Mercedes-Benz bulletin LI77.21-P-079102
What it saysComplaint Creaking or ticking noise during driving operation - in particular in the event of stronger body stimuli such as on rough roads - from the left and/or right rear area (near the roller sunblind bearings)… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Apr 21, 2025, received Apr 24, 2025, about the structure. It names 2 model years (2024–2025). 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 Creaking or ticking noise during driving operation - in particular in the event of stronger body stimuli such as on rough roads - from the left and/or right rear area (near the roller sunblind bearings) of the panoramic roof frame. Cause Relative movement of the contact areas of the rear crossmember to the side metal component parts of the panoramic roof frame (picture_1) Remedy 1. Loosen roller sunblind of panoramic roof; to do so process operation steps 1 up to and including 12 in AR77.21- P-0215MEC; removal of the wind deflector (operation step 2) is not required 2. Slide roller sunblind of panoramic roof slightly forward and expose crossmember on left (picture_2) and right (picture_3) 3. Carefully enlarge gap between crossmember and side metal component part of the panoramic roof frame with a wedge (picture_4) 4. Press Teroson PU6700 or 6800 (adhesive/seam seal) into the gap (picture_5) 5. Spread adhesive/seam seal to prevent contact with the roller blind material (picture_6) 6. Repeat point 3 to 5 on the other side 7. Installation of roller sunblind of panoramic roof in the reverse order
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI77.21-P-079102 | Service bulletin | Apr 21, 2025 | 11017205 | PDF, 1,820 KB |
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 2 model years this bulletin names have filed 89 complaints with NHTSA since 2015.
I manually opened the power lift gate of my 2024 Mercedes-Benz GLE 450. While loading items into the rear of the SUV, the power lift gate closed autonomously and without warning, striking me on the right side of my face and neck. No hands-free gesture was made.
2024 Mercedes-Benz GLE-Class · Structure · filed with NHTSA May 14, 2026 · ODI 11737948
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 group14 other manufacturer communications filed against the Mercedes-Benz GLE-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… |
| LI88.60-P-079003 | Service bulletin | Aug 4, 2026 | Complaint • Fuel filler flap protrudes from side wall • Fuel filler flap not opening Cause Under analysis Remedy Create TIPS case with the b… |
| PSL-NCU Return Parts 5/22 | Other | May 22, 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… |
| LI54.71-P-080180 | Service bulletin | Mar 24, 2026 | Complaint Frequent rear view camera flap actuations and/or noise associated. NOTE: Rear view camera functions are NOT affected and still per… |
| 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… |
| NCU - 2025070004 | Service campaign | Jul 25, 2025 | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, a bracket on the underbody of… |
| 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… |
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 LI77.21-P-079102 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 LI77.21-P-079102 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 LI77.21-P-079102 cover?
The manufacturer filed it against 2 model years: 2025 Mercedes-Benz GLE-Class, 2024 Mercedes-Benz GLE-Class. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.