One of the most common questions we get at Mileage Blocker USA is: “Will a mileage blocker show up on a diagnostic scan?” It’s a fair question, and the answer depends entirely on the quality of the device you’re using.
Why Cheap Devices Get Detected
Budget mileage blockers sold on generic marketplaces typically only block the dashboard display. Your vehicle stores speed and distance data in multiple locations — the instrument cluster is just one of them. Modern cars also log data in the ECU, the transmission control module, the ABS unit, and even in the infotainment system.
A cheap device that only blocks the dashboard will leave mismatched data across these modules, which any competent OBD scanner can detect.
Why Premium Devices Are Untraceable
Our vehicle-specific mileage blockers work at the CAN-Bus level, which means they intercept the speed signal at the source — before it reaches any module. Every module receives the same blocked signal simultaneously, so there is no data mismatch anywhere in the vehicle.
This means no fault codes are generated, no warning lights appear, no mismatch between stored module data, and diagnostic scanners find nothing unusual.
Is Your Vehicle Compatible?
We cover over 40 makes including BMW, Ford, Chevrolet, Mercedes, Audi, and many more. Use our vehicle search tool to find your specific year and model.