Mercedes-Benz bulletin LI83.70-P-080411
What it saysComplaint No heating output is available during electric driving operation. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Apr 13, 2026, received Mar 30, 2026, about the visibility/wiper — 2 documents under this number. It names 18 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Complaint No heating output is available during electric driving operation. In conventional (combustion engine) driving operation, full heating output is available. Cause Possible defect in the N33/5 water heater (high-voltage PTC booster heater) Remedy If the N33/5 water heater (PTC booster heater, high voltage) is defective, it must be replaced with the latest part number. Note: Please refer to the information in XENTRY Parts Information and the latest WIS description. For vehicles manufactured before December 2025 with a BorgWarner water heater, the coolant hoses (inlet and outlet) must also be ordered and installed. For vehicles produced after December 2025, only the N33/5 water heater (PTC booster heater high voltage) needs to be replaced. Follow instructions in XPPI C74 note for the correct parts.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI83.70-P-080411 | Service bulletin | Apr 13, 2026 | 11031272 | PDF, 93 KB |
| LI83.70-P-080411 | Service bulletin | Mar 30, 2026 | 11030316 | PDF, 94 KB |
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 AMG C63 S E; 2024 Mercedes-Benz AMG C63 S E 4MATIC+; 2026 Mercedes-Benz E53 E 4MATIC+ ALL-Terrain.
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 15 model years this bulletin names have filed 266 complaints with NHTSA since 2015. 113 of them name Electrical System, Visibility/Wiper — 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 2025 Mercedes-Benz AMG. The contact stated that while starting the vehicle, the instrument panel became inoperable. The contact stated that the failure occurred after an over-the-air software update was completed for the instrument panel. The vehicle was taken to the dealer the vehicle was not diagnosed or repaired.
2025 Mercedes-Benz CLE-Class · Electrical System · filed with NHTSA May 29, 2026
1. Car's computer abruptly shutdown all controls/systems when lightly applying brake to stop at yellow light. Lost Total control of car, steering locked, 4 wheel drive locked all wheels, park brake inoperable, doors locked, windows would not operate, key fob was made inoperable, HVAC was inoperable, no lights worked except for Emerg…
2026 Mercedes-Benz E-Class · Electrical System · filed with NHTSA Jun 29, 2026
The digital instrument cluster and center infotainment display screen went completely black and blank while the vehicle was in motion. This immediate failure blinded the driver to critical safety telemetry, including the current vehicle speed, gear positioning, and active safety warning telltales, creating an immediate, severe crash…
2025 Mercedes-Benz E-Class · Electrical System · filed with NHTSA Jun 23, 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 group13 other manufacturer communications filed against these Mercedes-Benz models under the same component group (visibility/wiper), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI83.90-P-080935 | Service bulletin | Sep 25, 2026 | Complaint CEL illuminates and/or AC does not blow cold. Cause Potentially relevance to hardware and/or software Remedy Scenario 1: 1. If the… |
| LI83.55-P-080937 | Service bulletin | Sep 1, 2026 | Cause Internal failure of the scroll wheel within the AC compressor. Remedy Check the compressor's index and part number Figure 1 against Ta… |
| PSL-NCU Return Parts 6/19 | Other | Jun 19, 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… |
| 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-080504 | Service bulletin | May 18, 2026 | Complaint The panoramic sliding sunroof operates in a stepped movement. The panoramic roof becomes denormalized without an apparent reason… |
| LI72.40-P-071889 | Service bulletin | Apr 7, 2026 | Complaint When closing the door, the side window may remain slightly open (short stroke position). Automatic window raising function of side… |
| 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 *… |
| LI83.20-P-079559 | Service bulletin | Jul 18, 2025 | Complaint No cooling output, compressor inoperative. Cause Currently under analyzed. Remedy Please create a TIPS case and provide the follow… |
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-080411 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-080411 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-080411 cover?
The manufacturer filed it against 18 model years: 2026 Mercedes-Benz C-Class, 2025 Mercedes-Benz C-Class, 2024 Mercedes-Benz C-Class, 2023 Mercedes-Benz C-Class, 2022 Mercedes-Benz C-Class, 2026 Mercedes-Benz CLE-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built before Dec 2025; built after Dec 2025 — the build date is on the certification label in the driver’s door jamb.