Subaru bulletin 05-84-21R
What it saysThis bulletin announces availability of new front wheel hub assemblies incorporating bearing surfaces having increased resistance to imperfections resulting from shock loads. NHTSA’s full summary ↓
Subaru filed this with NHTSA as a service bulletin dated Dec 8, 2025, received Jan 6, 2026, about the suspension. It names 18 model years (2016–2021). 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 communicationThis bulletin announces availability of new front wheel hub assemblies incorporating bearing surfaces having increased resistance to imperfections resulting from shock loads.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 05-84-21R | Service bulletin | Dec 8, 2025 | 11027076 | PDF, 1,170 KB |
What the document itself lists
The manufacturer titles it “Front Wheel Hub Assembly- Design Change”.
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 28373VC000 | SBR (Japan) | — | eBay Motors → |
Read by machine from the document NHTSA serves (2 pages), read Sep 30, 2026. A part number is shown only where it matches Subaru’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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A weekly email, sent only in a week when Subaru files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 18 model years this bulletin names have filed 7,112 complaints with NHTSA since 2015.
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 suspension
Source: same model, same component group9 other manufacturer communications filed against these Subaru models under the same component group (suspension), newest first. The eight newest are listed; the rest are on the Subaru list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 05-62-18R | Service bulletin | Aug 31, 2026 | This bulletin provides a procedure to address customer concerns of surface rust accumulating in the top center retaining nut area of the fro… |
| 05-93-26 | Service bulletin | Jul 22, 2026 | This bulletin announces the design change made to the front coil spring to address cases of a rubbing sound heard driving over bumps and/or… |
| 05-96-26 | Service bulletin | Jan 12, 2026 | This bulletin announces design changes to the front stabilizer link to address concerns about boot cracking, which can allow grease to escap… |
| 05-97-25 | Service bulletin | Dec 16, 2025 | This Bulletin announces a design change to the rear stabilizer bar bushing to address knocking sounds as a result of excessive clearance bet… |
| 05-92-25R | Service bulletin | Dec 16, 2025 | This bulletin announces the design change made to the front lower control arms developed to address cases of a click or cracking type sound… |
| WQQ-52R | Service bulletin | Mar 24, 2025 | Due to incomplete repair instructions previously provided in the WQK-47 recall bulletin, the WQQ-52 recall will involve applying additional… |
| 05-92-25 | Service bulletin | Feb 3, 2025 | This bulletin announces the design change made to the front lower control arms developed to address cases of a click or cracking type sound… |
| 03-94-24 | Service bulletin | Sep 4, 2024 | This bulletin outlines the judgment criteria to be used when inspecting front transverse link bushings to reduce unnecessary bushing replace… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Subaru, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Subaru 05-84-21R 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 05-84-21R 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. Every Subaru warranty extension on file lists the ones Subaru has filed.
Which vehicles does 05-84-21R cover?
The manufacturer filed it against 18 model years: 2021 Subaru Forester, 2020 Subaru Forester, 2019 Subaru Forester, 2021 Subaru Legacy, 2020 Subaru Legacy, 2019 Subaru Legacy and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.