Mercedes-Benz bulletin LI47.50-P-078804
What it saysComplaint Customer-perceived problem: Fuel gauge reading implausible MIL ON (market-dependent) N118/3 Fault codes in control units FSCM_GEN4/5/6 For these fault codes, the tests contained in XENTRY must be carried out… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Feb 21, 2025, received Jan 28, 2025, about the fuel/propulsion system — 2 documents under this number. It names 74 model years (2016–2025). 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 Customer-perceived problem: • Fuel gauge reading implausible • MIL ON (market-dependent) N118/3 Fault codes in control units FSCM_GEN4/5/6 • For these fault codes, the tests contained in XENTRY must be carried out P046109 / P206609 / P13E600 • For these fault codes, the connector couplings/wiring harness routing must be checked for damage P206600 / P046100 Cause Various Remedy Carry out XENTRY tests for the listed fault codes in the FSCM (N118) and document the monitor graphics for the primary/ secondary lever-type sensors.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI47.50-P-078804 | Service bulletin | Feb 21, 2025 | 11014402 | PDF, 322 KB |
| LI47.50-P-078804 | Service bulletin | Jan 24, 2025 | 11013179 | PDF, 321 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 themand 29 more on this site: 2022 Mercedes-Benz GLB-Class, 2021 Mercedes-Benz GLB-Class, 2020 Mercedes-Benz GLB-Class, 2024 Mercedes-Benz GLC-Class, 2023 Mercedes-Benz GLC-Class, 2022 Mercedes-Benz GLC-Class, 2021 Mercedes-Benz GLC-Class, 2020 Mercedes-Benz GLC-Class, 2019 Mercedes-Benz GLC-Class, 2018 Mercedes-Benz GLC-Class, 2017 Mercedes-Benz GLC-Class, 2016 Mercedes-Benz GLC-Class, 2025 Mercedes-Benz GLE-Class, 2024 Mercedes-Benz GLE-Class, 2023 Mercedes-Benz GLE-Class, 2022 Mercedes-Benz GLE-Class, 2021 Mercedes-Benz GLE-Class, 2020 Mercedes-Benz GLE-Class, 2019 Mercedes-Benz GLE-Class, 2024 Mercedes-Benz GLS-Class, 2023 Mercedes-Benz GLS-Class, 2022 Mercedes-Benz GLS-Class, 2021 Mercedes-Benz GLS-Class, 2020 Mercedes-Benz GLS-Class, 2019 Mercedes-Benz GLS-Class, 2024 Mercedes-Benz S-Class, 2023 Mercedes-Benz S-Class, 2022 Mercedes-Benz S-Class, 2021 Mercedes-Benz S-Class.
Also filed against model years this site has no page for: 2022 Mercedes-Benz AMG C63 S; 2021 Mercedes-Benz AMG E53 S; 2023 Mercedes-Benz AMG E53E; 2022 Mercedes-Benz AMG E63; 2022 Mercedes-Benz AMG E63S.
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 69 model years this bulletin names have filed 3,200 complaints with NHTSA since 2015. 329 of them name Fuel/Propulsion 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.
On the 2016 Mercedes-Benz C-Class, the 19 owners who gave an odometer reading for Fuel/Propulsion System reported it at a median of 60,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Vehicle: 2020 Mercedes-Benz GLB 250 4MATIC Current mileage: Approximately 109,000 Date of most recent major incident:XXX I am reporting serious, recurring safety concerns involving my 2020 Mercedes-Benz GLB 250 4MATIC, including engine malfunction, loss of acceleration, repeated overheating, misfire warnings, and intermittent electronic…
2020 Mercedes-Benz GLB-Class · Fuel/Propulsion System · filed with NHTSA Oct 14, 2026 · ODI 11771107
Date of occurrence: 03/05/2024 Subject: Formal Claim Regarding Traffic Safety Issue with 2021 Mercedes Benz CLA 250 I am writing to formally submit a claim regarding a recent traffic safety incident involving my 2021 Mercedes Benz CLA 250. While driving to my destination, I encountered a sudden loss of power and inability to accelerate.
2021 Mercedes-Benz CLA-Class · Fuel/Propulsion System · filed with NHTSA Mar 5, 2024 · ODI 11575656
The contact owns a 2021 Mercedes-Benz E350. The contact stated while driving at approximately 60 MPH, the check engine warning light illuminated, and the vehicle decelerated to 30 MPH. The vehicle was taken to the local mechanic who diagnosed that the fuel pump was faulty and needed to be replaced. The vehicle was not repaired.
2021 Mercedes-Benz E-Class · Fuel/Propulsion System · filed with NHTSA Jan 22, 2024 · ODI 11567020
In depth: 2016 Mercedes-Benz C-Class fuel system problems →
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 fuel/propulsion system
Source: same model, same component group3 other manufacturer communications filed against these Mercedes-Benz models under the same component group (fuel/propulsion system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI47.10-P-079604 | Service bulletin | Jul 27, 2026 | Complaint Audible "slurping" operating noise from the fuel tank Cause Conditions: • The fuel tank is around half full • The secondary chambe… |
| LI47.10-P-079166 | Service bulletin | Sep 5, 2025 | Complaint A pulsating knocking noise (e.g. clattering) can be heard underneath the bench seat, particularly in the case of a full tank… |
| NCU - 2022070004 | Service campaign | Oct 18, 2024 | Mercedes-Benz AG ("MBAG"), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2018 - 2024 E-Class… |
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 LI47.50-P-078804 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 LI47.50-P-078804 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 LI47.50-P-078804 cover?
The manufacturer filed it against 74 model years: 2022 Mercedes-Benz A-Class, 2021 Mercedes-Benz A-Class, 2020 Mercedes-Benz A-Class, 2019 Mercedes-Benz A-Class, 2024 Mercedes-Benz C-Class, 2023 Mercedes-Benz C-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.