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"