P064F

Unauthorized Software/Calibration Detected

Q: Is it safe to drive with P064F?

Be cautious. The car may force reduced power or limp mode when it distrusts its own software, and it can fail emissions. Have the calibration corrected soon.

Q: Can I just clear P064F?

Clearing won't help — the module re-checks its calibration and sets the code again. The fix is restoring authorized OE software.

ECM/PCM programming Generic OBD-II High

What it means

P064F means the ECM/PCM has determined that its own software or calibration is unauthorized or doesn't match what it expects — commonly after an aftermarket tune or an interrupted reflash. The module may respond by cutting power or entering limp mode, and the car can fail emissions. The fix is restoring the correct, authorized factory calibration.

High

Can I keep driving? Risky — the ECM has flagged its software as unauthorized or mismatched and may force reduced power or limp mode. It can also fail emissions. Get the calibration corrected.

Real-world scan data

Seen in

scans in the past year

Found in

<0.1%

of scans

<0.1%

of scans that found faults

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

Common symptoms

What you'll notice

Check-engine light on
Reduced power or limp mode in some cases
Failed emissions/readiness test
Often appears after tuning or a software update

Common causes

Most likely first

Aftermarket tune or unauthorized reflash of the ECM/PCMLikely
Incomplete, interrupted, or failed programming/updateCommon
Calibration that doesn't match the module or vehicleCommon
Corrupted ECM softwareLess often
Faulty ECM (checked last)Less often

How to diagnose & fix

Work through it in order

Confirm whether the vehicle has an aftermarket tune; if so, restore the factory calibration.
Reflash the ECM/PCM with the correct, current OE software using a capable scan tool.
Verify the calibration and VIN match the vehicle after programming.
Clear the code and re-run readiness monitors before any emissions test.
Replace and properly program the ECM only if the software is confirmed corrupted and unrecoverable.

FAQ

Quick answers

Is it safe to drive with P064F?+

Be cautious. The car may force reduced power or limp mode when it distrusts its own software, and it can fail emissions. Have the calibration corrected soon.

Can I just clear P064F?+

Clearing won't help — the module re-checks its calibration and sets the code again. The fix is restoring authorized OE software.

Read & clear P064F yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX