Audi bulletin Circ 91FN_REV1
What it saysAffected vehicles will receive the latest software version via a software update. NHTSA’s full summary ↓
Audi filed this with NHTSA as a service bulletin dated Jan 30, 2024, received Feb 6, 2024, about the electrical system. It names 2 model years (2022–2023). 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 communicationAffected vehicles will receive the latest software version via a software update. This software contains an optimized self-diagnosis function for the high-voltage battery. In addition to the software update, the high-voltage battery cells may experience an increased self-discharge. The high-voltage battery will be evaluated, and any affected high-voltage cell modules will be replaced.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| Circ 91FN_REV1 | Service bulletin | Jan 30, 2024 | 10249584 | PDF, 4,947 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 0Z1-915-599-J | CELL MOD | — | eBay Motors → |
| 0Z1-998-474 | SEP. FILM | — | eBay Motors → |
| 1HV-915-754-A | VALVE | — | eBay Motors → |
| 0Z1-915-433-C | GASKET | — | |
| 1EA-802-131-A | — | — | |
| 1EA-802-132-A | — | — | |
| 1EA-998-103 | SEP. FILM | — | eBay Motors → |
| 1EA804841AC | HOUSING | — | |
| 1EA804973 | HOLDER | — | |
| 1EA010505 | WARN. SIGN | — | eBay Motors → |
| 12E010006AA | STICKER | — |
Read by machine from the document NHTSA serves (48 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.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the software for the 2023 Q4 e-tron →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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 38 complaints with NHTSA since 2015. 24 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.
The trunk power liftgate is often falsely activated by the foot-activated sensor. Even when your feet are not moving, if they are anywhere near the sensor it can set it off. This causes the hatch to close on you when you're standing under it with no way to stop it. This happens suddenly with very little warning.
2022 Audi Q4 e-tron · Electrical System · filed with NHTSA Oct 18, 2024 · ODI 11620660
Repeated A/C Failure in Extreme Heat Component: Air conditioning/cabin cooling Mileage: Approximately 49,350 miles as of XXX The vehicle repeatedly loses all A/C cooling in cabin in extreme heat (100°+F), with cooling returning in cooler weather. On XXX, traveling to , the A/C failed near .
2023 Audi Q4 e-tron · Electrical System · filed with NHTSA Oct 12, 2026 · ODI 11770660
As I was coasting into a parking space perpendicular to a curb, sidewalk, and store fronts, about a foot from the curb, the engine ROARED and rapidly accelerated. I removed my foot from the pedal and crashed into a pole supporting the canopy over the sidewalk.
2022 Audi Q4 e-tron · Electrical System · filed with NHTSA Dec 18, 2024 · ODI 11631328
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 group340 other manufacturer communications filed against the Audi Q4 e-tron under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Audi list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_2068573_6 | Service bulletin | Sep 18, 2026 | This bulletin provides information when the rear parking sensor sometimes does not work, rear parking sensor loose, rear parking sensor faul… |
| TSB_2082962_2 | Service bulletin | Sep 14, 2026 | This bulletin provides a combined software update; ID. S 5.6.3 for Audi Q4 V7T BL. |
| TSB_2083185_1 | Service bulletin | Sep 8, 2026 | This bulletin provides information when timer-based charging is faulty; charging target exceeded (Q4 e-tron). |
| TSB_2082961_2 | Service bulletin | Sep 8, 2026 | This bulletin provides information about the combined softare update ID. S 5.6.3 Audi Q4 - with V7G and without S7E. |
| TSB_2083187_1 | Service bulletin | Sep 2, 2026 | This bulletin provides informaiotn when the vehicle does not charge; HV charging connector lock faulty. DTC 00C6, P0D9400. |
| TSB_2079214_4 | Service bulletin | Sep 2, 2026 | This bulletin provides information regarding fault finding and repair information for electric tailgate. |
| TSB_2077780_4 | Service bulletin | Sep 2, 2026 | This bulletin provides information when the charging target cannot be adjusted in the MMI. |
| TSB_2074258_2 | Service bulletin | Sep 2, 2026 | This bulletin provides information when the yellow electrical system warning lamp is illuminated; DTC B1581F4, B168A00. |
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 Circ 91FN_REV1 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 Circ 91FN_REV1 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 Circ 91FN_REV1 cover?
The manufacturer filed it against 2 model years: 2023 Audi Q4 e-tron, 2022 Audi Q4 e-tron. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.