Mercedes-Benz bulletin LI61.20-P-077105
What it saysComplaint Cracking/clicking noise from underbody when driving slowly (around curves); see attachment. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Sep 3, 2025, received Dec 5, 2023, about the structure — 5 documents under this number. It names 12 model years (2020–2025). 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 Cracking/clicking noise from underbody when driving slowly (around curves); see attachment. Cause Potential causes: • Assembly of the underfloor paneling with unloaded body (results in tension after compression of vehicle in K0- design level) • Relative movement between front and rear engine compartment lining • Torque loss of the screw connection • Accumulation of stones and dirt Remedy Changes Made: • Screw connection in K0-design level (vehicle compressed - on ground at ride height) and taking into account the correct screw sequence • Additional screw connection points (minimization of relative movement) • Use of rivet nuts and screws with a larger diameter • Integration of spacer rings (reduction of accumulation of stones and dirt) Note: In order to rule out that other component parts may be responsible for the noise, remove the underfloor paneling first. If the noise complaint is NOT present after removal, proceed with underfloor paneling rework. Underfloor paneling rework 1. Order after-sales kit with item number A2326207003 for the rework. 2. After receiving the after-sales kit (A2326207003), check the contents: 22 screws (A0109902604) / 14 rivet nuts (A0009902349) / 4 spacer washers (A2326207203). If the content is complete, start rework in the next step. 3. Disassemble underfloor paneling. If front and rear engine compartment lining are bonded to one another, order new parts (A2326201101, A2326268900). 4. Clean underfloor paneling and integral carrier. Failure to clean the parts can lead to noise once re-assembled. 5. Mark four additional screw connection points on the front engine compartment lining (see attachment 1). See appendix 2 for dimensions. 6. Drill holes with d=9 mm on the markings. 7. Screw front and rear engine compartment lining together using the screw connection points already available (see attachment 3). Both linings are therefore aligned to one another. Important: Pay attention to alignment of the elongated holes on the external edges. 8. Drill into the rear engine compartment lining using the four additional holes with d=9 mm (see attachment 4). 9. Disassemble front and rear engine compartment lining. 10. Drill out three existing rivet nuts with d=9 mm (see attachment 5). 11. Insert seven new rivet nuts (A0009902349) (see attachment 6). 12. Drill out seven existing rivet nuts in the integral carrier with d=9 mm (see att
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI61.20-P-077105 | Service bulletin | Sep 3, 2025 | 11022910 | PDF, 681 KB |
| LI61.20-P-077105 | Service bulletin | May 22, 2025 | 11018588 | PDF, 681 KB |
| LI61.20-P-077105 | Service bulletin | Apr 21, 2025 | 11017204 | PDF, 681 KB |
| LI61.20-P-077105 | Service bulletin | Mar 10, 2025 | 11015559 | PDF, 678 KB |
| LI61.20-P-077105 | Service bulletin | Nov 14, 2023 | 10246049 | PDF, 134 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A2326207003 | — | — | |
| A0109902604 | — | — |
Read by machine from the document NHTSA serves (7 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 themAlso filed against model years this site has no page for: 2024 Mercedes-Benz AMG GT53E; 2024 Mercedes-Benz AMG GT63 S E; 2022 Mercedes-Benz AMG SL43; 2024 Mercedes-Benz AMG SL53E; 2024 Mercedes-Benz AMG SL63 S E.
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 7 model years this bulletin names have filed 14 complaints with NHTSA since 2015.
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 group24 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 LI61.20-P-077105 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 LI61.20-P-077105 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 LI61.20-P-077105 cover?
The manufacturer filed it against 12 model years: 2025 Mercedes-Benz AMG GT, 2024 Mercedes-Benz AMG GT, 2025 Mercedes-Benz SL-Class, 2024 Mercedes-Benz SL-Class, 2023 Mercedes-Benz SL-Class, 2022 Mercedes-Benz SL-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.