Lincoln bulletin 23B49 S2
What it saysCertain 2021 - 2023 Model Year Aviator Vehicles Equipped With SYNC - Reprogram Accessory Protocol Interface Module Owner letter submitted 09/06/23 NHTSA’s full summary ↓
Lincoln filed this with NHTSA as a service bulletin dated Jan 17, 2024, received Feb 7, 2024, about the electrical system. It names 3 model years (2021–2023). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationCertain 2021 - 2023 Model Year Aviator Vehicles Equipped With SYNC - Reprogram Accessory Protocol Interface Module Owner letter submitted 09/06/23
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23B49 S2 | Service bulletin | Jan 17, 2024 | 10249841 | PDF, 1,138 KB |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
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Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 140 complaints with NHTSA since 2015. 36 of them name Electrical System — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
I bought this car in march 2026. It is a 2023 Lincoln aviator black label, it was a CPO. Within days of me having it, I noticed there were electrical issues. The interior light kept popping on for no reason. The cooling seat feature was also not working. The adaptive cruise control was also not working correctly.
2023 Lincoln Aviator · Electrical System · filed with NHTSA Sep 14, 2026 · ODI 11764067
My vehicle’s camera system, including the backup camera, is experiencing an issue where the passenger-side camera fails to display properly, showing only a blank black area. I have reported this issue to my dealership for future inspection.
2021 Lincoln Aviator · Electrical System · filed with NHTSA Nov 6, 2025 · ODI 11698036
I had damage to my electrical system caused by rodents chewing wires. Upon researching this issue I have found that Ford Motor Company has used soy-based wire coatings which has led to this being a consistent problem with this vehicle.
2022 Lincoln Aviator · Electrical System · filed with NHTSA Jan 21, 2025 · ODI 11637250
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the electrical system
Source: same model, same component group78 other manufacturer communications filed against the Lincoln Aviator under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Lincoln list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| SSM 55256 | Service bulletin | Oct 16, 2026 | Some 2024-2026 Nautilus and 2025-2027 Explorer/Aviator vehicles equipped with power folding mirrors may exhibit concerns with the auto foldi… |
| SSM 55241 | Service bulletin | Oct 12, 2026 | Some 2025-2027 Aviator vehicles may exhibit a "Door Fault Service Required", "Transmission Not In Park" and/or "Hill Start Assist Not Availa… |
| SSM 55220 | Service bulletin | Oct 6, 2026 | Some 2024-2026 Nautilus and 2025-2026 Explorer/Aviator/Expedition/Navigator vehicles may experience Android Auto connection or general Bluet… |
| SSM 55208 | Service bulletin | Sep 25, 2026 | Some 2024-2026 F-150, 2025 Explorer/Aviator, 2025-2026 Expedition/Navigator, or 2026 F-Super Duty vehicles may exhibit diagnostic trouble co… |
| TCU-26.2.11.5 | Over-the-air update | Sep 24, 2026 | Quality improvements include: -Addresses key off load battery usage caused by the Telematics Control Unit's Wi-Fi not powering down properly… |
| SSM 55172 | Service bulletin | Sep 15, 2026 | Some 2025 Aviator/Explorer/Police Interceptor Utility vehicles may exhibit a "Steering Assist Fault Service Required" message and diagnostic… |
| BCM-26.DC | Over-the-air update | Sep 4, 2026 | Quality improvements include: - Enables the Open On Approach feature |
| SSM 55131 | Service bulletin | Aug 27, 2026 | Some 2025-2026 Aviator/Explorer/Expedition/F-150/Mustang Mach-E/Nautilus/Navigator vehicles may exhibit the hands-free BlueCruise feature in… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Lincoln, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Lincoln 23B49 S2 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 23B49 S2 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way.
Which vehicles does 23B49 S2 cover?
The manufacturer filed it against 3 model years: 2023 Lincoln Aviator, 2022 Lincoln Aviator, 2021 Lincoln Aviator. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.