Mileage Blocker vs Odometer Correction Tool — Understanding the Difference
These two terms are often confused — but they refer to very different devices with very different purposes. Understanding the difference is important, especially if you’re looking for a legal solution for dyno testing or off-road use.
What Is a Mileage Blocker?
A mileage blocker (also called an odometer stopper or CAN Bus filter) prevents mileage from being recorded while it’s active. It does not change or alter any existing mileage data — it simply pauses the recording process. When you remove the device, your odometer resumes from exactly where it left off before you plugged in the blocker.
Key characteristics:
- Works by intercepting the CAN Bus speed signal
- Prevents new mileage from being recorded during use
- Does not alter existing mileage data
- Completely reversible
- Legal to purchase and own in the USA
- Designed for dyno testing, off-road use, and private testing
What Is an Odometer Correction Tool?
An odometer correction tool (also called a rollback tool or mileage correction device) is used to physically alter the existing mileage data stored in a vehicle’s ECU. These tools are used in legitimate scenarios such as replacing a faulty instrument cluster — where a technician needs to programme the new cluster to match the correct vehicle mileage.
Key characteristics:
- Changes or writes new mileage data to the ECU
- Used legitimately for instrument cluster replacement
- When misused to misrepresent mileage during a vehicle sale — this is odometer fraud, which is a federal crime in the USA
Which One Is Legal in the USA?
A mileage blocker is legal to purchase and own in the USA. Using one on public roads or misrepresenting mileage when selling a vehicle is illegal — but owning one for dyno testing and off-road use is entirely within the law.
Misusing an odometer correction tool to wind back mileage with the intention of deceiving a buyer constitutes odometer fraud — a federal offence under the Motor Vehicle Information and Cost Savings Act, punishable by significant fines and imprisonment.
Which Device Do We Sell?
We sell exclusively mileage blockers — devices that prevent recording during testing without altering any existing data. They are designed for dyno testing, off-road use, and performance evaluation on private property.