Two terms that often get confused in the automotive world are “mileage blocker” and “mileage correction.” While they sound similar, they are fundamentally different in purpose, legality, and technology.
What Is Mileage Correction?
Mileage correction (also called odometer rollback) involves using software to change the recorded mileage on your vehicle’s odometer to a lower number. This practice is illegal in all 50 US states under the Federal Odometer Act and can result in criminal prosecution.
What Is a Mileage Blocker?
A mileage blocker is a hardware device that temporarily pauses mileage recording while the device is active. When deactivated, the odometer resumes counting from exactly where it stopped. No data is changed, removed, or altered. This makes it a legitimate tool for dyno and chassis testing, track day use, vehicle transport, and off-road testing.
Why the Distinction Matters
Mileage correction is retroactive fraud. A mileage blocker is a real-time testing tool. At Mileage Blocker USA, we only supply mileage blockers — never correction software — and all our customers agree to use devices responsibly.