VIN & Vehicle History Glossary: Key Terms Explained

Plain-English definitions of 54 U.S. VIN, title, and vehicle-history terms, from ACV and branded titles to title washing and VIN cloning.

By VIN Lookup Research DeskPublished 2026-08-27Reviewed 2026-08-27United States

Defined terms5 official sources reconciled

Read the notes and limitations before applying any single field to a title, purchase, or safety decision.

Direct answer

This glossary defines 54 U.S. VIN and vehicle-history terms in plain English — VIN structure fields such as WMI and check digit, title statuses such as salvage, rebuilt, and junk, fraud patterns such as title washing and VIN cloning, and the federal systems behind reports, including NMVTIS, NHTSA, and the FTC Buyers Guide. Definitions describe common U.S. usage; exact title-brand criteria vary by state, so the issuing jurisdiction's wording controls.

All terms, A to Z

These are consumer-oriented working definitions for reading U.S. vehicle listings, titles, and history reports. Where a term is defined by statute or varies by jurisdiction, the definition says so — the controlling language is always the statute or the issuing state's title record.

U.S. VIN and vehicle-history terms with plain-English definitions
Term	Definition
ACV (actual cash value)	ACV (actual cash value) is the amount an insurer determines a vehicle was worth immediately before a loss, calculated as replacement cost minus depreciation for age, mileage, and condition. U.S. insurers compare estimated repair costs against ACV, using state thresholds or formulas, to decide whether a damaged vehicle is a total loss.
As-is sale	An as-is sale is a used-vehicle transaction in which the buyer accepts the car with all existing faults and the seller disclaims implied warranties. In the United States, dealers must disclose as-is status on the FTC Buyers Guide, and some states restrict or prohibit as-is sales of used cars.
Bonded title	A bonded title is a vehicle title issued by a U.S. state after the applicant purchases a surety bond, used when ownership evidence is missing or defective. The bond protects prior owners and lienholders who later prove a claim; most states remove the bonded notation after several years without a challenge.
Branded title	A branded title is a vehicle title that carries a permanent state-assigned designation, such as salvage, rebuilt, flood, or lemon law buyback, flagging serious damage or history events. Title brands are defined by each state's law, so their names, definitions, and damage thresholds vary from state to state.
Build sheet	A build sheet is a manufacturer document listing the exact options, equipment, colors, and factory specifications a vehicle received during assembly, tied to its VIN. Collectors and used-car buyers use build sheets to verify originality, and many automakers or their heritage archives can supply one when given the vehicle identification number.
Buyers Guide (FTC)	The Buyers Guide is the window disclosure the FTC's Used Car Rule requires U.S. dealers to display on used vehicles, stating whether the car is sold as-is or with a warranty and which systems the warranty covers. It becomes part of the sales contract and overrides any contrary contract terms.
Certificate of destruction	A certificate of destruction is a document some U.S. states and insurers issue for vehicles damaged so severely they may never return to the road; the vehicle can only be dismantled for parts, scrapped, or exported. Unlike a salvage title, a certificate of destruction generally cannot be converted into a rebuilt title.
Check digit	The check digit is the ninth character of a 17-character VIN, computed from the other sixteen characters with a weighted algorithm defined in U.S. federal regulation 49 CFR 565. Decoders and registries use it to catch transcription errors and some forged VINs, since an altered VIN usually fails the check-digit calculation.
Clean title	A clean title is a vehicle title carrying no state-assigned brands such as salvage, rebuilt, flood, or lemon law buyback. A clean title does not guarantee a clean history: damage kept below insurance thresholds, unreported accidents, or title washing between states can leave a badly damaged vehicle with an unbranded title.
CPO (certified pre-owned)	A CPO (certified pre-owned) vehicle is a used vehicle that passed a manufacturer or dealer inspection and reconditioning program and is sold with an extended warranty. Manufacturer-backed CPO programs typically exclude branded-title vehicles, but certification standards, inspection checklists, and warranty terms vary by automaker and are not set by federal law.
Curbstoning	Curbstoning is the illegal practice of unlicensed dealers posing as private sellers to flip vehicles, often hiding damage, rolled-back odometers, or washed titles while evading dealer licensing laws and consumer protections. Most U.S. states cap the number of vehicles a person may sell per year without a dealer license.
Dismantler	A dismantler is a state-licensed business that takes apart end-of-life or salvage vehicles to sell usable parts and recycle the rest. Under U.S. federal law, dismantlers and junk yards must report vehicles they acquire to NMVTIS, which is how dismantled and scrapped records surface in vehicle history checks.
DPPA (Driver's Privacy Protection Act)	The DPPA (Driver's Privacy Protection Act) is a 1994 U.S. federal law restricting disclosure of personal information in state motor vehicle records, such as an owner's name and address, to a set of permitted uses. It is why VIN lookups return vehicle data but never the identities of current or past owners.
Duplicate title	A duplicate title is a replacement certificate of title a state DMV issues when the original is lost, stolen, or damaged; it is typically stamped 'duplicate' and voids the original. Because duplicates are sometimes used to hide liens or sell a vehicle twice, buyers should confirm the title's current status with the issuing state.
Export title	An export title, or export-only designation, is a status some U.S. states and salvage auctions place on vehicles that cannot be retitled or registered domestically and must leave the country. Salvage buyers should check sale documents carefully, because an export-only vehicle can never legally return to American roads.
Flood title	A flood title is a state title brand marking a vehicle damaged by water, usually after an insurer declared it a total loss from flooding. Branding criteria vary by state, from any water damage over a threshold to water reaching specific components, and flood cars are commonly moved across state lines to wash the brand.
