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Ford P0AA4

Reset Diagnostic Trouble Code (DTC) Occurrence Counter application in FDRS. © 2024 Ford Motor C

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Ford dealer or qualified Ford EV service provider. The verified procedure requires Ford FDRS access.
Confidence95%

Quick answer

For 2021–2022 Ford Mustang Mach-E vehicles in the US, Ford TSB 24-2017 references P0AA4 in a battery energy control module (BECM) service workflow. If P0AA4 remains after stored concern-related DTCs are cleared, Ford instructs technicians to run the BECM “Reset Diagnostic Trouble Code (DTC) Occurrence Counter” application in FDRS.

This page separates verified manufacturer/regulator evidence from supporting material. Unsupported causes, repairs or safety conclusions are not guessed.

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1. What does P0AA4 mean?

For 2021–2022 Ford Mustang Mach-E vehicles in the US, Ford TSB 24-2017 references P0AA4 in a battery energy control module (BECM) service workflow. If P0AA4 remains after stored concern-related DTCs are cleared, Ford instructs technicians to run the BECM “Reset Diagnostic Trouble Code (DTC) Occurrence Counter” application in FDRS.

2. Technical explanation

Verified evidence does not provide a component-level definition, fault mechanism, or diagnostic threshold for P0AA4. The supplied Ford service-bulletin evidence establishes that P0AA4 can remain present with P0ADA, P0ADE, and/or P0AA1 after DTC clearing, and that the specified next step is an FDRS BECM application to reset the DTC occurrence counter.

3. What system is affected?

Battery Energy Control Module (BECM), based on the referenced FDRS application.

4. How serious is this code?

Not yet established by verified evidence.

5. Symptoms you may notice

Not yet established by verified evidence.

6. Possible causes

Not yet established by verified evidence. A diagnostic identifier alone is not proof that a specific component has failed.

7. Can I still drive the vehicle?

Not yet established by verified evidence.

8. Can I charge the vehicle?

Not yet established by verified evidence.

9. What you can safely do

  • Have the vehicle evaluated by a Ford dealer or qualified technician with access to Ford Diagnostic and Repair System (FDRS).
  • Do not attempt high-voltage battery or BECM repair based on this code alone.

10. Step-by-step troubleshooting

  1. Ford TSB 24-2017 directs technicians to clear stored DTCs related to the concern.
  2. If P0ADA, P0ADE, P0AA1, and/or P0AA4 remain present, the bulletin directs use of the BECM “Reset Diagnostic Trouble Code (DTC) Occurrence Counter” application in FDRS.
  3. The bulletin notes that only one module may be updated at a time.

11. When to contact service

Contact a Ford dealer or qualified Ford EV service provider. The verified procedure requires Ford FDRS access.

12. What the service center may check

  • Confirm whether P0AA4 remains after concern-related stored DTCs are cleared.
  • Run the BECM “Reset Diagnostic Trouble Code (DTC) Occurrence Counter” application in FDRS when applicable.
  • Observe the bulletin note that only one module may be updated at a time.

13. Possible repair or resolution

  • The verified evidence identifies an FDRS BECM occurrence-counter reset as the specified action when P0AA4 remains present. Whether further repair is required is not yet established by verified evidence.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Ford TSB 24-2017, published January 26, 2024 (NHTSA manufacturer communication PDF 10249760), references P0AA4 for applicable 2021–2022 US Mustang Mach-E vehicles.

16. Recall information

No recall relationship is established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication PDF 10249760, Ford TSB 24-2017: https://static.nhtsa.gov/odi/tsbs/2024/MC-10249760-0001.pdf

19. Frequently asked questions

What does Ford instruct for P0AA4?

After clearing stored DTCs related to the concern, if P0AA4 remains present, Ford TSB 24-2017 instructs technicians to download and run the BECM Reset Diagnostic Trouble Code (DTC) Occurrence Counter application in FDRS.

Which vehicles are supported by the supplied evidence?

The verified applicability record identifies US-market 2021–2022 Ford Mustang Mach-E vehicles.

Is P0AA4 safe to drive or charge with?

Not yet established by verified evidence.

20. Sources & verification

ReferenceAccepted ResearchVerified
Ford P0AA4: Reset Diagnostic Trouble Code (DTC) Occurrence Counter… | EV Diagnostics