Audi bulletin AOS-26-09
What it saysThis is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A software fix is needed to correct the test plan: P275300 Transmission Fluid… NHTSA’s full summary ↓
Audi filed this with NHTSA as a service bulletin dated Feb 23, 2026, received Mar 3, 2026, about the power train. It names 2 model years (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 communicationThis is a notice for software changes with the ODIS diagnostic program to correct the communication during vehicle programming function: A software fix is needed to correct the test plan: P275300 Transmission Fluid Cooler Circuit/Open fault stored with no relevant Test Plan populated.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| AOS-26-09 | Service bulletin | Feb 23, 2026 | 11029359 |
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 16 complaints with NHTSA since 2015.
Audi Rumble is present on this vehicle, Audi disregards it even after visiting the dealer many times over the issue. Center diff is what is causing it. No issue up to 30k miles, then the rumble started. I am afraid of the drivetrain breaking and locking up during driving which could be catastrophic.
2023 Audi Q7 · Power Train · filed with NHTSA Nov 4, 2025 · ODI 11697332
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 power train
Source: same model, same component group27 other manufacturer communications filed against these Audi models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Audi list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| TSB_2074808_4 | Service bulletin | May 6, 2026 | The high-voltage batteries in electric vehicles are subject to various ageing effects which could lead to the energy content… |
| TSB_2070349_6 | Service bulletin | Mar 24, 2026 | This bulleitn provides informiaotn when there is a loss of coolant; mechanical coolant pump 2.9L, 3.0L V6 TFSI. |
| TSB_2074808_3 | Service bulletin | Dec 11, 2025 | This bulletin provides additoinal information to assist in determining the energy content of lithium-ion high-voltage batteries. |
| TSB_2070913_2 | Service bulletin | Aug 1, 2025 | This bulletin provides informaiotn when there are noises from steering and/or intermediate steering shaft. |
| TSB_2060560_4 | Service bulletin | Jul 30, 2025 | This bulletin providesi nformation when various DTCs are stored; high maximum temperature recorded for clutch K1. |
| TSB_2074857_2 | Service bulletin | Jun 20, 2025 | This bulletin provides information when there are noises/vibrations in tight bends; Q7 and A8 models. |
| TSB_2073034_8 | Service bulletin | Mar 12, 2025 | This bulletin provides informaion when there is an air suspension system fault, DTC C118D01, Compressor for level control electicalerror. |
| TSB-2073034_7 | Service bulletin | Feb 21, 2025 | This bulletin provides informaion when there is an air suspension system fault, DTC C118D01, Compressor for level control electicalerror. |
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 AOS-26-09 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 AOS-26-09 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 AOS-26-09 cover?
The manufacturer filed it against 2 model years: 2023 Audi Q7, 2023 Audi SQ7. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.