Gray market vehicle	A gray market vehicle is a vehicle manufactured for sale outside the United States and imported without the manufacturer's authorization. To be registered by a U.S. state, a gray market vehicle must be brought into compliance with federal safety and emissions standards or qualify for an exemption, most commonly the 25-year rule.
Grey import	A grey import is a vehicle brought into a country through channels other than the manufacturer's official distribution network; in the United States the term is used interchangeably with gray market vehicle. Grey imports over 25 years old are exempt from Federal Motor Vehicle Safety Standards, which drives the popularity of imported JDM cars.
Junk title	A junk title is a state designation for a vehicle judged fit only for parts or scrap, generally barring it from ever being rebuilt, retitled, or registered for road use. Terminology varies by state, with some using 'junk' and others 'non-repairable' or 'certificate of destruction,' but the effect is permanently ending roadworthiness.
Lemon law buyback	A lemon law buyback is a vehicle a manufacturer repurchased from a consumer under a state lemon law because a substantial defect persisted after a reasonable number of repair attempts. Several states, including California, require the title to be branded and the history disclosed to later buyers; specifics differ by state.
Lien	A lien is a legal claim a lender or other creditor holds against a vehicle as security for a debt, most often an auto loan. The lien is recorded on the title, and the owner cannot transfer clear ownership until it is released; buying a car with an undisclosed lien risks repossession.
Lienholder	A lienholder is the bank, credit union, finance company, or individual holding a lien on a vehicle until the underlying debt is repaid. In title-holding states the lienholder keeps the physical title certificate during the loan; in all states it must release the lien before ownership can transfer cleanly.
MCO/MSO (manufacturer certificate of origin)	An MCO or MSO (manufacturer certificate of origin, also called a manufacturer statement of origin) is the document an automaker issues for a new vehicle before any state title exists. The selling dealer assigns it to the first buyer, and the state uses it to issue the vehicle's first certificate of title.
Model year code	The model year code is the tenth character of a 17-character VIN, identifying the vehicle's model year with a letter or digit sequence defined in 49 CFR 565. Because the sequence repeats every 30 years, with 'A' meaning 1980 or 2010, decoders read it together with other VIN positions to resolve the correct year.
Monroney Act (Automobile Information Disclosure Act)	The Monroney Act, formally the Automobile Information Disclosure Act of 1958, is the U.S. federal law requiring every new car to carry a window sticker listing MSRP, standard and optional equipment, and other disclosures. Named for Senator Mike Monroney, it makes removing or altering the sticker before delivery a federal offense.
Monroney sticker (window sticker)	A Monroney sticker, or window sticker, is the label federal law requires on every new car sold in the United States, showing MSRP, factory equipment, fuel economy, safety ratings, and final assembly location. VIN-matched reprints help used-car buyers verify which options and packages a vehicle originally left the factory with.
NHTSA (National Highway Traffic Safety Administration)	NHTSA (National Highway Traffic Safety Administration) is the U.S. federal agency within the Department of Transportation that sets vehicle safety standards, administers safety recalls, and standardized the 17-character VIN. Its free public tools let anyone decode a VIN through vPIC or check any vehicle for open recalls by VIN.
NICB (National Insurance Crime Bureau)	The NICB (National Insurance Crime Bureau) is a U.S. nonprofit funded by insurance companies to fight vehicle theft and insurance fraud. Its free VINCheck service tells consumers whether member insurers have reported a vehicle as stolen and unrecovered, or as a salvage or total-loss record, before they buy.
NMVTIS (National Motor Vehicle Title Information System)	NMVTIS (National Motor Vehicle Title Information System) is the U.S. Department of Justice database consolidating title, brand, salvage, and junk records reported by state titling agencies, insurers, junk yards, and dismantlers. Federal law makes this reporting mandatory, so NMVTIS serves as the national backstop against title washing across state lines.
Odometer brands	Odometer brands are the mileage-status designations recorded on a U.S. title or odometer disclosure: 'actual' means the reading is believed true, 'not actual' means it is known to be wrong, and 'exceeds mechanical limits' means a five- or six-digit odometer has rolled over. A non-actual brand permanently affects value.
Odometer disclosure statement	An odometer disclosure statement is the written mileage declaration federal law requires a seller to provide when transferring a vehicle's title, certifying the reading as actual, not actual, or exceeding mechanical limits. Under a 2021 federal rule, vehicles from model year 2011 onward require disclosure for 20 years instead of 10.
Odometer rollback	An odometer rollback is the illegal alteration of a vehicle's odometer to show fewer miles than it has actually traveled, a federal crime under 49 U.S.C. 32703. Digital odometers can be rewritten with inexpensive tools, so buyers should compare the displayed reading against mileage recorded in title, inspection, and service records.
Parts-only title	A parts-only title is a designation some U.S. states assign to vehicles that may be sold solely as a source of components and can never be rebuilt, retitled, or registered for road use. It works like a certificate of destruction, though the exact name and rules depend on the issuing state.
Quiet title	A quiet title action is a lawsuit asking a court to determine ownership of property, including a vehicle, and extinguish competing claims. Vehicle owners pursue it when missing paperwork prevents a state from issuing a title and no bonded title is available; the court's judgment can then compel the DMV to issue one.
Rebuilder	A rebuilder is a person or state-licensed business that repairs salvage vehicles and returns them to roadworthy condition for retitling as rebuilt. Most U.S. states require rebuilders to document the parts they used and pass a state inspection, typically aimed at detecting stolen parts, before a rebuilt title is issued.
