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Ford B1598

31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56 DTCs return in the RFA after a self-test, follow normal Workshop Manual (WSM) diagnostics

DriveNot yet established by verified evidence.
ChargeNot yet established by verified evidence.
ServiceService is appropriate because Ford directs normal WSM diagnostics when the listed DTCs return in the RFA after a self-test. Urgency is not established by verified evidence.
Confidence95%

Quick answer

For 2021–2024 Ford Mustang Mach-E vehicles in the US, B1598 is covered by Ford SSM 54555. If B1598:31/49 returns in the RFA after a self-test, Ford directs technicians to follow normal Workshop Manual (WSM) diagnostics.

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 B1598 mean?

For 2021–2024 Ford Mustang Mach-E vehicles in the US, B1598 is covered by Ford SSM 54555. If B1598:31/49 returns in the RFA after a self-test, Ford directs technicians to follow normal Workshop Manual (WSM) diagnostics.

2. Technical explanation

Verified evidence identifies B1598 in this context as a DTC that may return in the RFA after a self-test, alongside B1589:31/49 through B1598:31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56. The supplied Ford/NHTSA communication directs verification that DTCs are no longer present after starting a new Ford Diagnosis and Repair System (FDRS) session. If only the listed DTCs return in the RFA after a self-test, normal WSM diagnostics are to be followed.

3. What system is affected?

RFA. The full module name and its vehicle function are not yet established by verified evidence.

4. How serious is this code?

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

5. Symptoms you may notice

  • A B1598:31/49 DTC may return in the RFA after a self-test.
  • Other listed DTCs may return in the RFA after a self-test: B1589:31/49 through B1598:31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56.

6. Possible causes

  • Not yet established by verified evidence.

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

  • Arrange diagnosis by a Ford service provider or qualified technician using Ford procedures.
  • Do not attempt high-voltage or module repair based on this code alone.

10. Step-by-step troubleshooting

  1. Ford’s communication references starting a new FDRS session and verifying whether DTCs are no longer present.
  2. If only B1589:31/49 through B1598:31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56 return in the RFA after a self-test, follow normal WSM diagnostics.
  3. Further diagnostic steps are not established by the supplied verified evidence.

11. When to contact service

Service is appropriate because Ford directs normal WSM diagnostics when the listed DTCs return in the RFA after a self-test. Urgency is not established by verified evidence.

12. What the service center may check

  • Start a new Ford Diagnosis and Repair System (FDRS) session.
  • Verify whether DTCs are no longer present.
  • If only the specified DTCs return in the RFA after a self-test, perform normal Workshop Manual diagnostics.

13. Possible repair or resolution

  • The verified evidence does not specify a repair.
  • Resolution is determined through normal Ford Workshop Manual diagnostics if the specified DTCs return after the self-test.

14. Affected vehicles

15. Related TSBs / service bulletins

  • Ford SSM 54555, reported by NHTSA as Manufacturer Communication 11028797, published February 6, 2026. It applies in the supplied data to 2021–2024 Ford Mustang Mach-E vehicles in the US and addresses listed RFA DTCs returning after a self-test.

16. Recall information

  • No recall information was supplied or established by verified evidence.

17. Official manufacturer information

Official source: NHTSA Manufacturer Communication 11028797, Ford SSM 54555: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11028797

19. Frequently asked questions

What does Ford direct for B1598:31/49 that returns after an RFA self-test?

Ford directs normal Workshop Manual diagnostics when only the listed DTCs return in the RFA after a self-test.

Is B1598 confirmed to prevent driving or charging?

Not yet established by verified evidence.

Which vehicle is covered by the supplied applicability evidence?

2021–2024 Ford Mustang Mach-E vehicles in the US.

20. Sources & verification

Verified
Ford B1598: 31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56 DTCs… | EV Diagnostics