Engine Identification - Hummer 2003 H2 Owner's Manual

Vehicle Identification Number (VIN)
This is the legal identifier for your vehicle. It appears
on a plate in the front corner of the instrument panel,
on the driver's side. You can see it if you look through
the windshield from outside your vehicle. The VIN also
appears on the Vehicle Certification and Service Parts
labels and the certificates of title and registration.

Engine Identification

The 8th character in your VIN is the engine code.
This code will help you identify your engine,
specifications and replacement parts.
6-58
Service Parts Identification Label
You'll find this label located in the glove box. It's very
helpful if you ever need to order parts. On this label is:
D
your VIN,
D
the model designation,
D
paint information and
D
a list of all production options and special
equipment.
Be sure that this label is not removed from the vehicle.