P064F

Internal Control Module EEPROM Error

P064F is a generic OBD-II powertrain diagnostic trouble code: Internal Control Module EEPROM Error. It is logged by the engine control unit when the powertrain monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P064F
Group
Powertrain
System
Powertrain
Severity
Warning (MIL on, possible limp mode)
Need P064F disabled?
RaceTune permanently disables any OBD-II trouble code on supported ECUs — for motorsport, off-road, and export use.
→

What P064F means

P064F indicates that the ECM or PCM has detected an error when reading from or writing to its internal EEPROM (Electrically Erasable Programmable Read-Only Memory). The EEPROM stores critical calibration data, learned adaptive values, and configuration parameters that the module requires for correct operation.

An EEPROM error can occur due to a corrupt write operation (often caused by a low-voltage event such as a dead battery or disconnection during an active write cycle), excessive erase/write cycles that have degraded the memory cells, or an internal hardware fault within the module. Some manufacturers also see this code after an incomplete or interrupted ECM reprogramming session.

The consequences vary depending on which data has been corrupted. The module may revert to base calibration values, losing learned adaptations, or it may be unable to function correctly at all. In many cases, the module requires replacement or, if supported by the manufacturer, a reflash procedure to restore EEPROM integrity. Verify that no power supply issues exist before replacing the module.

Common causes

Most-frequently reported root causes when P064F is logged.

  • 1
    Battery disconnection or voltage drop during an active EEPROM write cycle.
  • 2
    Interrupted or failed ECM reprogramming session corrupting EEPROM contents.
  • 3
    Worn EEPROM memory cells that have exceeded their rated erase/write cycle count.
  • 4
    Internal ECM hardware fault affecting the memory subsystem.
  • 5
    Unstable charging system causing voltage fluctuations during normal operation.
  • 6
    Incorrect or corrupted software installation during a dealer update.

Symptoms drivers notice

MIL illuminated.
Loss of learned adaptive values such as fuel trims, idle relearn, and transmission shift points.
Possible limp mode or reduced power operation.
Multiple additional DTCs may be present if calibration data is compromised.
Erratic or unstable engine operation immediately after the fault appears.

How to diagnose P064F

A typical diagnostic flow when this code is present.

  1. 1
    Record all DTCs and note any recent battery work, reprogramming, or electrical events.
  2. 2
    Check battery voltage and charging system output to rule out an ongoing low-voltage issue.
  3. 3
    Inspect ECM power supply and ground circuits for corrosion or high resistance.
  4. 4
    Attempt to clear the DTC and retest; some EEPROM errors are one-time events after a power interruption.
  5. 5
    If the code returns, check with the manufacturer for available ECM reflash or EEPROM restore procedures.
  6. 6
    If no reflash is available and the code persists, plan for ECM replacement.
  7. 7
    After any repair, perform all required relearn procedures before returning the vehicle to service.

Related powertrain codes

Frequently asked questions

Can P064F be cleared with a scan tool?

The code can be cleared, but if the underlying EEPROM is corrupted or hardware is faulty, it will return. Clearing alone does not fix the problem.

Will disconnecting the battery fix P064F?

A disconnection can sometimes trigger this code rather than fix it, particularly if it occurs mid-write. Do not disconnect the battery as a first diagnostic step.

Is P064F always a sign the ECM needs replacement?

Not always. If the fault was caused by a one-time power event and the code does not return after clearing, the module may be intact. Persistent faults usually indicate module replacement is needed.

Does P064F affect vehicle safety systems?

Potentially yes. If the EEPROM corruption affects calibration data used by safety-relevant functions, those systems may not operate correctly, making prompt diagnosis important.

Disabling P064F in software

RaceTune can permanently disable P064F — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECUs with a P064F disable in our catalogue

Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.

  • Bosch MD1CP004 verified 1 software version

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

Got P064F in your scan?

Upload your ECU file — we'll identify the exact software version and confirm whether a disable is available for your car.

Upload your file