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Originally Posted by TimMullen
One other point about the "X" for the Check Digit. It's quite possible that the value of the check digit is "X". The check digit uses a Modulus 11 function, which results in a remainder of 0-10 which is used as the check digit. If the check digit is 10, it is replaced with an "X" - it's all part of the algorithm ...
One other point - the VIN encodes the model year as a character. It's currently the same as the last digit of the year, which will work until 2009. 2010 will be encoded as an "A", 2011 as "B", etc. They won't have to reuse the model years character "5" for another 30+ years...
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Good points. It's interesting that they use modulo 11 and not 10.
You can't use the letters I, O, or Q anywhere in a VIN, and for the 10th digit (model year) it looks like they might decide to leave off three more letters, or maybe two letters and zero, (they left off U and Z in the last decade), so that the next year that 5 will be used would be, yup, 2035!