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)
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What P064F means

P064F indicates that the ECM/PCM (or another control module) has detected an error while 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 the module needs for correct operation, and the module verifies this memory with a checksum on power-up.

An EEPROM error most commonly follows a corrupt write, typically a low-voltage event such as a weak battery, or a battery disconnection or programming session interrupted during an active write. Voltage dropping too low during a flash/reflash, or a prematurely terminated programming session, can leave the memory block corrupt so the module detects the fault on its next power-on check. Worn memory cells that have exceeded their rated erase/write cycles and internal hardware faults are additional causes.

Consequences depend on which data is affected. The module may revert to base calibration and lose learned adaptations, or it may be unable to operate correctly, producing stalling, a no-start, or transmission problems. In many cases the module needs a reflash where supported, or replacement. Because a low-voltage condition is a frequent trigger, always confirm the battery and charging system before condemning the module.

Common causes

Most-frequently reported root causes when P064F is logged.

  • 1
    Low battery voltage or a voltage drop during an active EEPROM write cycle.
  • 2
    Battery disconnection or interrupted programming corrupting EEPROM contents.
  • 3
    Failed or terminated ECM flash/reflash session leaving corrupt memory.
  • 4
    Worn EEPROM memory cells that have exceeded their rated erase/write count.
  • 5
    Internal ECM hardware fault affecting the memory subsystem.
  • 6
    Unstable charging system causing voltage fluctuations during operation.
  • 7
    Incorrect or corrupted software installed during an update.

Symptoms drivers notice

MIL illuminated.
Loss of learned adaptive values such as fuel trims, idle and shift adaptations.
Engine stalling, no-start, or transmission issues.
Possible limp mode or reduced power operation.
Multiple additional DTCs if calibration data is compromised.

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 condition.
  3. 3
    Inspect ECM power supply and ground circuits for corrosion or high resistance.
  4. 4
    Clear the DTC and retest, since some EEPROM errors are one-time events after a power interruption.
  5. 5
    If the code returns, check for a manufacturer ECM reflash or EEPROM restore procedure.
  6. 6
    If no reflash is available and the fault persists, plan for module replacement.
  7. 7
    After 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?

It can be cleared, but if the EEPROM data is corrupt or the hardware has failed it will return; clearing alone does not fix the fault.

Will disconnecting the battery fix P064F?

No. A disconnection mid-write can actually trigger this code, so it is not a recommended first step; check charging voltage instead.

Is P064F always a sign the module needs replacing?

Not always. A one-time power event may not recur after clearing, whereas a persistent fault usually means a reflash or module replacement is required.

Can low battery voltage cause P064F?

Yes. Low voltage during a write or during programming is a frequent trigger, so the battery and charging system should be verified first.

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.

ECU families we can disable P064F on

We hold the DaVinci A2L disable definitions for these families, so the exact P064F path and mask addresses are mapped. verified marks a confirmed disable definition. We support many more — upload your file and our identifier will match it automatically.

  • Bosch MD1CP004 verified

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.

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