The following example VIN Number
may be used to illustrate how to calculate a check digit for the 17 digit VIN
code: 1M8GDM9A?KP042788, where the question mark
represents the unknown check sum 'value'.
Step 1: Transliteration consists of removing all of the letters from a Vehicle Identification Number and substituting them with their appropriate numerical counterparts. These numerical values can be found in the Table below. I, O and Q are must be excluded, and can not exist in a valid VIN; for the purpose of this example, they have been filled in with N/A (Not Applicable). Numerical digits use their own values. 



Step 2: The following is the weight factor for each position in the VIN. The 9th position is that of the VIN Check digit. It has been substituted with a 0, which will cancel it out in the multiplication step. 



Step 3:  The following table shows how the products (products = Value x Weight) of a VIN may be evaluated. 



The products (8, 28, 48, 35, 16, 12,18,10, 0 ,18 ,56 ,0 ,24,10, 28, 24,16) are all added together to obtain a Sum of 351 Check digit = Sum Mod 11 If the check digit value is 10 then this goes back into the VIN Number as a character X. Check Digit Calculator 
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