P064F

Unauthorized Software or Calibration Detected

Moderate severity

The ECU's secure boot or signature check has detected calibration data that is not signed by the manufacturer - typically appears after chip-tuning or unauthorised flash programming. The ECU may run on safe defaults or refuse to start.

Common causes

Unauthorized tuning software flashed
One of the most commonly reported causes for this code — check this first.
high
Typical part cost: $220-2200
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First things to check

1Confirm the code with a scan tool and check for additional related codes.
2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.

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Related codes

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Frequently asked questions

What does P064F mean?

P064F means "Unauthorized Software or Calibration Detected". It is a generic OBD-II code that points to a fault in the computer & auxiliary output controls.

What are the most common causes of P064F?

unauthorized tuning software flashed — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.

Can I keep driving with this code?

The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.

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