There’s significant confusion in the automotive world between mileage blockers and odometer correction. Understanding the difference is crucial — one is a legitimate testing tool, the other is a federal crime.
What Is a Mileage Blocker?
A mileage blocker is a plug-and-play device that temporarily pauses mileage recording while it is active. When deactivated, the odometer resumes from exactly where it stopped. No data is changed, deleted or altered. This makes it a legitimate tool for dyno testing, track days, vehicle transport and off-road use on private land.
What Is Odometer Correction (Rollback)?
Odometer correction — also called odometer rollback or odometer fraud — involves using software to permanently change the mileage stored on a vehicle’s odometer to a lower number. This is illegal under the Federal Odometer Act across all 50 US states and can result in criminal prosecution, fines and imprisonment.
The Key Difference
A mileage blocker pauses recording in real time — it never alters historical data. Odometer correction changes historical data permanently. The former is a testing tool; the latter is fraud.
How We Approach This at Mileage Blocker USA
At Mileage Blocker USA, we supply mileage blockers only — never odometer correction software. All customers agree to use our devices for legitimate purposes only. See our full comparison guide here.