Mercedes-Benz bulletin LI83.70-P-078292
What it saysComplaint Red warning message in instrument cluster: "Towing not allowed, see Operator's Manual, consult workshop without starting the engine again". NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jun 16, 2026, received Aug 30, 2024, about the visibility/wiper — 3 documents under this number. It names 13 model years (2022–2026). 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 communicationComplaint Red warning message in instrument cluster: "Towing not allowed, see Operator's Manual, consult workshop without starting the engine again". Cause Missing diaphragm on high voltage PTC (interior heating) N33/14 component part results in moisture buildup in the installation space for the heater and causes an insulation fault. The entry of moisture into the high voltage PTC (interior heating) N33/14 in the high voltage wiring harness to the DC/DC converter N83/1 causes a slow-acting insulation fault. This may occur sporadically only to start with before actively developing over time. Remedy Exchange high voltage PTC (interior heating) N33/14 with new part with diaphragm (production date as from 22T231, see component part label). If necessary, and after further testing/measurement, replace wiring harness for DC/DC converter N83/1 to high voltage PTC (interior heating) N33/14. Note: According to the Replacement Parts Department only high voltage PTCs (interior heating) with a diaphragm and with production date as from 22T231 are available! This Li only applies to vehicles with PN A 000 835 83 03 installed. If the vehicle has another part number installed, this does not apply.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI83.70-P-078292 | Service bulletin | Jun 16, 2026 | 11033926 | PDF, 219 KB |
| LI83.70-P-078292 | Service bulletin | Jan 9, 2025 | 11012788 | PDF, 219 KB |
| LI83.70-P-078292 | Service bulletin | Aug 13, 2024 | 11006688 | PDF, 216 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 000 835 83 03 | — | — | 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 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 9 model years this bulletin names have filed 181 complaints with NHTSA since 2015. 49 of them name Electrical System — 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
The speed limit indicator included in the software package flashes constantly (approximately once per second), both inside the instrument cluster and in the Heads Up Display. The speed limit shown is almost always not accurate to the current speed limit, even when passing multiple very clear road signs showing the speed limit.
2022 Mercedes-Benz EQS · Electrical System · filed with NHTSA Apr 28, 2026
The contact owns a 2023 Mercedes-Benz EQS 580 4MATIC. The contact stated that while attempting to open the front driver’s side door, the door sensors failed to detect a hand and retracted independently and closed on the right index finger. Medical attention was not sought. The failure mileage was approximately 63,350
2023 Mercedes-Benz EQS · Electrical System · filed with NHTSA Sep 25, 2026
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 visibility/wiper
Source: same model, same component group4 other manufacturer communications filed against these Mercedes-Benz models under the same component group (visibility/wiper), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI82.30-P-059239 | Service bulletin | May 19, 2026 | Complaint There are several types of complaint about noises or poor windshield wiper wiping performance: A: Wiper blades squeaking, chatteri… |
| LI77.21-P-075806 | Service bulletin | Apr 20, 2026 | Complaint The sliding sunroof glass panel of the panoramic roof reverses during the closing process, either once or multiple times, without… |
| LI83.30-P-079850 | Service bulletin | Jan 16, 2026 | Complaint Customer states the AC either does not cool/has poor performance or heat is insufficient. Cause Many possible root causes Remedy *… |
| LI83.30-P-079081 | Service bulletin | Apr 21, 2025 | Complaint Random heating of air conditioning system. Cause Temperature sensor in overhead control panel (OCP) delivering incorrect values: T… |
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 LI83.70-P-078292 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 LI83.70-P-078292 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.
Which vehicles does LI83.70-P-078292 cover?
The manufacturer filed it against 13 model years: 2026 Mercedes-Benz EQE, 2025 Mercedes-Benz EQE, 2024 Mercedes-Benz EQE, 2023 Mercedes-Benz EQE, 2026 Mercedes-Benz EQS, 2025 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.