Mercedes-Benz bulletin NCU-2023120004
What it saysMercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2023 GLC (254 platform) vehicles, the panoramic sliding sunroof control unit software does not correspond… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Dec 14, 2023, received Jan 3, 2024, about the structure. It names 2 model years (2023–2024). 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 communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2023 GLC (254 platform) vehicles, the panoramic sliding sunroof control unit software does not correspond to the latest series production configuration. In rare cases, the sensitivity of the automatic reversing function may prompt an incorrect reversal of the sliding sunroof panel. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the Panoramic Sliding Sunroof Control Unit software.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| NCU-2023120004 | Service bulletin | Dec 14, 2023 | 10248167 | not found |
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 2 model years this bulletin names have filed 95 complaints with NHTSA since 2015.
The rear lift gate closes unexpectedly when standing behind the vehicle and loading or unloading the cargo area. The keyless soft close activates even though there is no foot movement, or when there is minimal movement. This happens without warning. On several occasions this has happened to me, and also to my wife.
2024 Mercedes-Benz GLC-Class · Structure · filed with NHTSA Jul 8, 2026 · ODI 11749171
The rear door randomly closes with force unexpectantly. We contacted the Mercedes dealer where the car was purchased and is serviced. They responded it can not be fixed and was an ongoing concern of many owners
2023 Mercedes-Benz GLC-Class · Structure · filed with NHTSA Jun 3, 2025 · ODI 11664589
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 group18 other manufacturer communications filed against the Mercedes-Benz GLC-Class under the same component group (structure), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI82.62-P-078631 | Service bulletin | Sep 14, 2026 | Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all rem… |
| LI72.20-P-075746 | Service bulletin | Aug 24, 2026 | Complaint Tailgate opens unintentionally. Cause Accidental or unnoticed activation of the button to open the tailgate on the vehicle key. EX… |
| PSL-NCU Return Parts 7/3 | Other | Jul 3, 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… |
| NCU - 2025120004 | Service campaign | Jan 10, 2026 | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the rear tailgate may not mee… |
| LI88.60-P-079592 | Service bulletin | Jul 31, 2025 | Complaint Fuel filler flap/socket flap sticks, cannot be opened Cause Under analysis. Remedy Create TIPS case with fault description and vid… |
| LI68.50-P-079347 | Service bulletin | May 29, 2025 | Complaint Load compartment cover generates a creaking noise during driving when pulled out to covering position. Cause Aluminum cassette scr… |
| LI72.00-P-073141 | Service bulletin | Mar 11, 2025 | Complaint Paint damage on door paneling in area of door handle (see picture 1). Cause Possible tolerance complaint regarding the door handle… |
| LI88.60-P-072093 | Service bulletin | Jan 24, 2025 | Complaint Fuel door may require several attempts to open. Please note that if the complaint "Fuel filler flap not opening" occurs, it is imp… |
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 NCU-2023120004 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 NCU-2023120004 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 NCU-2023120004 cover?
The manufacturer filed it against 2 model years: 2024 Mercedes-Benz GLC-Class, 2023 Mercedes-Benz GLC-Class. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.