GM Service Manual Online
For 1990-2009 cars only

All engines and transmissions are stamped or laser etched with a partial vehicle identification number (VIN), which was derived from the complete VIN. A VIN derivative contains the following nine positions:

Position

Definition

Character

Description

1

GM Division Identifier

1

2

Chevrolet

Pontiac

2

Model Year

1

2001

3

Assembly Plant

M

7

8

S

Lansing, MI

Lordstown, OH

Lansing, MI

Ramos Arizpe, MEX

4-9

Plant Sequence Number

--

--

A VIN derivative can be used to determine if a vehicle contains the original engine or transmission, by matching the VIN derivative positions to their accompanying positions in the complete VIN:

VIN Derivative Position

Equivalent VIN Position

1

3

2

10

3

11

4-9

12-17