OBD2 Car ScannerWhat does P064F mean?
P064F stands for Unauthorized Software/Calibration Detected. The engine computer has found a fault in one of its own circuits or in a circuit it controls.
Powertrain codes cover the engine, transmission and emissions. When the car's computer sees a reading outside its normal range, it stores this code and may turn on a warning light on the dashboard.
Common causes
- Damaged wiring or a loose connector
- Low battery voltage or poor ground
- Faulty relay or actuator
- In rare cases, a faulty engine control module
What to do
- Read all stored and pending codes with a scanner. Several codes together often point to one cause.
- Note the freeze frame data (speed, temperature, load) recorded when the code was set.
- Inspect the wiring and connectors of the part named in the code for damage, corrosion or looseness.
- Fix the most likely and cheapest cause first, then clear the code and drive to see if it comes back.
Read this code from your own car
Plug in a cheap ELM327 adapter and the app shows every fault code, what it means and how to fix it.
Frequently asked questions
What does P064F mean?
P064F means “Unauthorized Software/Calibration Detected”. It belongs to the computer and output circuits group: The engine computer has found a fault in one of its own circuits or in a circuit it controls.
Is it safe to drive with P064F?
You can usually drive carefully for a short time, but fix it soon to avoid further damage or higher fuel use.
How do I clear P064F?
Fix the cause, then clear the code with an OBD2 scanner or app. If the fault is still there, the code will come back.
Related codes
- P064BPTO Control Module
- P064CGlow Plug Control Module
- P064DInternal Control Module O2 Sensor Processor Performance Bank 1
- P064EInternal Control Module O2 Sensor Processor Performance Bank 2
- P0650Malfunction Indicator Lamp (MIL) Control Circuit Malfunction
- P0651Sensor Reference Voltage B Circuit Open
- P0652Sensor Reference Voltage B Circuit Low
- P0653Sensor Reference Voltage B Circuit High
Code meanings can vary by manufacturer. This page is general guidance, not a repair manual. Always confirm the cause before replacing parts.