm 975 lb-ft @ 1,600 rpm L5P

[1] Power option, medium duty engine calibration for Kodiak/TopKick models only; based on LB7 engine platform.
[2] Power option, medium duty engine calibration for Kodiak/TopKick models only; based on LLY engine platform.
[3] Power option, medium duty engine calibration for Kodiak/TopKick models only; based on LMM engine platform.
[4] Electronically de-rated for chassis cab applications; based on LML engine platform.
[5] Electronically de-rated for Express/Savana van applications; based on LML engine platform.

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