Ford B1589
31/49 through 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 Manua
Quick answer
For 2021–2024 Ford Mustang Mach-E vehicles in the US, Ford/NHTSA communication SSM 54555 addresses B1589 when it appears among specific RFA diagnostic trouble codes after a self-test. The verified instruction is to use the latest software level, begin a new Ford Diagnosis and Repair System (FDRS) session, and verify whether the DTCs remain. If only the listed codes return, follow the normal Workshop Manual procedure.
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 B1589 mean?
For 2021–2024 Ford Mustang Mach-E vehicles in the US, Ford/NHTSA communication SSM 54555 addresses B1589 when it appears among specific RFA diagnostic trouble codes after a self-test. The verified instruction is to use the latest software level, begin a new Ford Diagnosis and Repair System (FDRS) session, and verify whether the DTCs remain. If only the listed codes return, follow the normal Workshop Manual procedure.
2. Technical explanation
Verified evidence identifies B1589 in the context of RFA self-test results, specifically alongside B1589:31/49 through B1598:31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56. The supplied bulletin excerpt does not expand the code’s component-level definition or identify a specific failed part. It instructs technicians to use the latest software level, start a new FDRS session, and verify that DTCs are no longer present. If only the listed DTCs return after the RFA self-test, the normal Workshop Manual procedure is to be followed.
3. What system is affected?
RFA, as named in the verified NHTSA/Ford communication. The full system name is not established by the supplied evidence.
4. How serious is this code?
Unknown. The supplied verified evidence does not assign a severity level.
5. Symptoms you may notice
- Not yet established by verified evidence.
6. Possible causes
- Not yet established by verified evidence. The supplied communication provides a diagnostic software/session instruction but does not identify a root cause or failed component.
7. Can I still drive the vehicle?
Unknown. The supplied verified evidence does not state whether the vehicle is safe to drive with B1589.
8. Can I charge the vehicle?
Unknown. The supplied verified evidence does not state whether the vehicle is safe to charge with B1589.
9. What you can safely do
- Arrange diagnosis by a Ford dealer or qualified service provider using Ford Diagnosis and Repair System (FDRS).
- Ensure the diagnostic process uses the latest software level, as specified in SSM 54555.
- Do not attempt high-voltage or module repair based on this code alone; no such repair procedure is established by the supplied evidence.
10. Step-by-step troubleshooting
- Use the latest software level.
- Start a new Ford Diagnosis and Repair System (FDRS) session.
- Verify whether the DTCs are no longer present.
- 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 the normal Workshop Manual procedure.
11. When to contact service
Service evaluation is appropriate because the verified communication directs use of FDRS and, when the listed DTCs return, the normal Workshop Manual procedure. Urgency is not established by the supplied evidence.
12. What the service center may check
- Confirm the vehicle has the latest applicable software level.
- Begin a new FDRS session.
- Perform/assess the RFA self-test and verify whether DTCs remain.
- When only the specified DTCs return, apply the normal Workshop Manual diagnostic procedure.
13. Possible repair or resolution
- No specific repair, replacement part, or final resolution is established by the supplied evidence.
- The verified path is updated diagnostic software, a new FDRS session, DTC verification, and normal Workshop Manual procedures when the specified codes return.
14. Affected vehicles
- Ford Mustang Mach-E · 2021–2024 · US
15. Related TSBs / service bulletins
- Ford SSM 54555, published by NHTSA as Manufacturer Communication 11028797 on 2026-02-06. It applies in the supplied data to 2021–2024 Ford Mustang Mach-E vehicles in the US and addresses the specified RFA DTC return condition after a self-test.
16. Recall information
- No recall is established by the supplied verified evidence.
17. Official manufacturer information
NHTSA Manufacturer Communication 11028797, Ford SSM 54555: https://static.nhtsa.gov/odi/ffdd/tsbs/TSBS_RECEIVED_2025-2026.zip#nhtsa_id=11028797
- NHTSA: NHTSA Manufacturer Communication 11028797: SSM 54555 · official_tsb
19. Frequently asked questions
What does Ford bulletin SSM 54555 instruct for B1589-related RFA codes?
Use the latest software level, start a new FDRS session, and verify that the DTCs are no longer present. If only the specified B1589:31/49 through B1598:31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56 codes return after an RFA self-test, follow the normal Workshop Manual procedure.
Which vehicles are covered by the supplied applicability data?
2021–2024 Ford Mustang Mach-E vehicles in the US.
Does the supplied evidence identify a failed component?
No. A specific root cause, component failure, or repair part is not yet established by verified evidence.
Can the vehicle be driven or charged with B1589?
Not yet established by verified evidence.