Mercedes-Benz bulletin LI77.25-P-073749
What it saysComplaint Rear spoiler sporadically remains in opened position or does not extend and a fault message appears in the instrument cluster. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Nov 5, 2024, received Aug 2, 2023, about the structure — 4 documents under this number. It names 9 model years (2019–2024). 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 Rear spoiler sporadically remains in opened position or does not extend and a fault message appears in the instrument cluster. The rear spoiler can then no longer be retracted manually using the button. The function of the rear spoiler is re-established after an ignition reset and the fault message is no longer present in the instrument cluster. Cause Possible causes: • Coding of the AMG DRIVE UNIT for recognition of Hall sensor when retracting rear spoiler. • Hardware tolerances / hardware wear Remedy If new software for the AMG DRIVE UNIT is available, carry out the software update. If the vehicle already has the most current version of the AMG DRIVE UNIT software installed, conduct SCN coding of the AMG DRIVE UNIT. Software remedy: Up to YoM 19/2 -> AMG Drive Unit N145/1 Software A001 902 6208 As of YoM 20/1 up to YoM 20/2 -> AMG Drive Unit N145/1 Software A001 902 6108 As of YoM 21/1 -> AMG Drive Unit N145/1 Software A001 902 6008 Then check the currently learned actual values under the path "DRVU -> Actual values -> Rear wing sensor system": Are the actual values all in the specified range (green): --> Subject the vehicle to a final inspection/test drive and, if the findings report is OK, hand it over to the customer. If the actual values are outside of the specified range (red) or final inspection is not OK: --> Initialize the rear spoiler (if necessary up to 5x) until all values are in the target range (green). If subsequently OK: -> Subject the vehicle to a final inspection/test drive and, if the findings report is OK, hand it over to the customer. If still not OK: -> Check screw connection of rear spoiler adjuster (see attachment 1) for tight seating. If screws loose: -> Bond loose screw (see following steps and attachment 3 to 5). 1. Unscrew screw with Torx TX25 screwdriver from the housing guide. 2. Dip screw in Loctite 603 (at least 3 threads) 3. Screw the screw back into the housing guide with 2 Nm torque. (IMPORTANT: Loctite 603 finger-tight after 8 minutes and cured after 24 hours) 4. Initialize rear spoiler after the curing time. 5. Subject the vehicle to a final inspection/test drive and, if the findings report is OK, hand it over to the customer. If screws tight: -> Create a TIPS case with the following information: 1. When exactly does the fault message appear (at which speed, when accelerating or braking, automatic mode, etc.)?
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI77.25-P-073749 | Service bulletin | Nov 5, 2024 | 11010445 | PDF, 1,298 KB |
| LI77.25-P-073749 | Service bulletin | Oct 24, 2023 | 10244733 | PDF, 1,258 KB |
| LI77.25-P-073749 | Service bulletin | Oct 12, 2023 | 10244734 | PDF, 41 KB |
| LI77.25-P-073749 | Service bulletin | Jul 13, 2023 | 10240171 | PDF, 41 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A001 902 6208 | — | — | |
| A001 902 6108 | — | — | |
| A001 902 6008 | — | — |
Read by machine from the document NHTSA serves (5 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.
Find the body for the 2024 AMG GT →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2020 Mercedes-Benz AMG GT43; 2022 Mercedes-Benz AMG GT63; 2022 Mercedes-Benz AMG GT63 S.
A 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 6 model years this bulletin names have filed 20 complaints with NHTSA since 2015. 6 of them name Electrical System — 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.
2023 MERCEDES GT 43 AMG, approximately one year old caught fire in the garage of our home. The car was off and sitting in the garage for approximately 10 hours prior to fire damaging the garage and parts of the house. This occurred at approximately on . There were 3 people in the house including .
2023 Mercedes-Benz AMG GT · Electrical System · filed with NHTSA Oct 23, 2024 · ODI 11621490
My 2021 Mercedes-Benz AMG GT 43, VIN , has had a recurring safety issue with the transmission wiring harness and connector X279. Mercedes-Benz said this connector can let water in, which can cause a short circuit, overheating, and a fire risk while the car is parked and off.
2021 Mercedes-Benz AMG GT · Electrical System · filed with NHTSA May 25, 2026 · ODI 11739859
I was driving my car on , 2024, on the highway when the car suddenly started to display many errors on the dashboard/cluster. Then, while moving, the gas pedal suddenly stopped working, and at the same time, all the electrical buttons and lights started flashing.
2022 Mercedes-Benz AMG GT · Electrical System · filed with NHTSA Jun 12, 2024 · ODI 11594068
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 group20 other manufacturer communications filed against these Mercedes-Benz models 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… |
| LI88.50-P-080263 | Service bulletin | Jul 1, 2026 | Complaint The trunk lid does not open or close completely and must be operated manually by the customer. The following fault codes are store… |
| LI67.30-P-078468 | Service bulletin | Jul 1, 2026 | Complaint Creaking/cracking sounds detectable in upper area of the side window panes Cause A locating rivet used during vehicle production t… |
| PSL-NCU Return Parts 6/26 | Other | Jun 26, 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 - 2026060002 | Service campaign | Jun 26, 2026 | Work procedure A 1. Replace longitudinal member panel at right and left. Does not apply to VIN W1KRJ4xxxxxx11347! Please send an email to yo… |
| LI88.20-P-080034 | Service bulletin | May 7, 2026 | Complaint Replacement rear lower carbon bumper cover is delivered without Parktronc (PTS) sensor holders. This is observed during part repla… |
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 LI77.25-P-073749 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 LI77.25-P-073749 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 LI77.25-P-073749 cover?
The manufacturer filed it against 9 model years: 2024 Mercedes-Benz AMG GT, 2023 Mercedes-Benz AMG GT, 2022 Mercedes-Benz AMG GT, 2021 Mercedes-Benz AMG GT, 2020 Mercedes-Benz AMG GT, 2019 Mercedes-Benz AMG GT and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.