# What is vehicle identification number?

> A vehicle identification number is the unique 17-character code assigned to most modern vehicles.

Glossary date: April 27, 2026.

## How it works

Insurers use the VIN to identify a vehicle's year, manufacturer, model, equipment, and history. One wrong character can point to a different vehicle.

## Example

A quote lists a base trim, but the VIN identifies a different trim with other safety equipment. Correcting it changes the policy record.

## Why it matters

An incorrect VIN can cause registration, lender, pricing, or claim delays.

## What to check on your policy

Compare the policy VIN with the dashboard plate, registration, and title character by character.

Coverage, definitions, limits, and legal requirements vary by policy and state. Your declarations page and policy forms control your coverage.

## Related terms

- [Declarations page](https://locations.goautoinsurance.com/car-insurance-glossary/declarations-page.md)
- [Garaging address](https://locations.goautoinsurance.com/car-insurance-glossary/garaging-address.md)
- [Insurance underwriting](https://locations.goautoinsurance.com/car-insurance-glossary/insurance-underwriting.md)

- [Car insurance guide](https://locations.goautoinsurance.com/car-insurance-guide.md)
- [Complete glossary](https://locations.goautoinsurance.com/car-insurance-glossary.md)