Rebuilt title (reconstructed title)	A rebuilt title, called a reconstructed title in some states, is the brand a state assigns to a former salvage vehicle that has been repaired and passed the state's inspection for return to the road. The salvage history remains on record permanently, and rebuilt vehicles typically insure and resell below clean-title equivalents.
Recall	A recall is a determination by a manufacturer or NHTSA that a vehicle or item of equipment contains a safety defect or violates a federal safety standard. Manufacturers must notify owners and provide a free remedy for vehicles first sold within the previous 15 years, and open recalls can be checked by VIN.
Salvage auction	A salvage auction is a marketplace, such as Copart or IAA, where insurers sell total-loss vehicles to dismantlers, rebuilders, exporters, and, in some states, the public. Auction listings and photographs often document damage that later disappears from a cleaned-up vehicle, which makes auction history an important part of pre-purchase research.
Salvage title	A salvage title is a state-issued brand for a vehicle an insurer has declared a total loss, usually because repair costs exceeded a set percentage of its pre-loss value. Thresholds vary by state, roughly from 50 to 100 percent or a formula, and a salvage vehicle cannot legally be driven until rebuilt and inspected.
Title brand	A title brand is a permanent designation a state motor vehicle agency prints on a title to flag a significant event in the vehicle's history, such as salvage, rebuilt, flood, fire, hail, junk, or lemon law buyback. Brands are defined by each state's law, so the same damage can produce different brands, or none, depending on the state.
Title jumping	Title jumping is the illegal practice of buying a vehicle and reselling it without ever titling it in the buyer's own name, breaking the chain of ownership. Also called floating or skipping a title, it lets flippers evade sales tax and liability; most U.S. states treat it as a crime.
Title washing	Title washing is the fraudulent removal of a brand such as salvage or flood from a vehicle's title, usually by retitling the car in a state that does not recognize or carry over the original brand. Federal NMVTIS reporting exists largely to defeat the practice, but gaps and paperwork fraud persist.
TMU (true mileage unknown)	TMU (true mileage unknown) is a designation used on titles, auction listings, and vehicle history reports when a vehicle's actual mileage cannot be verified, commonly after a broken or replaced odometer, a suspected rollback, or a missing disclosure. A TMU vehicle is generally valued as high-mileage regardless of the displayed reading.
Total loss	A total loss is an insurer's determination that repairing a damaged vehicle is uneconomical, made when estimated repair costs meet the state's total-loss threshold or formula relative to the vehicle's actual cash value. Thresholds range from about 50 to 100 percent depending on the state, and totaled vehicles generally receive salvage titles.
Truth in Mileage Act (TIMA)	The Truth in Mileage Act (TIMA) is the 1986 U.S. federal law requiring sellers to disclose a vehicle's odometer reading on the title at transfer and prohibiting odometer tampering. It created the actual and not-actual mileage certifications on titles and underpins today's federal odometer disclosure rules administered by NHTSA.
TSB (technical service bulletin)	A TSB (technical service bulletin) is a manufacturer notice to dealership technicians describing a known problem on specific models and the recommended repair procedure. Unlike a recall, a TSB involves no safety-defect determination and repairs are not automatically free, though NHTSA publishes TSB summaries and they can support warranty or goodwill claims.
VDS (vehicle descriptor section)	The VDS (vehicle descriptor section) is positions four through nine of a 17-character VIN, encoding attributes such as model, body style, engine, and restraint system, plus the check digit in position nine. Each manufacturer defines its own VDS coding, which is why full decoding requires manufacturer-specific data rather than one universal table.
VIN (vehicle identification number)	A VIN (vehicle identification number) is the unique 17-character code assigned to every road vehicle built since 1981, standardized in the United States by federal regulation 49 CFR 565. It encodes the manufacturer, vehicle attributes, model year, assembly plant, and serial number, and it keys every title, registration, recall, and history record.
VIN cloning	VIN cloning is the crime of copying the vehicle identification number from a legally registered vehicle and attaching it to a stolen or salvage vehicle of the same make and model. A clone can pass casual checks; mismatches among the dash plate, door-jamb sticker, and hidden frame stampings are how inspections detect it.
VIN decoder	A VIN decoder is a tool that parses a 17-character VIN into its encoded attributes, including manufacturer, model, body style, engine, model year, and assembly plant, using the structure defined in 49 CFR 565 plus manufacturer submissions. NHTSA's free vPIC decoder is the authoritative public source for U.S.-market vehicles.
VINCheck	VINCheck is a free public lookup service from the National Insurance Crime Bureau that reports whether participating insurers have flagged a VIN as stolen and unrecovered or as a total-loss salvage record. Its coverage is limited to member-insurer data, so a clear VINCheck result does not guarantee a clean history.
VIS (vehicle identifier section)	The VIS (vehicle identifier section) is positions 10 through 17 of a 17-character VIN, containing the model year code, the assembly plant code, and the vehicle's sequential production number. Because the VIS identifies one specific vehicle rather than a model line, it is the portion that makes every VIN unique.
vPIC (Product Information Catalog and Vehicle Listing)	vPIC (Product Information Catalog and Vehicle Listing) is NHTSA's free public VIN-decoding platform and API, built from data manufacturers must submit under federal regulation. It decodes any U.S.-market VIN into make, model, body class, engine, plant, and safety equipment, making it the authoritative government source for VIN decoding.
WMI (world manufacturer identifier)	The WMI (world manufacturer identifier) is the first three characters of a VIN, identifying the vehicle's manufacturer, country or region of origin, and vehicle type under ISO 3780. SAE International assigns WMIs for the United States on NHTSA's behalf; VINs beginning with 1, 4, or 5 indicate U.S.-built vehicles.

