Mercedes-Benz bulletin LI47.20-P-071172
What it saysCheck engine light active and FC P146364 Temp. and pressure sensor B4/7 is stored in Engine control unit and Fuel pump control unit. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Apr 23, 2024, received May 1, 2024, about the engine. It names 10 model years (2019–2021). 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.
Get the next Mercedes-Benz bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationCheck engine light active and FC P146364 Temp. and pressure sensor B4/7 is stored in Engine control unit and Fuel pump control unit. Software parameter in Fuel pump control unit. Perform software update for Fuel System Control Module (FSCM) N118. New software is A0009026661.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI47.20-P-071172 | Service bulletin | Apr 23, 2024 | 10253715 | PDF, 35 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A0009026661 | — | — |
Read by machine from the document NHTSA serves (2 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.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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 themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new Mercedes-Benz bulletins for one of these models
A weekly email, sent only in a week when Mercedes-Benz files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 10 model years this bulletin names have filed 511 complaints with NHTSA since 2015. 345 of them name Electrical System, Engine, 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 2020 Mercedes-Benz GLE-Class, the 13 owners who gave an odometer reading for Electrical System reported it at a median of 6,615 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
As I was driving down road car began to lose power, check engine light came on and car went into limp mode. Car was towed to nearest repair shop where analysis was made. I was advised to take to dealership for repair. Advised that there was a service campaign issued by the manufacturer on GLB class with M260 motors. See attached report.
2021 Mercedes-Benz GLB-Class · Engine · filed with NHTSA Jul 30, 2026 · ODI 11753817
Complete engine failure mid driving on highway. NO engine light prior to complete engine failure. Vehicle has been towed to two different Mercedes Benz auto dealerships. Both service directors concur that this should not have occurred with zero warning and low mileage of 64,856 with an impeccable service record at Mercedes Benz Came on…
2020 Mercedes-Benz GLB-Class · Engine · filed with NHTSA Aug 15, 2026 · ODI 11757113
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 group47 other manufacturer communications filed against these Mercedes-Benz models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI18.00-P-073137 | Service bulletin | Sep 26, 2026 | Complaint Sporadic warning message in instrument cluster "Engine oil pressure stop switch off vehicle" (or similar) is shown in red on vehi… |
| LI20.10-P-075374 | Service bulletin | Sep 17, 2026 | Complaint Red coolant warning in instrument cluster. Fault codes U019F00 or U019F87 current/stored in MRG1 control unit. Cause Various cause… |
| LI01.20-P-080884 | Service bulletin | Aug 12, 2026 | Complaint Oil leaks found on M176 or M177 engines diagnosed to be from the cylinder head cover area Cause Unknown (under investigation) Reme… |
| LI07.10-P-080384 | Service bulletin | Aug 7, 2026 | Complaint Customer reports Check Engine Light with possible loss of power concern. The Following DTC's are present • P210185 - The throttle… |
| PSL-NCU Return Parts 7/24 | Other | Jul 24, 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… |
| LI20.10-P-072886 | Service bulletin | Jul 24, 2026 | Complaint Check Engine Light ON with DTC P012800 "The Coolant Temperature is Below the Specified Temperature" active and/or stored in the ME… |
| NCU - 2026040007 | Service campaign | May 8, 2026 | Mercedes-Benz AG (MBAG), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (MY) 2024 CLA (118 platform)… |
| CL - 2026010005 | Other | Apr 18, 2026 | Dear Mercedes-Benz Owner: On behalf of Mercedes-Benz USA, LLC (“MBUSA”), thank you for being a part of the Mercedes-Benz family. We hope tha… |
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 LI47.20-P-071172 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 LI47.20-P-071172 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 LI47.20-P-071172 cover?
The manufacturer filed it against 10 model years: 2020 Mercedes-Benz A-Class, 2019 Mercedes-Benz A-Class, 2020 Mercedes-Benz CLA-Class, 2021 Mercedes-Benz GLA-Class, 2021 Mercedes-Benz GLB-Class, 2020 Mercedes-Benz GLB-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.