Warranty FAQ

Will ECU tuning void my Toyota warranty?

No — ECU tuning does not automatically void your entire Toyota warranty. Under U.S. law (Magnuson-Moss Warranty Act), Toyota must show that a modification caused a specific failure in order to deny coverage for that repair.

That said, tuning can affect how certain warranty claims are evaluated.

Can Toyota detect ECU tuning?

Additional clarity on dealer visibility: multiple customers working at Toyota have confirmed that after flashing with the COBB Accessport, the ECU calibration IDs for both engine and transmission remain identical to factory. This means a standard dealer health check does not indicate that the vehicle was reflashed when the Accessport is uninstalled. From the dealership side, the vehicle presents as stock at the calibration ID level.

What parts of the warranty are most affected by tuning?

Warranty concerns typically apply to powertrain-related components, including:

• Engine

• Turbocharger / supercharger (if equipped)

• Transmission

• Drivetrain

• Fuel and emissions-related systems

If a failure occurs in one of these areas, Toyota may deny coverage if they determine the tune contributed to the issue.

What parts of the vehicle are usually not affected?

Components unrelated to engine or drivetrain performance are generally unaffected, such as:

• Suspension

• Brakes

• Interior electronics

• Infotainment

• Body and trim components

These items are often still covered under warranty.