Mercedes-Benz bulletin LI82.35-P-079531
What it saysComplaint To prevent the wiper motor from overheating, the wipe frequency is reduced automatically when a dry windshield is detected. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Sep 3, 2025, received Sep 9, 2025, about the visibility/wiper. It names 12 model years (2020–2025). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationComplaint To prevent the wiper motor from overheating, the wipe frequency is reduced automatically when a dry windshield is detected. In specific situations under various independent ambient conditions, this detection could be activated by mistake, with the result that the wiper system switches from activated continuous operation to intermittent operation when it's raining. Cause Sensitive parameters for detecting dry conditions. The wiper system might switch back to intermittent operation even though it is raining and continuous wiping is activated. Remedy Install new wiper motor assembly. In the new wiper motor system, the parameters for detecting dry conditions have been optimized.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI82.35-P-079531 | Service bulletin | Sep 3, 2025 | 11023025 | PDF, 36 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A2478209203 | Wiper system parts kit 1 Left-hand drive vehicle X | — | eBay Motors → |
| A2478209303 | Wiper system parts kit 1 Right-hand drive vehicle X | — | 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.
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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 12 model years this bulletin names have filed 188 complaints with NHTSA since 2015. 3 of them name Visibility/Wiper — 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.
Driving on north bound of Merritt Parkway between exit 17 and 18. Today 12/10/25 9:28 AM My panoramic sunroof exploded ! all catch on video, driver on the vehicle behind me , came to check on me; and told me the glass went over four feet up in the air and then hit his vehicle windshield, I call Mercedes Benz customer service support to…
2021 Mercedes-Benz GLB-Class · Visibility/Wiper · filed with NHTSA Dec 10, 2025 · ODI 11704359
My 2020 Mercedes-Benz GLB has a serious, unresolved safety issue involving the hood-latch warning and windshield wipers. While I am driving, the hood-open warning appears and the windshield wipers cut in and out or shut off unexpectedly. This problem was already occurring by March 2026.
2020 Mercedes-Benz GLB-Class · Visibility/Wiper · filed with NHTSA Sep 14, 2026 · ODI 11764044
I was driving on Highway on May 19th and the Panoramic Sunroof suddenly shattered
2023 Mercedes-Benz GLB-Class · Visibility/Wiper · filed with NHTSA Sep 11, 2025 · ODI 11686651
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 visibility/wiper
Source: same model, same component group7 other manufacturer communications filed against these Mercedes-Benz models under the same component group (visibility/wiper), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PSL-NCU Return Parts 6/19 | Other | Jun 19, 2026 | Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be ret… |
| LI82.30-P-059239 | Service bulletin | May 19, 2026 | Complaint There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper blades squeaking, chatteri… |
| LI83.30-P-079850 | Service bulletin | Jan 16, 2026 | Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy *… |
| LI83.30-P-079081 | Service bulletin | Apr 21, 2025 | Complaint Random heating of air conditioning system. Cause Temperature sensor in overhead control panel (OCP) delivering incorrect values: T… |
| LI82.35-P-078467 | Service bulletin | Oct 23, 2024 | Complaint Washer fluid system leaks Cause Various possible causes: 1. Washer fluid reservoir itself. 2. Seal on washer fluid pump/washer flu… |
| LI83.10-P-077934 | Service bulletin | Jun 6, 2024 | Complaint Noise can be heard coming from the air conditioning system at higher blower motor speeds. Cause Leaves/foreign objects have entere… |
| LI83.10-P-075602 | Service bulletin | Jun 6, 2024 | Complaint Noise can be heard coming from the air conditioning system at higher blower motor speeds. Cause Leaves/foreign objects have entere… |
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 LI82.35-P-079531 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 LI82.35-P-079531 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 LI82.35-P-079531 cover?
The manufacturer filed it against 12 model years: 2025 Mercedes-Benz GLA-Class, 2024 Mercedes-Benz GLA-Class, 2023 Mercedes-Benz GLA-Class, 2022 Mercedes-Benz GLA-Class, 2021 Mercedes-Benz GLA-Class, 2020 Mercedes-Benz GLA-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.