Duramax VIN Engine Identification

Identifying Duramax Engine Version Using The VIN Number

 

 

The following tables will help you identify which Duramax diesel engine a truck has based on the 8th digit of the vehicle identification number (VIN).

 

2001 - 2004 VIN Number Engine Identification:

 

8th Digit of VIN Number	Duramax Diesel Engine
1	LB7
2	LLY (the LLY was introduced mid-year in 2004)

 

2005 VIN Number Engine Identification:

 

8th Digit of VIN Number	Duramax Diesel Engine
2	LLY

*The LLY was the only Duramax engine offered in 2005.

 

2006 VIN Number Engine Identification:

 

8th Digit of VIN Number	Duramax Diesel Engine
2	LLY 2006 version
D	LBZ (the LBZ was introduced late in 2006)

*the 2006 LLY features many differences from the 2005 version. View the 2006 LLY Differences for more information.

2007 VIN Number Engine Identification:

 

8th Digit of VIN Number	Duramax Diesel Engine
D	LBZ
6	LMM

 

2008 - PRESENT VIN Number Engine Identification:

The LMM is currently the only Duramax offered. The 8th digit is a "6"