Mercedes-Benz bulletin LI09_40-N-079144
What it saysComplaint The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner: P300A6D The boost pressure is too low. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jun 29, 2026, received Jul 2, 2026, about the power train — 2 documents under this number: LI09.40-N-079144 and 1 more. It names 3 model years (2023–2025). 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 The check engine light is activated, accompanied by one or more of the following fault codes related to the Boost Pressure Positioner: • P300A6D The boost pressure is too low. Charge Air Cooler. • P300974 Component 'Boost pressure positioner' has a malfunction. The boost pressure is too low. • P300DFB Component 'Boost pressure positioner' has a malfunction. • P300DE8 Boost pressure control A has a malfunction after the cold start. Cause The potential causes for these fault codes are: A. Leak or Blockage in the Intake or Charge Air System: This can prevent the proper flow of air, affecting the boost pressure. B. Insufficient Source Vacuum, Vacuum Leak, or Sticking/Weak Vacuum Component: These issues can prevent the boost pressure positioner from functioning correctly. • For Model Year 2023-Cuurent vehicles operating at approximately 4,000 ft elevation or above, reduced ambient pressure and/or high brake demand may contribute to reduced available vacuum differential and under boost com-plaints, even when no discrete vacuum component failure is identified. C. Internal Malfunction of the Boost Pressure Positioner: The component itself may be faulty. D. Internal Defect with the Variable Turbine Geometry (VTG) System inside the Turbocharger: Issues within the turbo-charger can affect boost pressure control. Remedy Engineering Review Required: For vehicles operating at approximately 4,000 ft elevation or above, a TIPS case MUST be opened before replacing any component for fault codes P300A6D, P300974, P300DFB, or P300DE8.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI09_40-N-079144 | Service bulletin | Jun 29, 2026 | 11034408 | PDF, 2,437 KB |
| LI09.40-N-079144 | Service bulletin | Jun 3, 2026 | 11034409 | PDF, 2,437 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A654 070 23 32 | — | — |
Read by machine from the document NHTSA serves (6 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 themA 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 3 model years this bulletin names have filed 58 complaints with NHTSA since 2015. 17 of them name Power Train, 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.
The High-Pressure Fuel Pump (HPFP) and corresponding fuel delivery pressure regulator/sensors have suffered an internal mechanical failure. The system intermittently fails to maintain commanded rail pressure, leading to critical engine cylinder misfires (P0302, P0304) and severe long-term fuel adaptation breaches (P00C600, P008992…
2023 Mercedes-Benz Sprinter · Power Train · filed with NHTSA Oct 11, 2026 · ODI 11770454
Subject: Transmission Failure Safety Complaint I am submitting a complaint regarding a serious transmission problem with my vehicle. While driving, the transmission suddenly failed, and the vehicle lost the ability to move properly. The car would not accelerate as expected and had difficulty.
2025 Mercedes-Benz Sprinter · Power Train · filed with NHTSA Apr 30, 2026 · ODI 11734794
Occasionally, the idle speed of the engine will drop to 400 rpm. When this happens, the vehicle does not respond to throttle input. If it happens in a parking lot, you can shift into park and coax the rpm higher, then shift to drive and move on.
2023 Mercedes-Benz Sprinter · Fuel/Propulsion System · filed with NHTSA Jul 15, 2025 · ODI 11673832
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 power train
Source: same model, same component group12 other manufacturer communications filed against the Mercedes-Benz Sprinter under the same component group (power train), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI27_20_N_080998_1 | Service bulletin | Sep 25, 2026 | Sprinter 907 with 725.0 (NAG3 Classic) Transmission ‑ Shudder during acceleration Complaint Shudder may be felt in the following situations:… |
| LI28_00-N-079097_1_en | Service bulletin | Aug 26, 2026 | Complaint While driving through muddy / sandy/ off road terrain "4Matic Currently Unavailable" message on the dash Cause This vehicle is not… |
| LI20_10-N-080868_1_en | Service bulletin | Aug 6, 2026 | Complaint The coolant warning lamp may be displayed in the instrument cluster. The malfunction indicator lamp (MIL) may also be illuminated.… |
| LI18_40-N-080867_1_en | Service bulletin | Aug 5, 2026 | OM654 Engine Oil Consumption Complaint The customer may report repeated low engine oil level warnings in the instrument cluster. The custome… |
| LI33_30-N-080795 | Service bulletin | Jul 17, 2026 | Model 907 with all-wheel drive (A4M) – All-wheel drive inoperative Complaint The customer may report one or more of the following: • All-whe… |
| LI00.20-N-080626 | Service bulletin | Jun 2, 2026 | Complaint ASSYST values in XENTRY actual values and workshop menu of instrument cluster are implausibly excessive. Infor-mation: According… |
| LI35.00-N-080267_1 | Service bulletin | May 26, 2026 | Sprinter 907 - Rear Axle Noise Diagnosis Best Practices Complaint Various noises from area of rear axle while driving Cause A: Howling Noise… |
| LI28.00-N-063339 | Service bulletin | Dec 1, 2025 | Clunking noise on load change or gear engagement Complaint Clunking noise can be heard on some load changes or when changing from N->R or N… |
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 LI09_40-N-079144 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 LI09_40-N-079144 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 LI09_40-N-079144 cover?
The manufacturer filed it against 3 model years: 2025 Mercedes-Benz Sprinter, 2024 Mercedes-Benz Sprinter, 2023 Mercedes-Benz Sprinter. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.