Source:U.S. Department of Justice, Bureau of Justice Assistance — NMVTIS Glossary Electronic Code of Federal Regulations — 49 CFR Part 565 — Vehicle Identification Number Requirements

How to use these definitions

Match the exact wording on the title or report to the defined term before drawing conclusions.
Treat state-dependent terms (salvage, rebuilt, lemon buyback, bonded title) as jurisdiction-specific and confirm the issuing state's definition.
When two terms sound similar — total loss versus salvage, window sticker versus build sheet — read both definitions before comparing vehicles.
Use the free VIN decoder to establish identity before attaching any term to a specific vehicle.

Evidence

Primary sources behind this reference

Open the underlying public source and verify that its scope matches the question you are asking.

Quick answers

Frequently asked questions

What is the difference between a salvage title and a rebuilt title?

A salvage title marks a vehicle a state has designated as qualifying loss or damage; a rebuilt (or reconstructed) title is issued later, after repairs and the state's required inspection process. The salvage event stays in the vehicle's history.

What does a branded title mean?

A branded title carries a permanent state designation — such as salvage, flood, junk, or lemon buyback — describing a reported event that affects the vehicle's value or safety. Brand names and thresholds vary by state.

What is title washing?

Title washing is moving or re-titling a vehicle across jurisdictions so an existing brand, such as salvage or flood, stops appearing on the current title. Comparing the full multi-state title history by VIN is the practical defense.

What is NMVTIS?

The National Motor Vehicle Title Information System is the federal database, run by the U.S. Department of Justice, that participating states, insurers, and junk and salvage businesses must report to. Approved providers sell consumer reports drawn from it.