Your VIN tells you exactly when your car was built, down to the week
The 10th character of your Vehicle Identification Number (VIN) is the model year code. The 11th and 12th characters together tell you the week of manufacture. Combined, these three digits reveal the precise week your car rolled off the assembly line—information that matters for warranty coverage, recall timing, and understanding how old major components actually are.
You'll find your VIN on the driver's side dashboard (visible through the windshield), on your registration documents, insurance card, and title. Once you have it, decoding the build date takes less than a minute.
Key Takeaways
- The 10th character of your VIN is a letter or number representing the model year; use a standard year code chart to convert it to the actual calendar year.
- The 11th and 12th characters are numbers that represent the week of manufacture within that model year, ranging from 01 to 53.
- Model year does not always match calendar year—a car built in September 2023 might carry a 2024 model year designation.
- Knowing your exact build week helps you determine whether your car is affected by recalls issued after manufacture and whether components are still under factory warranty.
Understanding the 10th Character: Model Year Code
The 10th position in your VIN uses a repeating letter and number system to identify the model year. The code cycles through letters A through Y (skipping I and O to avoid confusion with numbers 1 and 0), then repeats. A represents 2010, B represents 2011, and so on. The cycle resets: Y represents 2030, then the pattern starts over with A for 2031.
To find your car's model year, locate the 10th character and match it to the year code. If your 10th character is H, your car is a 2017 model year. If it's T, your car is a 2029 model year. This is the official model year assigned by the manufacturer, which may differ from when the car was actually built.
Keep in mind that manufacturers often build vehicles several months before the official model year begins. A car built in August 2023 might carry a 2024 model year code (the 10th character would be E). This is normal and does not mean the build date is wrong.
Reading the 11th and 12th Characters: Week of Manufacture
The 11th and 12th characters form a two-digit number representing the week of the model year in which your car was built. Week 01 is the first week of production for that model year, and week 53 represents the final week (some years have 52 weeks). These numbers run consecutively from 01 through 52 or 53, depending on the manufacturer's production schedule.
For example, if your 11th and 12th characters read "15," your car was built during the 15th week of its model year. Combined with the 10th character, you now know both the model year and the specific week of manufacture.
Not all manufacturers use the same week-numbering system. Some begin their model year in September, others in October. This means week 01 for one brand might fall in September, while another brand's week 01 might fall in October. The actual calendar date depends on the manufacturer's production calendar, which you can find in the owner's manual or by contacting the manufacturer directly.
How to Locate Your VIN and Extract the Build Date
Your VIN is a 17-character code that appears in several places on your vehicle and documents. The easiest location is the lower left corner of your windshield on the driver's side—you can read it without opening the car. You'll also find it printed on your vehicle registration, insurance card, title document, and service records.
Once you have the VIN in front of you, count to the 10th character and write it down. Then write down the 11th and 12th characters. These three characters are all you need to determine the build date. Count the positions carefully: position 1 is the first character, position 10 is the 10th character from the left.
If you're reading the VIN from your windshield, the characters may be slightly difficult to see depending on glare and lighting. Taking a photo with your phone and zooming in can make the characters clearer. Alternatively, your registration or insurance documents will have the full VIN printed clearly.
Why Build Date Matters for Recalls and Warranty
Recalls are issued by manufacturers and regulators after a vehicle is already in use. A recall issued in 2024 may only affect cars built between certain weeks in 2022 and 2023. If your car was built before or after that window, it may not be affected even though it carries the same model year and VIN pattern as a recalled vehicle.
Knowing your exact build week lets you check whether a specific recall applies to your car. When you look up a recall using your VIN, the system cross-references your build date to determine whether your car is in the affected production run. This is why providing your full VIN—not just the model year—is essential for accurate recall information.
Warranty coverage also depends on build date in some cases. Factory warranties typically run from the build date, not the purchase date. A car built in January 2023 but purchased used in January 2024 has already consumed one year of its warranty period, even though you just bought it. Understanding your build date helps you know how much factory coverage remains.
Decoding the Model Year Code Chart
The 10th character follows this repeating pattern. Each letter or number represents a specific year in a 30-year cycle:
| 10th Character | Model Year | 10th Character | Model Year |
|---|---|---|---|
| A | 2010, 2040 | N | 2023, 2053 |
| B | 2011, 2041 | P | 2024, 2054 |
| C | 2012, 2042 | R | 2025, 2055 |
| D | 2013, 2043 | S | 2026, 2056 |
| E | 2014, 2044 | T | 2027, 2057 |
| F | 2015, 2045 | V | 2028, 2058 |
| G | 2016, 2046 | W | 2029, 2059 |
| H | 2017, 2047 | X | 2030, 2060 |
| J | 2018, 2048 | Y | 2031, 2061 |
| K | 2019, 2049 | 1 | 2032, 2062 |
| L | 2020, 2050 | 2 | 2033, 2063 |
| M | 2021, 2051 | 3 | 2034, 2064 |
| N | 2022, 2052 | 4 | 2035, 2065 |
Notice that the letters I and O are skipped to prevent confusion with the numbers 1 and 0. The pattern then continues with numbers 1 through 9, then repeats. For vehicles built in 2010 or later, use the first year listed in the table above. For any vehicle you're looking at today, the 10th character will fall somewhere in the 2010–2031 range.
Converting Week Number to Approximate Calendar Date
Once you know the model year and week number, you can estimate the calendar month when your car was built. Week 01 typically falls in the first or second month of the model year, depending on when the manufacturer begins production. Week 26 falls roughly in the middle of the production year, and week 52 falls near the end.
Because different manufacturers start their model year at different times, the exact calendar date varies. Some manufacturers begin in September, making week 01 fall in September or October. Others begin in October, making week 01 fall in October or November. Your owner's manual or the manufacturer's website will specify when their model year begins.
As a rough estimate: divide the week number by 52 and multiply by 12 to get the approximate month offset from the start of the model year. Week 26 would be roughly 26÷52 × 12 = 6 months into the model year. If the model year starts in October, week 26 would fall around April of the following calendar year. This is an approximation; the exact date depends on the manufacturer's production schedule.
Frequently Asked Questions
Can I find the exact calendar date of manufacture, not just the week?
The VIN provides the week of manufacture, not the specific day. To find the exact date, contact the manufacturer's customer service with your VIN. They can tell you the precise build date, which may be listed in your service records or owner's manual as well. Some dealers can also look up the exact date in their system.
What if my car was built in a different year than the model year shown in the VIN?
This is normal. Manufacturers assign model years that often begin months before the calendar year changes. A car built in September 2023 may carry a 2024 model year code. The model year is a manufacturer designation, not the calendar year of manufacture. Your actual build date is determined by the 10th, 11th, and 12th characters together.
Does the build date affect how old my car really is?
Yes. A car's age for warranty and component lifespan purposes is measured from the build date, not the purchase date or model year. A 2020 model year car built in September 2019 is actually older than a 2020 model year car built in December 2019. This matters for warranty claims and understanding how much life remains in time-sensitive components like batteries and fluids.
How do I use the build date to check if a recall applies to my car?
When you look up your VIN on the National Highway Traffic Safety Administration (NHTSA) website or your manufacturer's recall page, the system automatically cross-references your build date. Recalls are often limited to specific production weeks. Providing your full VIN ensures the recall check accounts for your exact build date, not just your model year.
What if I can't read the 10th, 11th, or 12th character clearly?
Check your registration, insurance card, or title—these documents print the VIN clearly. You can also contact your car's manufacturer with your vehicle registration information, and they can provide the build date. Your dealer can also look up the build date in their system if you purchased the car from them.