Mercedes-Benz bulletin LI80.20-N-079697
What it saysAcoustic Warning or message occurring when a closed sliding door is not recognized Complaint Customer may state the warning message or indicator accompanied by acoustic tone alerting the sliding door is ajar when… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jun 8, 2026, received Jul 2, 2026, about the structure. It names 15 model years (2016–2025). 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 communicationAcoustic Warning or message occurring when a closed sliding door is not recognized Complaint Customer may state the warning message or indicator accompanied by acoustic tone alerting the sliding door is ajar when the door is completely closed Cause There are several reasons that lead to the failure occurring: - Mechanical damage through bending when loading and unloading - Worn contact plates --> After detachment of silver plating, the coper plate is corroded - Movement of sliding door/body when driving --> Contact pins do not always make contact with contact plate --> Central locking system fault message in instrument cluster Remedy In a problem case, replace contact switch for vehicles with +T50/+T55/+EL9 or contact plate with A4478201903. Remember to check the fit of the sliding doors and make any necessary adjustments as per AR72.16-S-1023E (447/448) and AR72.16-D-1023TS (907/910). Further valid damage codes: 82326 Contact switch for central locking system on sliding door 82347 Contact plate for central locking system on sliding door 53196 K/Z contact plate for central locking system on sliding door 82645 Contact switch for sliding door
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI80.20-N-079697 | Service bulletin | Jun 8, 2026 | 11034417 | PDF, 1,438 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A4478201903 | — | — |
Read by machine from the document NHTSA serves (4 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.
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.
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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 15 model years this bulletin names have filed 601 complaints with NHTSA since 2015. 1 of them name 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 was driving and the vehicle began to smoke through the air conditioning vent and within 30 seconds flames of fire entered the vehicle and the vehicle was completely burned. I never received any recall regarding that malfunction and never saw any signal that this would happen. I almost caught in fire due to the imminent flames.
2019 Mercedes-Benz Sprinter · Structure · filed with NHTSA May 19, 2025 · ODI 11661916
The contact owns a 2020 Mercedes Benz Sprinter 4500. The contact received notification of NHTSA Campaign Number: 22V695000 (Structure, Equipment) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair.
2020 Mercedes-Benz Sprinter · Structure · filed with NHTSA Jul 29, 2024 · ODI 11605158
Mirrors are very narrow/poor, cant see in a cargo van, I almost killed someone or kill myself
2016 Mercedes-Benz Metris · Structure · filed with NHTSA Oct 11, 2016 · ODI 10915173
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 structure
Source: same model, same component group5 other manufacturer communications filed against these Mercedes-Benz models under the same component group (structure), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI91-18-N-080032 | Service bulletin | Apr 9, 2026 | Complaint Crease formation on genuine leather seat covers in vehicles with low mileage Cause • objects left on the seats for extended period… |
| LI88.30-N-078036_2 | Service bulletin | Nov 13, 2025 | Electric Step will not extend/inoperative Complaint T57 Electric step inop with warning on cluster. Cause Possible damage to end position se… |
| 2025020011 | Service campaign | Feb 28, 2025 | Mercedes-Benz AG, the manufacturer of Mercedes-Benz Metris Vans, has determined that the weld nuts on the longitudinal member were not insta… |
| LI72.10-N-077998 | Service bulletin | Jul 5, 2024 | Complaint Front door collides with fender. Cause Excessive dynamic stress results in permanent deformation of the lower hinge and causes the… |
| LI72.10-N-071190 | Service bulletin | May 8, 2024 | Complaint: Front door collides with fender. Excessive dynamic stress results in permanent deformation of the lower hinge and causes the fro… |
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 LI80.20-N-079697 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 LI80.20-N-079697 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 LI80.20-N-079697 cover?
The manufacturer filed it against 15 model years: 2023 Mercedes-Benz Metris, 2022 Mercedes-Benz Metris, 2021 Mercedes-Benz Metris, 2020 Mercedes-Benz Metris, 2019 Mercedes-Benz Metris, 2018 Mercedes-Benz Metris and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.