VIN characters 4 through 8 are the vehicle descriptor section, or VDS. Federal rule 49 CFR 565.15(b) says those five characters must identify the vehicle's attributes; for a passenger car that means make, line, series, body type, engine type and every restraint device and where it sits. The rule does not say which letter means what. Each manufacturer writes its own code and files the key with NHTSA, so you read the VDS through a decoder such as NHTSA's free vPIC, not from a universal chart. On 2010 and later cars and light trucks, the 7th character has to be a letter.
I pulled the current rule text from eCFR and ran the decodes below through vPIC on Saturday afternoon, October 17, 2026. This is the middle of the VIN that most guides rush past, and it is the part that tells you whether the car in front of you is the car in the ad.
What the regulation actually requires
Section 565.15(b) defines the second section of the VIN as the five characters in positions 4 to 8, and points to a table of what they must make decipherable by vehicle type. Passenger cars get the list above. Multipurpose vehicles, the category most SUVs fall into, add gross vehicle weight rating. Trucks swap in model or line, chassis, cab type, brake system and GVWR, and motorcycles encode type, line, engine and net brake horsepower. The rule then says the characters used and their placement "may be determined by the manufacturer," as long as the attributes can be worked out from the information the maker supplies under section 565.16(c).
The one fixed character is position 7. For passenger cars and for trucks and multipurpose vehicles at or under 10,000 pounds GVWR, it must be alphabetic. That letter does double duty: per the model year table in the same section, a numeric 7th character means the 10th digit points to 1980 through 2009, and a letter means 2010 through 2039. Our 10th digit model year guide covers the year codes.
One Accord, four different descriptors
The clearest way to see the VDS work is to hold everything else still. The public example VIN 1HGCM82633A004352 came back from vPIC as "decoded clean," check digit correct: a 2003 Honda Accord EX-V6 coupe, two doors, 3.0-liter V6 (engine code J30A4), automatic. Its VDS is CM826.
vPIC also accepts an asterisk for an unknown character, so I kept the 1HG maker code, the 3 year code and the A plant code, put a wildcard in the check digit slot, and changed only the VDS. CM566 decoded as an Accord LX sedan with the 2.4-liter four-cylinder (K24A4) and an automatic. CM556 came back as an EX sedan, same four-cylinder, manual transmission. CM665 was an EX-V6 sedan. So in this Honda generation the CM stays the same and the last three characters carry body, engine, trim and even transmission. That pattern is my reading of four decodes rather than a published Honda chart, and it will not carry over to other brands.
Look at GM for contrast. 1G1ZT53826F109149 decoded clean as a 2006 Chevrolet Malibu LT sedan with a 3.5-liter V6 (LX9), VDS ZT538. And NHTSA's own API documentation uses the partial VIN 5UXWX7C5*BA as an example; with model year 2011 it decodes to a BMW X3 xDrive35i, an all-wheel-drive SUV with a 3.0-liter six. Its 7th character is C, a letter, as the rule requires after 2009. Three makers, three layouts.
Why the VDS matters when you buy
The VDS is your best quick check on trim and engine claims. If a listing says V6 and the decode says four-cylinder, either the ad is wrong or the VIN is not from that car. Either way, slow down. It matters for parts too, because one model year can carry several engines, which is why parts counters ask for the VIN.
Recall scope is often written in VDS terms too. NHTSA's recall data for the 2003 Accord includes campaign 17V220000, which covers certain 2003 Accord coupes "equipped with a four-cylinder engine" whose passenger air bag module may have been replaced with a Takata inflator, and 12V222000, which covers 2003 to 2007 Accord V6 models for a power steering hose that can leak onto the catalytic converter. Body style and engine both sit in the VDS. Still, the campaign text is a summary, so let the official VIN recall lookup confirm if your car is included.
Where a VDS check catches a fake
A cloned VIN is usually copied from a car of the same model, so the VDS often matches at a glance. The tell is in the details: an engine, body style or airbag layout that does not match what the decoder says. Our VIN cloning guide covers the dash and door-jamb checks. Pair the VDS with the check digit in position 9, which catches typos, and the WMI in positions 1 to 3, which tells you whose code book to read.
Two limits are worth knowing. The Honda, Chevy and BMW decodes all left the Series field blank, so vPIC is only as detailed as what the maker filed. And a decoder cannot tell you a car's history. Our 11th digit plant code post covers another place a mismatched VIN shows up.
Reading your own VIN
Copy the VIN from the dash and the door-jamb label, make sure they match, and run it through vPIC. Compare Model, Trim, BodyClass, the engine fields and the air bag locations with the car and the ad. Then check title brands on NMVTIS and get a history report. CarVins is a licensed CARFAX and AutoCheck reseller, not affiliated with CARFAX, AutoCheck or Experian. Single reports through us were about $5.50 for guests and $4.50 for members this week, about $6.75 for both brands, versus roughly $39.99 to $44.99 retail; the checkout page has the current number.
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