Mercedes-Benz bulletin LI54.71-P-078112
What it saysComplaint The concern is characterized by BOTH of the following. 1. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Dec 11, 2025, received Sep 25, 2024, about the forward collision avoidance — 7 documents under this number. It names 10 model years (2016–2025). 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 The concern is characterized by BOTH of the following. 1. "Active Distance Assist currently unavailable" and "Active Brake Assist functions currently limited" are shown on the instrument cluster during startup or while driving AND 2. Stored DTC in quick test U0416FE - "Implausible data were received from control unit Traction system" in A108/1 (Distronic). Cause Missing wire between Drive Unit (N145) and Supercap (C8). Remedy Please reference the following attachments prior to starting work to familiarize and verify the locations of the components: • Drive Unit (N145) - See attachment "Location of Drive Unit in the vehicle". • Supercap (C8) - See attachment "Location of Supercap C8 in the vehicle". Professionally create a new connection by: • Using a red/white cable with cross-section 0.35 mm² and overall length of approximately 2m. • Connect Drive Unit (N145) plug A pin 18 to the 3-pin plug of the Supercap (C8) terminal 15 pin 2. Reference the new wire routing location as shown by the red line in "Picture 1 - Connection from Supercap to Drive Unit". • The new wire should be added to the existing wiring harness as shown by the red line "Picture 1 - Connection from Supercap to Drive Unit". • Z-Splice is the preferred method using A 000 982 91 10. • Crimp Contact Pin (MLK) for the Drive Unit (N145) is A0485450328. NOTE: All WIS instructions must be followed for wiring modifications. Damage code: 0 - 51422 - ** - 7 (for ** please state the following: "missing connection ex factory"). If the vehicle has had the modification completed and returns with an exact matching "complaint", please open a TIPS case.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI54.71-P-078112 | Service bulletin | Dec 11, 2025 | 11026593 | PDF, 4,246 KB |
| LI54.71-P-078112 | Service bulletin | Oct 29, 2025 | 11024620 | PDF, 4,246 KB |
| LI54.71-P-078112 | Service bulletin | Jul 11, 2025 | 11020698 | PDF, 4,246 KB |
| LI54.71-P-078112 | Service bulletin | Jul 8, 2025 | 11020643 | PDF, 4,246 KB |
| LI54.71-P-078112 | Service bulletin | Jun 17, 2025 | 11019639 | PDF, 4,246 KB |
| LI54.71-P-078112 | Service bulletin | Dec 19, 2024 | 11011982 | PDF, 35 KB |
| LI54.71-P-078112 | Service bulletin | Sep 18, 2024 | 11008006 | PDF, 10 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 000 982 91 10 | — | — | |
| A4638209600 | N145/1 Pin N145/1 Pin 1 X | — | eBay Motors → |
Read by machine from the document NHTSA serves (3 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.
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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 10 model years this bulletin names have filed 40 complaints with NHTSA since 2015. 12 of them name Electrical System, Forward Collision Avoidance, Service Brakes — 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.
The contact owns a 2019 Mercedes-Benz g550. The contact received notification of NHTSA campaign number: 20v090000 (power train, service brakes, hydraulic, electronic stability control) however, the part for the recall repair was unavailable. The contact stated the manufacturer exceeded a reasonable amount of time for the recall repair.
2019 Mercedes-Benz G-Class · Service Brakes · filed with NHTSA Apr 14, 2020 · ODI 11321127
Shortly after purchasing a new Mercedes Benz 2021 G550 on , the SUV started having electrical problems. During early 2022 the vehicle shut off while at a red light and would not restart until a few minutes later. No warning light or error message was seen and when taken to the dealership they could not find anything wrong.
2021 Mercedes-Benz G-Class · Electrical System · filed with NHTSA Jun 5, 2024 · ODI 11592609
Dear NHTSA Please consider this a formal complaint against Mercedes-Benz for completely defective ABS and EPS systems which control handling, dynamic stability, and anti-lock braking. The “Defective” designation is theirs, rather than a notice to service or that the systems were merely off-line or required repair.
2017 Mercedes-Benz G-Class · Service Brakes · filed with NHTSA May 27, 2021 · ODI 11418736
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.
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 LI54.71-P-078112 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 LI54.71-P-078112 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 LI54.71-P-078112 cover?
The manufacturer filed it against 10 model years: 2025 Mercedes-Benz G-Class, 2024 Mercedes-Benz G-Class, 2023 Mercedes-Benz G-Class, 2022 Mercedes-Benz G-Class, 2021 Mercedes-Benz G-Class, 2020 Mercedes-Benz G-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.