Audi bulletin Circular 27BQ
What it saysUnder this service action, Audi dealers will replace the starter-alternator in affected vehicles at no cost to owners. NHTSA’s full summary ↓
Audi filed this with NHTSA as a service bulletin dated Apr 30, 2024, received May 7, 2024. It names 13 model years (2019–2020). 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 communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Under this service action, Audi dealers will replace the starter-alternator in affected vehicles at no cost to owners. A defective starter-alternator may inhibit start/stop functionality which could increase CO2 and other emissions while the vehicle is stopped. Emissions still remain within certification standards.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| Circular 27BQ | Service bulletin | Apr 30, 2024 | 10254023 | PDF, 847 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 4N0-903-028-S | Alternator VIN to Order | — | eBay Motors → |
| 4N1-903-028 | Alternator VIN to Order | — | eBay Motors → |
| 4N1-903-028-B | Alternator VIN to Order | — | eBay Motors → |
| 06M-121-488-A | GASKET Free Order | — | eBay Motors → |
| 06M-133-237-A | GASKET Free Order | — | eBay Motors → |
| 4M0-145-117 | SEAL RING Free Order | — | eBay Motors → |
Read by machine from the document NHTSA serves (20 pages), read Sep 30, 2026. A part number is shown only where it matches Audi’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 13 model years this bulletin names have filed 383 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.
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Audi, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Audi Circular 27BQ 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 Circular 27BQ 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 Circular 27BQ cover?
The manufacturer filed it against 13 model years: 2020 Audi A6, 2019 Audi A6, 2020 Audi A7, 2019 Audi A7, 2020 Audi A8, 2019 Audi A8 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.