Mercedes-Benz bulletin LI91.29-P-078588
What it saysComplaint One or more of the seats in the second or third row cannot be folded over when the switch group in the trunk is used. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Nov 16, 2024, received Nov 19, 2024, about the seats. It names 5 model years (2020–2024). 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 communicationComplaint One or more of the seats in the second or third row cannot be folded over when the switch group in the trunk is used. Cause Under analysis. Remedy Please thoroughly check the physical layer such as operating switches, lines, and pins to make sure that they are not the reason for the fault. Verify the switches are showing correct actual values with the Xentry. Verify the seats fold properly when using other switches. After this, create a TIPS case and attach a control unit log for the corresponding control unit along with a CAN trace from the body CAN that documents the problem.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI91.29-P-078588 | Service bulletin | Nov 16, 2024 | 11010652 | PDF, 35 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.
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 5 model years this bulletin names have filed 123 complaints with NHTSA since 2015. 2 of them name Seats — 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.
girl went in back passenger door (rear facing car seat present), crouched under seat area to climb to middle seat when brother push button and seat moved forward without stopping crushing old head between back of seat and back of Car seat. There was no safety stop, was stuck mother has to press button to move seat back to release head
2024 Mercedes-Benz GLS-Class · Seats · filed with NHTSA Jun 9, 2026 · ODI 11743087
On , I was heading home from work traveling on through Atlanta's usual heavy traffic. I smelled smoke inside my car and saw fire flames coming from under my passenger seat. My initial reaction was to try to put the fire out with my hat without burning myself.
2021 Mercedes-Benz GLS-Class · Seats · filed with NHTSA May 16, 2025 · ODI 11661377
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 seats
Source: same model, same component group3 other manufacturer communications filed against the Mercedes-Benz GLS-Class under the same component group (seats), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI91.10-P-078305 | Service bulletin | Mar 26, 2026 | Complaint The "easy entry and exit feature" function deactivates itself after a brief period. (see attachment) Cause The cause is currently… |
| LI91.12-P-073742 | Service bulletin | Jun 27, 2024 | Complaint • Seats cannot be adjusted • Seats cannot be folded • Seats in the 2nd seat row cannot be locked or unlocked • Normalization canno… |
| LI91.18-P-077075 | Service bulletin | Dec 4, 2023 | Crease formation on genuine leather seat covers in vehicles with low mileage ⢠Objects left on the seats for extended periods of time… |
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 LI91.29-P-078588 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 LI91.29-P-078588 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 LI91.29-P-078588 cover?
The manufacturer filed it against 5 model years: 2024 Mercedes-Benz GLS-Class, 2023 Mercedes-Benz GLS-Class, 2022 Mercedes-Benz GLS-Class, 2021 Mercedes-Benz GLS-Class, 2020 Mercedes-Benz GLS-Class. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.