B1A03
0 owner reports and 20 manufacturer filings across 10 model years from Ford, Lincoln, Mazda.
Where B1A03 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2025 Ford Explorer | Not specified | 5 | — | |
| 2024 Mazda CX-90 | Seat Belts | 4 | — | |
| 2025 Mazda CX-70 | Seat Belts | 3 | — | |
| 2024 Mazda CX-30 | Seat Belts | 2 | — | |
| 2025 Ford Expedition | Not specified | 1 | — | |
| 2025 Lincoln Nautilus | Electrical System | 1 | — | Battery → |
| 2025 Lincoln Navigator | Not specified | 1 | — | |
| 2025 Mazda CX-90 | Seat Belts | 1 | — | |
| 2024 Mazda Mazda3 | Seat Belts | 1 | — | |
| 2023 Mazda Mazda3 | Seat Belts | 1 | — |
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.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
B1A03 by make
The same record, one make at a time: the model years, bulletins and owner reports that name B1A03 on that maker’s vehicles.
What it gets filed under
20 manufacturer filings name B1A03. 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 B1A03.
- SSM 54014 Service bulletin2025-07-03 · Unknown Or Other
- Some 2025 Explorer Active/Police Interceptor® Utility/Expedition/Navigator/Nautilus vehicles may exhibit diagnostic trouble codes (DTCs) B1A01:01, B1A02:01, B1A03:01, B1A04:01, B1A05:01 and/or B1A06:01 in the audio front control module (ACM) with no customer symptoms. This condition does not affect vehicle durability and no additional diagnosis or service is required.
- SSM 53100 Service bulletin2024-10-31 · Unknown Or Other
- Some 2025 Explorer Active/Police Interceptor Utility vehicles may exhibit diagnostic trouble codes (DTCs) B1A01:01, B1A02:01, B1A03:01, B1A04:01, B1A05:01 and/or B1A06:01 in the audio control module (ACM).
- SSM 52950 Service bulletin2024-09-26 · Unknown Or Other
- Some 2025 Explorer XLT/Police Interceptor Utility vehicles may exhibit diagnostic trouble codes (DTCs) B1A01:01, B1A02:01, B1A03:01, B1A04:01, B1A05:01 and/or B1A06:01 in the audio control module (ACM).
- 09-002-24c Service bulletin2024-07-08 · Seat Belts
- Some customers may complain that the warning sound in the passenger compartment (notifies i-ACTIVSENSE warnings, seat belt warning etc.) is too loud. Some of the volume settings in the notification and warning amplifier are not properly set. The control software of the notification and warning amplifier has been modified to eliminate this concern. CX-70 / CX-90 NOTE: This repair is also applicable
- SSM 52677 Service bulletin2024-06-28 · Electrical System
- Some 2025 Explorer XLT/Police Interceptor Utility vehicles may exhibit diagnostic trouble code (DTCs) B1A01:01, B1A02:01, B1A03:01, B1A04:01, B1A05:01 and/or B1A06:01 in the audio control module (ACM). This may be due a software concern within the ACM. If any of these DTCs are identified but the vehicle does not present any radio functionality concerns, replacement or reprogramming of the ACM will
- 09-002-24b Service bulletin2024-06-22 · Seat Belts
- Some customers may complain that the warning sound in the passenger compartment (notifies i-ACTIVSENSE warnings, seat belt warning etc.) is too loud. Some of the volume settings in the notification and warning amplifier are not properly set. The control software of the notification and warning amplifier has been modified to eliminate this concern. CX-70 / CX-90 NOTE: This repair is also applicable
What B1A03 means
Source: SAE J2012 / OBD-IIB1A03 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 B1A03
Source: NHTSA files and the OBD-II standardWhy does this page not define B1A03?
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 B1A03 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.