OBD-II code · Powertrain (generic)
P064F Unauthorized Software or Calibration Detected
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.
Is it safe to drive with P064F?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyUnauthorized tuning software flashed
Symptoms
- Check engine light on
- Possible limp mode or no-start
- Multiple follow-up faults across modules
- Reset/relearn may be needed after repair
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–6 h
- Emissions test
- Likely to fail
- Parts involved
- Ecm
Related codes
- P064CGlow Plug Control Module 1
- P064DInternal Control Module O2 Sensor Processor Performance Bank 1
- P064EInternal Control Module O2 Sensor Processor Performance Bank 2
- P0650Malfunction Indicator Lamp Control Circuit Malfunction
- P0651Sensor Reference Voltage B Circuit Open
- P0652Sensor Reference Voltage B Circuit Low
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.