Mercedes-Benz bulletin LI46.80-P-078043
What it saysComplaint Message in the instrument cluster regarding rear axle steering In the short test, the fault > Actuator blocked < appears Cause Vehicle may detect high adjustment force in the rear axle steering. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jan 8, 2025, received Jul 31, 2024, about the steering — 3 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 Message in the instrument cluster regarding rear axle steering • In the short test, the fault > Actuator blocked < appears Cause Vehicle may detect high adjustment force in the rear axle steering. Remedy NOTE: If hardware and software numbers do not match exactly what is listed below, please follow DTC guided tests. Old Hardware: A 290 460 3300 / 3400 > SW A 290 902 7400 Caution! This hardware cannot be flashed with the new software version. Only the current hardware with the corresponding previous software release can be flashed. If the vehicle still has the old hardware installed, do not attempt to flash; instead, please create a TIPS case. Current Hardware: A 290 460 3900 / 4000 >> SW A 290 902 5101 This hardware can be flashed with A 290 902 1005. Flash control unit N68/3 and N68/4 with current software release A 290 902 1005 using XD.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI46.80-P-078043 | Service bulletin | Jan 8, 2025 | 11012800 | PDF, 36 KB |
| LI46.80-P-078043 | Service bulletin | Sep 21, 2024 | 11008007 | PDF, 10 KB |
| LI46.80-P-078043 | Service bulletin | Jul 30, 2024 | 11005348 | PDF, 36 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 290 902 1005 | — | — |
Read by machine from the document NHTSA serves (2 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.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2024 Mercedes-Benz AMG GT53E; 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. 7 of them name Electrical System, Steering — 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.
On July 27, 2026, while driving my 2019 Mercedes-Benz AMG GT 63 under normal conditions, the vehicle suddenly displayed a suspension warning stating, “Malfunction — Drive at Max. 50 mph.” The warning appeared while the vehicle was in motion; I had not received this suspension warning before the incident.
2019 Mercedes-Benz AMG GT · Suspension · filed with NHTSA Aug 24, 2026 · ODI 11759268
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
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 steering
Source: same model, same component group8 other manufacturer communications filed against these Mercedes-Benz models under the same component group (steering), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI46.10-P-080896 | Service bulletin | Sep 26, 2026 | Complaint Slight creaking noises when steering. Cause Noises may come from one or more sleeves of the horn contact plate. Remedy Remove the… |
| LI46.10-P-077314 | Service bulletin | Sep 25, 2026 | Complaint Noises in the steering column area when steering. See example file in the attachments area: "MRSM‑Schleifgeräusch_SCCMGrindingNois… |
| LI46.35-P-067339 | Service bulletin | Aug 28, 2026 | Complaint During part of the steering movement, it feels heavier or more difficult to steer in the same spot every time. OR Rattling, hummi… |
| LI46.10-P-079582 | Service bulletin | Aug 5, 2025 | Complaint Valeo Steering Column Module (N80) goes into bootloader after updating software to A2239028729. To verify the supplier and softwar… |
| LI46.15-P-063353 | Service bulletin | Jun 9, 2025 | Complaint Height adjustment of electric steering column adjustment jammed in the top/bottom adjustment position… |
| LI46.15-P-078766 | Service bulletin | Jan 8, 2025 | Complaint Play noticeable in the height adjustment of the steering column. See arrow direction in attached pictures. Cause Slipped thrust be… |
| LI46.10-P-077313 | Service bulletin | Jan 24, 2024 | The steering wheel generates grinding noises between the steering wheel and steering column switch module during steering maneuvers See ex… |
| LI46.35-P-077076 | Service bulletin | Dec 4, 2023 | Control unit N68 - electric power steering Fault P063544 - The electric power steering has a malfunction. There is a fault in the data memo… |
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 LI46.80-P-078043 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 LI46.80-P-078043 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 LI46.80-P-078043 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.