Mercedes-Benz bulletin LI42.15-P-079899
What it saysComplaint Brake squeal on the front axle at slow speed and before coming to a stop. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Oct 28, 2025, about the suspension. It names 8 model years (2018–2025). 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.
Get the next Mercedes-Benz GLC-Class bulletin by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationComplaint Brake squeal on the front axle at slow speed and before coming to a stop. Cause Frictional vibrations Remedy Install new brake linings with Part number A 000 421 7902.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI42.15-P-079899 | Service bulletin | Oct 28, 2025 | 11024506 | PDF, 36 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 000 421 7902 | WIS-References | — | eBay Motors → |
Read by machine from the document NHTSA serves (2 pages), 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.
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.
Email me new Mercedes-Benz bulletins for the GLC-Class
A weekly email, sent only in a week when Mercedes-Benz files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 8 model years this bulletin names have filed 530 complaints with NHTSA since 2015.
The suspension has malfunctioned on a car with only 89,000 miles. Upon starting the car, the vehicle says to please wait while it is rising. However, when I drive it, a red alert says to stop driving because it's too low to drive, and the car looks very low and lopsided.
2019 Mercedes-Benz GLC-Class · Suspension · filed with NHTSA Aug 17, 2026 · ODI 11757434
This 2021 Mercedes-Benz GLC 63 AMG has experienced repeated and escalating warranty defects involving engine performance, loss of acceleration, air suspension failure, and now inoperative advanced safety systems including blind spot and active brake assist.
2021 Mercedes-Benz GLC-Class · Suspension · filed with NHTSA Mar 18, 2026 · ODI 11725180
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 suspension
Source: same model, same component group9 other manufacturer communications filed against the Mercedes-Benz GLC-Class under the same component group (suspension), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI33.20-P-078406 | Service bulletin | Jul 8, 2026 | Complaint Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or Creaking/crackling… |
| LI40.10-P-061032 | Service bulletin | May 15, 2026 | Complaint Noises at the front axle when cornering or maneuvering (video files attached) Note: Save video files locally and play them with Wi… |
| LI32.25-P-079706 | Service bulletin | Jan 30, 2026 | Complaint: Clattering noise from area of hood with steel suspension. Cause: Missing helical spring shim… |
| LI46.80-P-080054 | Service bulletin | Dec 6, 2025 | Complaint An instrument cluster message "Rear axle steering fault, stop immediately" is very briefly illuminated in the instrument cluster u… |
| LI32.25-P-079707 | Service bulletin | Oct 27, 2025 | Complaint Wheezing noises/squeaking noises from the front shock absorbers when passing over surface undulations and rough road. Noise MUST m… |
| LI32.25-P-079708 | Service bulletin | Sep 4, 2025 | Complaint Metallic clattering/noise from the area of the dashboard on uneven roads Cause A loose upper metal plate in the head bearing… |
| LI46.35-P-076566 | Service bulletin | Mar 10, 2025 | Complaint A squeaking noise comes from the electric power steering; see video with example. Cause Toothed rack in the area of the screw driv… |
| LI32.25-P-076956 | Service bulletin | Oct 12, 2023 | Wheezing noises from the front shock absorbers when passing over surface undulations and rough road. The noises may become more conspicuous… |
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 LI42.15-P-079899 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 LI42.15-P-079899 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 LI42.15-P-079899 cover?
The manufacturer filed it against 8 model years: 2025 Mercedes-Benz GLC-Class, 2024 Mercedes-Benz GLC-Class, 2023 Mercedes-Benz GLC-Class, 2022 Mercedes-Benz GLC-Class, 2021 Mercedes-Benz GLC-Class, 2020 Mercedes-Benz GLC-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.