Mercedes-Benz bulletin PSL-NCU Return Parts 5/29
What it saysDear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a manufacturer communication dated May 30, 2026, received Jun 2, 2026, about the service brakes. It names 16 model years (2020–2026). A manufacturer communication 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 communicationDear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be returned to your facing PDC. The deadline for all dealer returns is no later than Thursday, June 18, 2026. After June 18th, returns of these parts will no longer be accepted. These parts should be returned via ZSR Special Return, using item category SCM Authorized Part Return. Please include a copy of this NCU as your authorization to return these parts. This procedure will not affect your return allowance. All returned parts will be replaced in accordance with the chart provided below.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| PSL-NCU Return Parts 5/29 | Other | May 30, 2026 | 11033109 | PDF, 99 KB |
What the document itself lists
The manufacturer titles it “Notice to Return Parts DATE: May 29, 2026”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A4656904700 | — | — | |
| A4656907202 | — | — | |
| A2235017200 | — | — | |
| A2235016703 | — | — | |
| A2143523700 | — | — | |
| A2143505506 | — | — |
Read by machine from the document NHTSA serves (1 page), read Sep 30, 2026. A part number is shown only where it matches Mercedes-Benz’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 body for the 2026 E-Class →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 themAlso filed against model years this site has no page for: 2024 Mercedes-Benz AMG S 63 E 4MATIC+; 2026 Mercedes-Benz AMG S 63 E 4MATIC+; 2026 Mercedes-Benz E53 E 4MATIC+ ALL-Terrain.
A 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 195 complaints with NHTSA since 2015. 7 of them name Service Brakes, Structure — 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.
I am writing to formally log an urgent Safety-Critical Incident Report regarding a complete brake system failure on my 2022 Mercedes-Benz GLS450 (VIN: ). Incident Details: Date & Time：［XXX］ Vehicle Mileage: Approximate 30k miles Occupants: 5 family members (including 3 children) Maintenance History: Fully and regularly maintained…
2022 Mercedes-Benz GLS-Class · Service Brakes · filed with NHTSA Sep 14, 2026 · ODI 11763973
There have been 3 incidents where the car responded to unknown stimuli by braking hard. 3 months ago it happened while making a left turn through an intersection, driving about 10 mph the brakes unexpectedly locked up, luckily the person behind me took evasive action and didn't hit me; 2 weeks later it happened again, I was driving on…
2023 Mercedes-Benz GLS-Class · Service Brakes · filed with NHTSA Oct 2, 2024 · ODI 11617794
Mercedes-Benz E350 Mild Hybrid was purchased new on XXX. Vehicle had approximately 291 miles and had been owned 25 days, when incident occurred on XXX at approximately 9:30am. Incident occurred during normal interstate driving (I-10 between and ) at approximately the posted speed limit of 60mph. Weather was partly cloudy, not raining.
2026 Mercedes-Benz E-Class · Structure · filed with NHTSA Jul 16, 2026 · ODI 11750962
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 service brakes
Source: same model, same component group6 other manufacturer communications filed against these Mercedes-Benz models under the same component group (service brakes), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI42.10-P-078779 | Service bulletin | Sep 22, 2026 | Complaint Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is similar to a tire or wheel vib… |
| LI42.10-P-080253 | Service bulletin | Sep 1, 2026 | Complaint When coming to a stop or at slow speeds, brakes produce light squealing noise. Cause Optimized brake pads may produce some noise a… |
| LI42.10-P-063502 | Service bulletin | Sep 1, 2026 | Complaint Noises/ squealing from the service brake in various driving situations and ambient conditions. Cause Frictional vibrations Remedy… |
| EW - Pressure Trans M157 | Warranty extension | Mar 13, 2026 | In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Merce… |
| LI42.10-P-079904 | Service bulletin | Oct 20, 2025 | Complaint At low speeds and light brake pressure, brakes will make a groaning or honking noise. Cause Frictional vibrations with very light… |
| NCU-2023040017 | Service bulletin | May 19, 2023 | Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2022-2023 C-Class, EQS and S-Class… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mercedes-Benz, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mercedes-Benz PSL-NCU Return Parts 5/29 a recall?
No. A manufacturer communication 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 PSL-NCU Return Parts 5/29 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 Mercedes-Benz warranty extension on file lists the ones Mercedes-Benz has filed.
Which vehicles does PSL-NCU Return Parts 5/29 cover?
The manufacturer filed it against 16 model years: 2026 Mercedes-Benz E-Class, 2025 Mercedes-Benz E-Class, 2024 Mercedes-Benz E-Class, 2022 Mercedes-Benz EQB, 2025 Mercedes-Benz G-Class, 2026 Mercedes-Benz GLS-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.