Semi truck VIN decoder

What a semi truck VIN tells you

Every truck built for the US market since 1981 has a 17-character vehicle identification number. It isn't random. Each part of it encodes something about the truck: who built it, what kind of vehicle it is, its model year, the plant where it was assembled and a serial number. A VIN decoder reads those parts and looks up the details the manufacturer reported for that pattern.

This semi truck VIN decoder uses the National Highway Traffic Safety Administration's free vPIC database, which manufacturers report to. It works for Freightliner, International, Peterbilt, Kenworth, Volvo, Mack, Western Star and other makes, as well as box trucks, pickups used for hotshot and trailers. It shows specs only. It never shows owners, accidents, liens or title history.

How the decoder works

First, the tool checks the VIN in your browser. It must be 17 characters, it can't contain the letters I, O or Q, which are left out so they aren't mistaken for 1 and 0, and the 9th character must match a check digit worked out from the other 16. Each letter is converted to a number, each position gets a weight, and the total divided by 11 leaves a remainder that should equal the 9th character, with 10 written as X. If it doesn't match, one character is almost certainly mistyped, and the tool tells you before calling NHTSA.

If the VIN passes, the tool asks NHTSA's vPIC service to decode it and shows the fields it returns: year, make, model, series, body type, gross vehicle weight rating class, engine maker and model, displacement, fuel type, drive type and where it was built. Fields NHTSA doesn't have for that VIN are left out.

• EXAMPLE

  EXAMPLE CHECK

  Reading a VIN by position

  Characters 1 to 3 identify the manufacturer. Characters 4 to 8 describe the vehicle, such as model, body and engine. Character 9 is the check digit. Character 10 is the model year code. Character 11 is the plant. Characters 12 to 17 are the serial number. A single mistyped character usually breaks the check digit.

Freightliner, International and other makes

People often search for a Freightliner VIN decoder or an International truck VIN decoder, expecting each make to need its own tool. They don't. The VIN standard is the same for every manufacturer, and NHTSA's database covers all makes sold in the US, so one decoder handles them all. What differs is how much detail each manufacturer reports. Some report engine model and GVWR class for every VIN, and some report less.

For build details NHTSA doesn't carry, like axle ratios, transmission, fuel tank size or optional equipment, ask the dealer for the build sheet for your VIN. Most heavy truck makers can provide it.

Why the GVWR class matters

The gross vehicle weight rating class tells you the weight range the truck is rated for. Class 8 covers trucks rated over 33,000 lb, which includes most semi tractors. Class 6 and 7 cover many box trucks. The rating matters for licensing: a single vehicle rated 26,001 lb or more needs a commercial driver's license. For a box truck, check the exact rating on the door sticker, since a class range alone won't tell you which side of that line you're on.

If you're buying a used truck, compare the decoded year, make, model and engine with the listing. A mismatch is a reason to ask questions before you pay. For box truck buyers planning a business, the box truck business profit calculator helps you check the numbers before you buy.

Put the truck to work

Once you know the truck, the next question is keeping it loaded. Our dispatchers find loads that fit your equipment, check each broker, counter above your floor and plan the reload before you deliver. Every load still needs your yes, and the broker sends the rate con to you. See how we work with owner-operators, or read about backhaul trucking and full truckload services.

For fuel planning, the semi truck fill-up cost calculator works out the gallons and cost from your tank size and gauge.