Audi bulletin A4524402072977_2
What it saysThis bulletin provides information when the ABS/ESC control unit cannot be reached, DTC U012100, ABS Control Module not communication. NHTSA’s full summary ↓
Audi filed this with NHTSA as a service bulletin dated Mar 22, 2024, received Apr 4, 2024, about the electronic stability control. It names 6 model years (2020–2024). 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 provides information when the ABS/ESC control unit cannot be reached, DTC U012100, ABS Control Module not communication.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A4524402072977_2 | Service bulletin | Mar 22, 2024 | 10252097 | PDF, 371 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 4KE909059N | — | — | |
| 4KE909059G | — | — |
Read by machine from the document NHTSA serves (3 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 control module for the 2024 Q8 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 6 model years this bulletin names have filed 97 complaints with NHTSA since 2015. 17 of them name Service Brakes — 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.
On XXX, I experienced a sudden, potentially catastrophic failure of multiple critical safety systems in my Audi Q8 e-tron while traveling southbound on near , at approximately 70 mph in heavy traffic. Without warning, the vehicle began beeping and displayed malfunction warnings for both the braking system and emergency braking system.
2024 Audi Q8 e-tron · Service Brakes · filed with NHTSA Oct 23, 2026 · ODI 11773230
When driving, my vehicle recieved multple warning messages at the same time. The first message was that my brake was malfunctioning, and when I went to brake, the brakes did not work. Thankfully, I wasn't going too fast when this happened and I was able to bring it down to a slow and turned into a lot.
2023 Audi e-tron · Service Brakes · filed with NHTSA Jun 5, 2026 · ODI 11742294
On five separate occasions across two separate drivers, we have experienced a partial brake failure in this vehicle. We strongly believe this to be a software defect and not a mechanical fault. On the e-Tron, the first portion of the brake pedal swing typically activates the regenerative braking.
2021 Audi e-tron · Service Brakes · filed with NHTSA Jan 31, 2025 · ODI 11639800
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 A4524402072977_2 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 A4524402072977_2 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 A4524402072977_2 cover?
The manufacturer filed it against 6 model years: 2024 Audi Q8 e-tron, 2024 Audi SQ8 e-tron, 2023 Audi e-tron, 2022 Audi e-tron, 2021 Audi e-tron, 2020 Audi e-tron. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.