U1A00
0 owner reports and 31 manufacturer filings across 16 model years from Ford, Lincoln.
Where U1A00 shows up
Source: NHTSA manufacturer communications and complaints| Model year | Filed under | Bulletins | Owner reports | Parts |
|---|---|---|---|---|
| 2016 Ford Focus | Electrical System | 3 | — | Battery → |
| 2016 Ford C-MAX | Equipment | 2 | — | |
| 2024 Ford Escape | Electrical System | 2 | — | Battery → |
| 2016 Ford Expedition | Equipment | 2 | — | |
| 2024 Ford F-150 | Electrical System | 2 | — | Battery → |
| 2016 Ford Fiesta | Equipment | 2 | — | |
| 2016 Ford Flex | Equipment | 2 | — | |
| 2016 Ford Mustang | Equipment | 2 | — | |
| 2016 Ford Taurus | Equipment | 2 | — | |
| 2024 Lincoln Corsair | Electrical System | 2 | — | Battery → |
| 2016 Lincoln MKC | Equipment | 2 | — | |
| 2016 Lincoln MKS | Equipment | 2 | — | |
| 2016 Lincoln MKT | Equipment | 2 | — | |
| 2016 Lincoln Navigator | Equipment | 2 | — | |
| 2017 Ford Transit Connect | Electrical System | 1 | — | Battery → |
| 2023 Lincoln Corsair | Equipment | 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.
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U1A00 by make
The same record, one make at a time: the model years, bulletins and owner reports that name U1A00 on that maker’s vehicles.
What it gets filed under
31 manufacturer filings name U1A00. 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 U1A00.
- SSM 54727 Service bulletin2026-04-08 · Electrical System
- Some 2024 F-150/Escape/Corsair vehicles may exhibit no audio/no volume with diagnostic trouble code (DTC) U1A00:87 stored in the accessory protocol interface module (APIM). This may be due to the software in the front audio control module (ACM). To correct the condition, reprogram the ACM using the latest software level of the Ford Diagnosis and Repair System (FDRS). For claiming, use causal part
- SSM 54630 Service bulletin2026-03-05 · Electrical System
- Some 2024 F-150/Escape/Corsair vehicles may exhibit no audio/no volume with diagnostic trouble code (DTC) U1A00:87 stored in the accessory protocol interface module (APIM). This may be due to the software in the front audio control module (ACM). To correct the condition, reprogram the ACM using the latest software level of the Ford Diagnosis and Repair System (FDRS). For claiming, use causal part
- SSM 52261 Service bulletin2024-02-14 · Equipment
- Some 2023 Escape vehicles with hybrid powertrain built on or before 27-Oct-2023 and 2023 Corsair vehicles with hybrid powertrain built on or before 24-Oct-2023 may exhibit an intermittent no audio condition with diagnostic trouble code (DTC) U1A00:87 stored in the accessory protocol interface module (APIM). When the audio volume control is adjusted using the steering wheel or the center display sc
- SSM 46048 Service bulletin2016-09-02 · Electrical System
- Some 2016-2017 Ford and Lincoln vehicles equipped with SYNC 3 may have DTCs U3000:04, B108E:12 and/or U1A00:87 present in the APIM. If these DTCs are present and no other symptoms are reported by the customer, then clear the DTCs and retest. If the DTC(s) do not return then no further repairs should be attempted. If one or more DTCs return as current faults and/or the customer reports other sympto
- SSM-45809 Service bulletin2016-05-09 · Equipment — Other — Owners/Service/Other Manual
- SYNC 3 ACCESSORY PROTOCOL INTERFACE MODULE (APIM) DTCS U3000 OR B108E OR U1A00
What U1A00 means
Source: SAE J2012 / OBD-IIU1A00 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 U1A00
Source: NHTSA files and the OBD-II standardWhy does this page not define U1A00?
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 U1A00 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.