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Duramax Engine Identification

Duramax Engine Version by VIN

 

 

For some model years, it may be difficult to tell which Duramax your truck is equipped with. Often times, the new version of the Duramax was released in the middle of or at the end of a model year, so the year of your truck alone does not tell you which version you have. Use the table below to identify which Duramax engine your truck has based on the 8th digit of the vehicle identification number (VIN). This is the truck's VIN number, not the engine's identification/serial number. The VIN number can always be found on your vehicle's title or registration card. It is important to know which engine you have since not all components are interchangeable between the various versions of Duramax engines.

 

 

Duramax VIN Chart

Model Year(s)

8th Digit of VIN

Duramax Model & Notes

2001 - 2004

1

LB7

2

LLY (introduced midyear 2004)

2005

2

LLY (only engine offered for 2005)

2006

2

LLY (2006 version, different from 2005 version)

D

LBZ (introduced late 2006)

2007

D

LBZ

6

LMM

2008 - 2010

6

LMM (only Duramax offered during these years)

2011 - Current

8

LML

L

LGH (chassis cab/box delete only, RPO ZW9)