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Ford B15A5:56

31, B15**:57 and/or B15A5:56 DTC(s) returns in the RFA after a self test, follow normal Workshop Manual (WSM) diagnostics, Section 419-01C. APPLICABLE VEHICLES 2020 - 2021 CAR: TV

Common search variants: B15A556 · B15A5-56 · B15A5 56 · B15A5_56 · Search ignores case and common separators.

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceContact a Ford dealer or qualified Ford service provider if B15A5:56 is present, particularly if it returns after the documented RFA software update and self-test process.
Confidence95%

Quick answer

For applicable Ford Mustang Mach-E vehicles, B15A5:56 is documented in Ford/NHTSA manufacturer communications as a DTC stored in the Remote Function Actuator (RFA) module in Phone-as-a-Key-related diagnostics. Ford directs technicians to clear relevant DTCs, update the RFA to the latest software level, begin a new FDRS session, and verify whether the DTC returns. If only B15**:31, B15**:57 and/or B15A5:56 returns after an RFA self-test, follow Workshop Manual section 419-01C.

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 B15A5:56 mean?

For applicable Ford Mustang Mach-E vehicles, B15A5:56 is documented in Ford/NHTSA manufacturer communications as a DTC stored in the Remote Function Actuator (RFA) module in Phone-as-a-Key-related diagnostics. Ford directs technicians to clear relevant DTCs, update the RFA to the latest software level, begin a new FDRS session, and verify whether the DTC returns. If only B15**:31, B15**:57 and/or B15A5:56 returns after an RFA self-test, follow Workshop Manual section 419-01C.

2. Technical explanation

Verified Ford manufacturer communications identify B15A5:56 as an RFA-module DTC addressed in a Phone-as-a-Key diagnostic context. The communications state that other vehicle symptoms outside Phone-as-a-Key concerns should be addressed first. When the listed DTCs are detected during diagnostics, the documented process is to clear the DTCs, reflash the RFA to the latest software level, start a new Ford Diagnosis and Repair System (FDRS) session, and verify that the DTCs are no longer present. If only B15**:31, B15**:57 and/or B15A5:56 returns after an RFA self-test, Ford directs use of normal Workshop Manual diagnostics in section 419-01C.

3. What system is affected?

Remote Function Actuator (RFA) module. The supplied evidence associates the bulletin process with Phone-as-a-Key concerns.

4. How serious is this code?

Unknown. The supplied verified evidence does not assign a severity level.

5. Symptoms you may notice

  • A Phone-as-a-Key concern is the diagnostic context identified by the Ford communications.
  • Other symptoms are not established by the supplied verified evidence.

6. Possible causes

  • The supplied evidence documents a software update and subsequent Workshop Manual diagnostic path, but does not establish a specific root cause for B15A5:56.
  • If the code returns after the documented software update and RFA self-test, Ford directs normal Workshop Manual diagnostics under section 419-01C.

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

  • If the vehicle has symptoms outside Phone-as-a-Key concerns, have those concerns addressed first, consistent with the Ford communication.
  • Arrange diagnosis by a Ford-qualified service provider with access to FDRS and the applicable Workshop Manual procedures.
  • Do not attempt module reflashing or other service procedures unless appropriately equipped and qualified.

10. Step-by-step troubleshooting

  1. Ford's documented technician process is to clear the relevant DTCs.
  2. Reflash the RFA module to the latest software level.
  3. Start a new Ford Diagnosis and Repair System (FDRS) session.
  4. Verify whether the DTCs are no longer present.
  5. If only B15**:31, B15**:57 and/or B15A5:56 returns after an RFA self-test, follow Workshop Manual section 419-01C.

11. When to contact service

Contact a Ford dealer or qualified Ford service provider if B15A5:56 is present, particularly if it returns after the documented RFA software update and self-test process.

12. What the service center may check

  • Confirm whether the concern is limited to Phone-as-a-Key or whether other vehicle symptoms are present.
  • Read DTCs in the RFA module.
  • Clear the relevant DTCs.
  • Update/reflash the RFA to the latest software level using Ford Diagnosis and Repair System (FDRS).
  • Start a new FDRS session and confirm whether the DTC remains absent.
  • If only B15**:31, B15**:57 and/or B15A5:56 returns after self-test, use Workshop Manual section 419-01C diagnostics.

13. Possible repair or resolution

  • The verified communications specify RFA reprogramming to the latest software level and a new FDRS session as the initial documented resolution path.
  • If the listed DTCs no longer return after this process, the communications direct verification of their absence.
  • If only B15**:31, B15**:57 and/or B15A5:56 returns after self-test, the next documented path is normal Workshop Manual section 419-01C diagnostics.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Ford SSM 50845, published June 8, 2022; NHTSA manufacturer communication MC-10214161-0001. It includes 2020-2022 C-EV applicability and the RFA reflash/FDRS verification process.
  • Ford SSM 50077, published September 1, 2021; NHTSA manufacturer communication MC-10201575-0001. It includes 2020-2021 C-EV applicability and the RFA reflash/FDRS verification process.
  • Ford SSM 49968, published July 21, 2021; NHTSA manufacturer communication MC-10199511-0001. It identifies B15A5:56 in the RFA and provides the RFA reflash/FDRS verification process.

16. Recall information

  • No recall is established by the supplied verified evidence.

17. Official manufacturer information

Official NHTSA-hosted Ford manufacturer communications: SSM 50845: https://static.nhtsa.gov/odi/tsbs/2022/MC-10214161-0001.pdf ; SSM 50077: https://static.nhtsa.gov/odi/tsbs/2021/MC-10201575-0001.pdf ; SSM 49968: https://static.nhtsa.gov/odi/tsbs/2021/MC-10199511-0001.pdf

19. Frequently asked questions

What does B15A5:56 mean on a Ford Mustang Mach-E?

The supplied Ford communications identify it as a DTC stored in the Remote Function Actuator (RFA) module in a Phone-as-a-Key diagnostic context. A more specific fault definition is not established by the supplied verified evidence.

What does Ford instruct technicians to do for B15A5:56?

Ford documents clearing the relevant DTCs, reflashing the RFA to the latest software level, starting a new FDRS session, and verifying that the DTCs no longer appear. If only B15**:31, B15**:57 and/or B15A5:56 returns after an RFA self-test, Ford directs Workshop Manual section 419-01C diagnostics.

Can I drive or charge with B15A5:56?

Not yet established by verified evidence.

Does B15A5:56 prove that a part must be replaced?

No. The supplied evidence first specifies an RFA software update and verification procedure, then directs Workshop Manual diagnostics if the listed codes return. It does not establish a required replacement part.

20. Sources & verification

Verified
Ford B15A5:56: 31, B15**:57 and/or B15A5:56 DTC(s) returns in the RFA… | EV Diagnostics