GM VIN CHECK DIGIT VERIFICATION
To determine check digit (9th digit) of your GM car, assign numeric values to any letters found in the VIN Code, according to the following table:
| A = 1
|
B = 2
|
C = 3
|
D = 4
|
E = 5
|
F = 6
|
G = 7
|
H = 8
|
| J = 1
|
K = 2
|
L = 3
|
M = 4
|
N = 5
|
O = 6
|
P = 7
|
R = 9
|
| S = 2
|
T = 3
|
U = 4
|
V = 5
|
W = 6
|
X = 7
|
Y = 8
|
Z = 9
|
Any numbers in the VIN retain their original value (not replaced). This yields a
17 digit number.
Then you multiply each of the 17 digits by a set "multiplier". The multiplier associated with each digit is found in this table:
| 1st
|
2nd
|
3rd
|
4th
|
5th
|
6th
|
7th
|
8th
|
Check
|
| 8
|
7
|
6
|
5
|
4
|
3
|
2
|
10
|
0
|
|
| 10th
|
11th
|
12th
|
13th
|
14th
|
15th
|
16th
|
17th
|
|
| 9
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
|
After multiplying each VIN digit by the associated weight - sum each of the 17 products. Divide this total by 11. The remainder is the check digit. (modulus 11) If the remainder is 10, then the check digit is 'X'.
Here's an example: VIN = 1 G 1 B L 5 2 P 7 T R 1 1 5 5 2 0 (note '7' is the check digit)
| VIN Code
|
1
|
G
|
1
|
B
|
L
|
5
|
2
|
P
|
7
|
T
|
R
|
1
|
1
|
5
|
5
|
2
|
0
|
| Assigned Value
|
1
|
7
|
1
|
2
|
3
|
5
|
2
|
7
|
7
|
3
|
9
|
1
|
1
|
5
|
5
|
2
|
0
|
| Multiplier
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
10
|
0
|
9
|
8
|
7
|
6
|
5
|
4
|
3
|
2
|
Add the
Products
|
(1 x 8) + (7 x 7) + (1 x 6) + ...... + (5 x 4) + (2 x 3) + (0 x 2) = 337
|
Divide 337 by 11 which gives you 30, and a remainder of 7 which is the same as
the 9th digit of the VIN.
