Mercedes-Benz bulletin LI83.30-P-079196
What it saysComplaint Yellow instrument cluster message: "Cooling system fault, operating energy input reduced, service required". NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Mar 12, 2026, received May 2, 2025, about the engine — 3 documents under this number. It names 11 model years (2022–2025). 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 Yellow instrument cluster message: "Cooling system fault, operating energy input reduced, service required". Cause Fault code "B3A0077 - The regulation valve in the refrigerant circuit for the battery cooling gets stuck open. The ordered position cannot be achieved" stored. Faulty expansion valve component part Y140/1 Remedy Check the part number of Y140/1. If the vehicle has A 297 830 79 03 or older, replace Y140/1 with A 297 830 89 03 or newer. Do not replace defective components with part number A 297 830 8903 and an expansion valve production date after February 1, 2025! Please create TIPS case, attach the current quick test and attach picture of the evaporator assembly component part label and a picture of the production date of the EXV Y140/1 (see exampled attached).
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI83.30-P-079196 | Service bulletin | Mar 12, 2026 | 11030093 | PDF, 841 KB |
| LI83.30-P-079196 | Service bulletin | Oct 27, 2025 | 11024516 | PDF, 841 KB |
| LI83.30-P-079196 | Service bulletin | Apr 29, 2025 | 11017493 | PDF, 841 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 297 830 79 03 | — | — | |
| A 297 830 89 03 | — | — |
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 themAlso filed against model years this site has no page for: 2024 Mercedes-Benz Redundant EQE 350; 2023 Mercedes-Benz Redundant EQE 350 4MATIC; 2023 Mercedes-Benz Redundant EQS 450; 2024 Mercedes-Benz Redundant EQS 450.
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 187 complaints with NHTSA since 2015. 6 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.
The center console display (MBUX) on this 2023 EQS 450 4MATIC fails while the vehicle is in use. There is no warning lamp, chime or message first. Sometimes it flickers on and off; other times it goes fully blank and stays blank, unresponsive to touch. Owner video shows the display working and then completely blank 0.4 seconds later.
2023 Mercedes-Benz EQS · Visibility/Wiper · filed with NHTSA Sep 5, 2026 · ODI 11762332
Complete loss of drive power while driving 25-50 mph on Vehicle was able to coast slowly to a stop on the shoulder Multiple warnings including INOPERABLE Restarted vehicle several times, powered off vehicle for 10-30 mins, ultimately needed tow to dealership Extremely dangerous situation if it were to happen on a highway
2025 Mercedes-Benz EQS · Power Train · filed with NHTSA Sep 8, 2025 · ODI 11685737
The contact owns a 2024 Mercedes-Benz EQE 350+. The contact stated that while her husband was driving at 75 MPH, the panoramic sunroof suddenly shattered without warning, producing a loud booming sound. The contact's husband pulled over and inspected the vehicle before driving back to the residence.
2024 Mercedes-Benz EQE · Visibility/Wiper · filed with NHTSA Jul 6, 2026 · ODI 11748503
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 engine
Source: same model, same component group2 other manufacturer communications filed against these Mercedes-Benz models under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI08.10-P-079423 | Service bulletin | Jun 12, 2025 | Complaint Reduced Drive Power' warning displayed on Instrument Cluster, as Illustrated in the Picture, but no relevant fault codes are prese… |
| NCU - 2024020011 | Service bulletin | Mar 15, 2024 | This is to notify you of the Service Campaign Launch to install preservation wax on the inside of the integral carrier on 3,638 Model Year… |
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 LI83.30-P-079196 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 LI83.30-P-079196 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 LI83.30-P-079196 cover?
The manufacturer filed it against 11 model years: 2025 Mercedes-Benz EQE, 2024 Mercedes-Benz EQE, 2023 Mercedes-Benz EQE, 2025 Mercedes-Benz EQS, 2024 Mercedes-Benz EQS, 2023 Mercedes-Benz EQS and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.