Lincoln bulletin SSM 51775
What it saysSome 2020-2021 Aviator vehicles equipped with all-wheel drive (AWD) built on or before 30-Aug-2021 may require replacement of the left front halfshaft, part number L1MZ-3A427-G. NHTSA’s full summary ↓
Lincoln filed this with NHTSA as a service bulletin dated Jul 6, 2023, received Jul 12, 2023, about the equipment. It names 2 model years (2020–2021). 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Some 2020-2021 Aviator vehicles equipped with all-wheel drive (AWD) built on or before 30-Aug-2021 may require replacement of the left front halfshaft, part number L1MZ-3A427-G. If the halfshaft is unavailable due to a part backorder situation, dealers can perform Technical Service Bulletin (TSB) 23-2114. The TSB Service Procedure uses a revised halfshaft and intermediate shaft, which eliminates the front axle disconnect actuator assembly and requires an all-wheel-drive (AWD) module software update. Unless the specific TSB criteria are met, TSB 23-2144 should not be performed if halfshaft part number L1MZ-3A427-G is available.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SSM 51775 | Service bulletin | Jul 6, 2023 | 10239097 | PDF, 60 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| L1MZ-3A427-G | Built On Or Before 20-Aug-2021 | — | eBay Motors → |
Read by machine from the document NHTSA serves (1 page), read Sep 30, 2026. A part number is shown only where it matches Lincoln’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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.
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 2 model years this bulletin names have filed 166 complaints with NHTSA since 2015. 27 of them name Power Train — 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.
The contact owns a 2021 Lincoln Aviator. The contact stated that while her husband was driving 60 MPH in the left lane, the rear end locked up, and the vehicle fishtailed before coming to a complete stop between the left lane and the shoulder of the roadway. The driver attempted to restart the vehicle, but the vehicle failed to start.
2021 Lincoln Aviator · Power Train · filed with NHTSA Sep 23, 2026 · ODI 11766329
Vehicle shifted into neutral while driving. Had to stop the vehicle in the median to put it back in drive
2020 Lincoln Aviator · Power Train · filed with NHTSA Oct 13, 2021 · ODI 11436553
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 equipment
Source: same model, same component group8 other manufacturer communications filed against the Lincoln Aviator under the same component group (equipment), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 22M03 S1 | Service bulletin | Apr 12, 2024 | Certain 2017-2020 Model Year Continental and Super Duty, 2018-2020 Navigator, 2020 Aviator, and 2020 Explorer Vehicles Replace Front and/or… |
| TSB 24-2043 | Service bulletin | Feb 22, 2024 | This article supersedes TSB 23-2208 to add 2024 model year vehicles. Some 2020-2024 Explorer/Aviator non-hybrid vehicles may exhibit radio s… |
| SSM 52264 | Service bulletin | Feb 15, 2024 | Some 2020-2024 Aviator vehicles may exhibit concerns that reqiure loadspace trim panel vent register replacement. The vent register is now a… |
| TSB 23-2307 | Service bulletin | Oct 5, 2023 | Some 2019-2020 Edge/F-150/Fusion/Continental/MKZ/Nautilus, 2019-2021 Mustang/Ranger/Transit Connect, 2020-2021 EcoSport/Escape/Expedition/Ex… |
| SSM 51937 | Service bulletin | Sep 20, 2023 | Some vehicles equipped with power folding mirrors may exhibit power folding mirrors that are inoperative or exhibit a clicking sound. This m… |
| TSB 23-2208 | Service bulletin | Jul 13, 2023 | Some 2020-2023 Explorer/Aviator non-hybrid vehicles may exhibit radio static and/or poor radio sound quality when moving. This may be more n… |
| SSM 51720 | Service bulletin | Jun 16, 2023 | Some 2020-2023 Explorer/Aviator vehicles may have a concern where the second row outboard manual/power seats do not fold, exhibit excess eff… |
| SSM 51687 | Service bulletin | Jun 7, 2023 | TSB 22-2428 is missing some labor operations. For any missing labor operations, claim available new model labor operations or m-time. Refer… |
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 SSM 51775 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 SSM 51775 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 SSM 51775 cover?
The manufacturer filed it against 2 model years: 2021 Lincoln Aviator, 2020 Lincoln Aviator. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built on or before 20 Aug 2021; 2020-2021 Aviator: built on or before 30 Aug 2021 — the build date is on the certification label in the driver’s door jamb.