Mercedes-Benz bulletin LI35.31-P-077429
What it saysInstrument cluster message "4MATIC inoperative". NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Oct 29, 2025, received May 31, 2024, about the power train — 3 documents under this number. It names 24 model years (2019–2026). 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 communicationInstrument cluster message "4MATIC inoperative". The following fault code may be present in all-wheel drive control unit N15/17: P147354 - Erroneous adaptation of the transfer case. The calibration is missing. P14759A - The coupling of the transfer case has malfunctioned. The operating conditions for the component or the system have not been fulfilled. Coupling of the rear axle differential has reached the wear limit or a coupling defect is present. Remedy Please read off the installed part number of the rear axle differential. For model designations (flat model series and not AMG 35 variants) 118345; 118347; 118613; 118615; 118647; 177013; 177015; 177045; 177047; 177145; 177147; 177188; 177945; 247013; 247045; 247047, the following applies: • If part number A2473502702 is not installed, the coupling package can be replaced. To this end, a repair kit has been added as a replacement part. • If part number A2473502702 is installed, the installation of the coupling package repair kit is not permissible and the rear axle differential should be replaced. For model designations (high model series and AMG 35 variants) 177151; 177051; 118351; 118651; 177951, the following applies: • If one of the part numbers A2473502702; A2473502503; A2473504504 has not been installed, the coupling package can be replaced. To this end, a repair kit has been added as a replacement part. • If one of the part numbers A2473502702; A2473502503; A2473504504 has been installed, the installation of the coupling package repair kit is not permissible and the rear axle differential should be replaced.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI35.31-P-077429 | Service bulletin | Oct 29, 2025 | 11024632 | PDF, 283 KB |
| LI35.31-P-077429 | Service bulletin | Jul 10, 2024 | 11005288 | PDF, 38 KB |
| LI35.31-P-077429 | Service bulletin | May 7, 2024 | 11000596 | PDF, 41 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 247 350 90 04 | MULTIPLATE CLUTCH RE-PAIR KIT | — | 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.
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 24 model years this bulletin names have filed 316 complaints with NHTSA since 2015. 19 of them name Power Train — 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.
Extended warrenty information mercedez benz has issued warrenty to that applie to condistions as listed above (exhaust valve, cyliner head ) back 08/04/2023 the car has in mercedez benz and have failed to pick on the extended warrrenty repairs and we now find out this cased more damage to the engine and needs to replace camshat and…
2020 Mercedes-Benz GLB-Class · Power Train · filed with NHTSA Jun 15, 2026 · ODI 11744345
The contact owns a 2021 Mercedes-Benz AMG GLB35. The contact stated that while reversing down the driveway at approximately 4 MPH, the contact turned the steering wheel to the left and the vehicle started losing motive power. The contact stated that the RPMs were extremely high and the vehicle almost stalled.
2021 Mercedes-Benz GLB-Class · Power Train · filed with NHTSA Jun 18, 2025 · ODI 11667631
The drivetrain/shaft is causing rumbling in the vehicle when accelerating and decelerating, typically around highway speeds. after more investigation the parts used on the a220 were also used on the gle350 that were recalled for having the same issues however the a220 wasn’t recalled for those issues
2020 Mercedes-Benz A-Class · Power Train · filed with NHTSA Jul 1, 2025 · ODI 11670557
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 power train
Source: same model, same component group11 other manufacturer communications filed against these Mercedes-Benz models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI 27.10-P-080851 | Service bulletin | Aug 29, 2026 | Complaint Intermittent shift feel or thud/clunk noise perceived, such as a brief jerk or transmission reaction during certain driving situat… |
| LI27.19-P-080823 | Service bulletin | Aug 25, 2026 | Complaint Customers may report one or more of the following: • Transmission malfunction message • Check engine light illuminated • Shifts in… |
| PSL-NCU Return Parts 8/21 | Other | Aug 21, 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… |
| LI35.30-P-058566 | Service bulletin | Jul 14, 2026 | Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The noise is heard once… |
| LI35.31-P-074854 | Service bulletin | Jan 23, 2026 | Complaint Noises from the rear axle differential, particularly when cornering slowly Cause Small quantity of water entering into oil of mult… |
| LI27.19-P-080155 | Service bulletin | Dec 19, 2025 | Complaint Oil residue in connector of transmission control unit in dual-clutch transmission models 724.0 and 724.1. Cause As part of the pro… |
| LI33.30-P-056665 | Service bulletin | Nov 15, 2025 | Complaint Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). The clunk is heard once… |
| LI27.19-P-072588 | Service bulletin | Sep 17, 2025 | Complaint Transmission control unit Y3/8n4 (fully integrated transmission control unit (VGS)) not listed in quick test and/or no communicati… |
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 LI35.31-P-077429 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 LI35.31-P-077429 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 LI35.31-P-077429 cover?
The manufacturer filed it against 24 model years: 2022 Mercedes-Benz A-Class, 2021 Mercedes-Benz A-Class, 2020 Mercedes-Benz A-Class, 2019 Mercedes-Benz A-Class, 2026 Mercedes-Benz CLA-Class, 2025 Mercedes-Benz CLA-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.