How does VIN position 10 encode the year?

Position 10 cycles through a fixed sequence of letters and digits, one per model year. It started with A for 1980, runs through Y for 2000, then uses digits 1 to 9 for 2001 to 2009, and restarts at A for 2010, repeating every 30 years.

Which letters are skipped?

The model year code never uses I, O, Q, U, Z, or the digit 0, because they are confused with other characters. So the letter sequence runs A B C D E F G H J K L M N P R S T V W X Y, then digits 1 through 9.

Why are there two possible years?

The cycle repeats every 30 years, so the same character means, for example, both 1989 and 2019. A single character cannot tell them apart, which is why the tool shows both candidates and tries to narrow it down.

How does position 7 break the tie?

Since the 2010 model year, manufacturers were required to make position 7 a letter for vehicles 2010 and newer, and a number for 1980 to 2009. The tool reads position 7 from a full VIN to choose the correct 30-year cycle when possible.

Does the model year match the calendar year?

Not exactly. A model year vehicle is often built and sold starting the autumn before its model year, so a car built in late 2023 can carry a 2024 model year. Position 10 encodes the model year, not the manufacture date.

VIN Model Year Decoder

Position 10 of a VIN is the model year, but the code repeats every 30 years, so a single character is ambiguous on its own. This decoder maps the character to its year using the exact NHTSA sequence, shows both candidates, and uses position 7 to pick the right one whenever a full VIN is supplied.

How it works

The model-year characters follow a fixed cycle that skips confusable symbols, and the 30-year repeat is resolved with position 7:

1980 A, 1981 B … 2000 Y, 2001 1 … 2009 9, 2010 A …  (repeats every 30 yr)
skipped: I O Q U Z and 0
candidate years = all years 1980–2040 mapping to that character
disambiguate: position 7 is a LETTER ⇒ 2010+ cycle, a DIGIT ⇒ 1980–2009

If only the single character is given, both candidate years are shown; with a full VIN the position-7 rule usually pins it to one.

Example and tips

The character A at position 10 means 1980, 2010, or 2040. Paste a full VIN and if position 7 is a letter the tool resolves it to 2010; if position 7 is a digit it resolves to 1980. The letter Y is always 2000 (or 2030), and the digits 1 through 9 are 2001 through 2009. Remember the model year often leads the calendar year, so an autumn build can already carry next year’s code.