B15A5
0 owner reports and 44 manufacturer filings across 16 model years from Ford, Lincoln.
Where B15A5 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2020 Lincoln Nautilus | Electrical System | 6 | — | Battery → |
| 2021 Ford Mustang Mach-E | Electrical System | 4 | — | Battery → |
| 2021 Lincoln Aviator | Electrical System | 4 | — | Battery → |
| 2021 Lincoln Corsair | Electrical System | 4 | — | Battery → |
| 2020 Lincoln Corsair | Electrical System | 4 | — | Battery → |
| 2021 Lincoln Navigator | Electrical System | 4 | — | Battery → |
| 2020 Lincoln Navigator | Electrical System | 4 | — | Battery → |
| 2021 Lincoln Nautilus | Equipment | 3 | — | |
| 2022 Ford Mustang Mach-E | Electrical System | 2 | — | Battery → |
| 2022 Lincoln Corsair | Electrical System | 2 | — | Battery → |
| 2022 Lincoln Nautilus | Electrical System | 2 | — | Battery → |
| 2024 Ford Mustang Mach-E | Electrical System | 1 | — | Battery → |
| 2023 Ford Mustang Mach-E | Not specified | 1 | — | |
| 2024 Lincoln Aviator | Electrical System | 1 | — | Battery → |
| 2023 Lincoln Nautilus | Electrical System | 1 | — | Battery → |
| 2024 Lincoln Navigator | Electrical System | 1 | — | Battery → |
A model year appears here because the code is named in its record, not because every one of these vehicles sets it. Counts are mentions in the federal files, not failure rates — nobody publishes the denominator.
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B15A5 by make
The same record, one make at a time: the model years, bulletins and owner reports that name B15A5 on that maker’s vehicles.
What it gets filed under
44 manufacturer filings name B15A5. Start with what the maker wrote down.
A code names the test that failed, not the part. A bulletin that names it is often a diagnosis someone has already written down — quote its number at the service desk.
Manufacturer filings that name it
Source: NHTSA manufacturer communicationsService bulletins and campaigns whose filed summary names B15A5.
- SSM 54555 Service bulletin2026-02-06 · Electrical System
- Some 2020-2022-Corsair, 2021-2023 Nautilus, 2020-2024 Navigator/Aviator, and 2021-2024 Mustang Mach-E vehicles equipped with phone-as-a-key may exhibit various phone-as-a-key concerns with diagnostic trouble codes (DTC) U200D:15, U200E:15, U200F:15, B1589:31/49 through B1598:31/49, B1A56:31/49, B1D55:31/49, and/or B15A5:56 stored in the remote function actuator (RFA) module. If any of these DTCs a
- SSM 50845 Service bulletin2022-06-08 · Electrical System
- Some 2020-2022 Corsair/Nautilus/Navigator/Aviator, 2021-2022 Mustang Mach-E vehicles equipped with Phone-as-a-Key may exhibit Phone-as-a-Key concerns and have diagnostic trouble code(s) (DTC) U200D:15, U200E:15, U200F:15, B15**:31, B15**:49 and/or B15A5:56 stored in the remote function actuator (RFA) module. If the vehicle is exhibiting other symptoms outside of Phone-as-a-key concerns, address th
- SSM 50077 Service bulletin2021-09-01 · Equipment Adaptive/Mobility
- Some 2020-2021 Corsair/Nautilus/Navigator/Aviator, 2021 Mustang Mach-E vehicles equipped with Phone-as-a-Key may exhibit Phone-as-a-Key concerns and have diagnostic trouble code(s) (DTC) U200D:15, U200E:15, U200F:15, B15**:31, B15**:49 and/or B15A5:56 stored in the remote function actuator (RFA) module. If the vehicle is exhibiting other symptoms outside of Phone-as-a-key concerns, address those f
- SSM 49968 Service bulletin2021-07-21 · Electrical System
- Some 2020-2021 Corsair/Nautilus/Navigator/Aviator, 2021 F-150/Mustang Mach-E vehicles equipped with Phone-as-a-Key may have diagnostic trouble code(s) (DTC) U200D:15, U200E:15, U200F:15, B15**:31, B15**:49 and/or B15A5:56 stored in the remote function actuator (RFA) module. If any of these DTCs are detected during normal diagnostics, clear the DTCs, reflash RFA to the latest software level and sta
What B15A5 means
Source: SAE J2012 / OBD-IIB15A5 is a manufacturer-specific code: the second character is a 1, which under the OBD-II standard hands the definition to whoever built the vehicle. The same code can mean one thing on a Ford and something unrelated on a Hyundai. Any site that prints a single definition for it is guessing.
A stored code names the test that failed, never the part that caused it. It is the starting point of a diagnosis, not its conclusion — the same code has several possible causes and the cheap one is not always right.
Common questions about B15A5
Source: NHTSA files and the OBD-II standardWhy does this page not define B15A5?
Because it cannot be defined honestly. The second character of a trouble code says who owns its meaning, and a 1 or a 3 hands that to the manufacturer. Sites that print one definition for a manufacturer-specific code are showing you one automaker's meaning and hoping it is yours.
Can I keep driving with B15A5 stored?
Nobody can answer that from the code alone, and a site that does is guessing. A steady light means a fault was logged and the car should be checked soon; a flashing light means a severe misfire — slow down and get it seen as soon as possible, because severe misfire can quickly damage the catalytic converter. The safe read of this page is the mileage and the components, not permission.
Does a code mean the car is recalled?
No. Recalls are filed by campaign and matched by VIN, and none of them are triggered by a scan tool. If you want to know whether an open recall applies to one specific vehicle, check the VIN at nhtsa.gov/recalls — that is the only source that settles it.
Why do the counts here differ from other sites?
Because these are not estimates. Every number on this page is a count of documents in NHTSA's own files: manufacturer communications that name the code in their filed summary, and owner complaints that name it in the narrative. We do not model, weight or extrapolate them.
Will clearing the code fix it?
Clearing turns the light off and erases the freeze-frame data a technician would have used to work out what happened. If the condition is still there the code returns, usually within a few drive cycles, and the diagnosis now starts from less information than before.