How to Read a VIN: What Each of the 17 Characters Means

A Vehicle Identification Number looks like a random string of characters, but every position has a job. Once you know the pattern, a VIN tells you who built a vehicle, roughly what it is, its model year and where it was assembled. That makes decoding one of the quickest ways to catch a listing that does not add up.

This guide walks through all 17 characters using the federal VIN standard, 49 CFR Part 565, which sets the format manufacturers must follow for vehicles sold in the United States.

The basic structure of a VIN

Federal rules require every VIN to have exactly 17 characters, with a check digit in position 9 (49 CFR 565.13). The characters are grouped into sections, and each section answers a different question.

Characters 1 to 3: World Manufacturer Identifier

The first three characters identify the manufacturer and the type of vehicle. Under Part 565, NHTSA has contracted with SAE International to coordinate the assignment of manufacturer identifiers, so the same code is not handed to two different companies.

The first character generally points to the country or region where the vehicle was manufactured. Vehicles built in the United States commonly start with 1, 4 or 5, Canadian-built vehicles with 2 and Mexican-built vehicles with 3. Japan often uses J, South Korea K and Germany W. This reflects where the vehicle was made, not the brand's home country.

Small manufacturers are a special case. A company that builds fewer than 1,000 vehicles of a given type per year is treated as a low-volume manufacturer and places a 9 in the third position. In that case, characters 12 to 14 complete the manufacturer identifier, as described in 49 CFR 565.15.

Characters 4 to 8: Vehicle Descriptor Section

The next five characters describe the vehicle itself, and what they must encode depends on the vehicle type. For passenger cars, the regulation calls for line, series, body type, engine type and restraint system type. For trucks, it includes items such as cab type, brake system and gross vehicle weight rating. For motorcycles, it covers the type of motorcycle, line, engine type and net brake horsepower.

Each manufacturer decides which character means what, then submits its decoding information to NHTSA. That is why these positions cannot be read with one universal chart. The practical way to decode them is the NHTSA vPIC VIN decoder, which draws on the information manufacturers provide.

Character 9: the check digit

Position 9 is not an arbitrary character. It is calculated from the other 16 characters using a formula published in the regulation. Each letter is converted to a number, each position is multiplied by a fixed weight, the results are added together and the total is divided by 11. The remainder becomes the check digit, and a remainder of 10 is written as the letter X.

For a buyer, this is a quick integrity test. If one character is mistyped, the math usually fails and many decoders will flag the VIN as invalid. That does not prove fraud, since typos are common, but it is a signal to read the number on the vehicle yourself.

Character 10: model year

The tenth character encodes the model year, which is the year the manufacturer assigns to the model and can differ from the calendar year the vehicle was built. The codes repeat on a 30-year cycle:

• A = 1980 or 2010, B = 1981 or 2011, C = 1982 or 2012, D = 1983 or 2013, E = 1984 or 2014
• F = 1985 or 2015, G = 1986 or 2016, H = 1987 or 2017, J = 1988 or 2018, K = 1989 or 2019
• L = 1990 or 2020, M = 1991 or 2021, N = 1992 or 2022, P = 1993 or 2023, R = 1994 or 2024
• S = 1995 or 2025, T = 1996 or 2026, V = 1997 or 2027, W = 1998 or 2028, X = 1999 or 2029
• Y = 2000 or 2030, and the digits 1 to 9 = 2001 to 2009 or 2031 to 2039

The letters I, O, Q, U and Z and the digit 0 are not used as year codes. To tell which cycle applies on a car, SUV or light truck, look at position 7. According to the note to the year table in Part 565, a number in position 7 means the year falls between 1980 and 2009, and a letter means it falls between 2010 and 2039.

Character 11: plant of manufacture

Position 11 identifies the plant where the manufacturer affixed the VIN. Plant codes are set by each manufacturer, so a decoder is the easiest way to read them. Recall campaigns are sometimes limited to vehicles from specific plants or production periods.

Characters 12 to 17: production sequence

The last six characters are the serial number the manufacturer assigned in production. For cars, multipurpose vehicles and trucks rated at 10,000 pounds or less, the last five characters must be numeric. For low-volume manufacturers, positions 12 to 14 belong to the manufacturer identifier and only positions 15 to 17 form the sequence number.

Part 565 also states that no two vehicles manufactured within a 60-year period beginning with the 1980 model year may share a VIN. That uniqueness is what allows title records, insurance claims and recall campaigns to be tied to one specific vehicle.

A worked example

Take the sample VIN shown in the placeholder of our lookup form: 1HGCM82633A004352.

• 1HG (positions 1 to 3): the WMI. The leading 1 points to a vehicle built in the United States, and 1HG is a Honda identifier.
• CM826 (positions 4 to 8): the descriptor section, which the manufacturer's decoding data translates into model, body and engine details.
• 3 (position 9): the check digit. Running the Part 565 formula on the other 16 characters leaves a remainder of 3, so the VIN passes.
• 3 (position 10): the model year. Position 7 is the number 2, so the 1980 to 2009 cycle applies and 3 means 2003.
• A (position 11): the plant code.
• 004352 (positions 12 to 17): the production sequence number.

If a seller advertised this VIN as a 2008 model, you would know something was wrong.

Characters that never appear in a VIN

The regulation limits VIN characters to the digits 0 to 9 and the letters A to Z except I, O and Q, which are easy to confuse with 1 and 0. If you see one of them in a listing, it is almost certainly a typo or a fabricated number. Very old vehicles built before the 17-character format can have shorter numbers that standard decoders may not read.

What decoding can and cannot tell you

Decoding confirms what a vehicle is supposed to be, not what has happened to it. A valid VIN can still belong to a car with a salvage history, a rolled-back odometer or an unrepaired safety recall. For that, you need history records, a recall check at NHTSA.gov/recalls and a physical inspection.