Acura bulletin B25-048
What it saysOil leak at the cam chain tensioner inspection cover due to and insufficient sealant adhesion on the inspection cover. NHTSA’s full summary ↓
Acura filed this with NHTSA as a service bulletin dated Sep 17, 2025, received Sep 23, 2025, about the engine. It names 5 model years (2021–2025). 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 communicationService Bulletin - Oil leak at the cam chain tensioner inspection cover due to and insufficient sealant adhesion on the inspection cover.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B25-048 | Service bulletin | Sep 17, 2025 | 11023273 | PDF, 982 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 11412-RPY-G00 | — | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1107A3 | Perform an engine oil leak diagnosis. Re-seal cam chain inspection cover | 0.7 hrs |
| 1101KH | Perform an engine oil leak diagnosis. Replace cam chain inspection cover | 0.7 hrs |
Read by machine from the document NHTSA serves (5 pages), read Oct 4, 2026. A part number is shown only where it matches Acura’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 5 model years this bulletin names have filed 168 complaints with NHTSA since 2015. 2 of them name Engine — 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.
I understand Honda isn't doing soo well so I hope this is added to the list of the feds research we just bought this tlx aspec don't understand how these cars need to be 4000lbs but anyway the gas mileage advertised is not what you get I've seen on multiple forms people are saying they experience 13 mpg and on a cylinder engine that is…
2024 Acura TLX · Engine · filed with NHTSA Nov 16, 2024 · ODI 11625729
I would like to report a serious safety issue with the 2021 Acura TLX Type s. Recently in April 2024, while driving, I heard a loud pop from the vehicle, and it turned out that the transfer case had burst into the transmission. This failure has rendered the rear-wheel drive non-functional, resulting in severe oversteer.
2021 Acura TLX · Engine · filed with NHTSA Nov 9, 2024 · ODI 11624322
While driving in humid, rainy conditions for over five hours, I experienced a sudden and dangerous loss of acceleration. Moisture appears to have built up, resulting in a misfire and a flashing MIL/Check Engine light.
2025 Acura TLX · Engine · filed with NHTSA Jun 3, 2025 · ODI 11664634
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 group13 other manufacturer communications filed against the Acura TLX under the same component group (engine), newest first. The eight newest are listed; the rest are on the Acura list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| BPS&08122025901 | Other | Aug 12, 2025 | Dealer Message - Acura is also implementing an additional (1) twenty-four (24) month period for 2015 model year Acura TLX vehicles, commenci… |
| B22-009 | Service bulletin | Jul 7, 2025 | "Service bulletin - Under certain circumstances, after coming to a stop and engaging idle stop the vehicle may not restart automatically due… |
| BTI&04302025902 | Other | Apr 30, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023 RDXs and TLXs with a client complaint of the "Emissions… |
| BTI&04162025902 | Other | Apr 16, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023 RDXs and TLXs with a client complaint of the "Emissions… |
| BTI&11132024902 | Other | Nov 13, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023 RDXs and TLXs with a client complaint of the "Emissions… |
| BTI&10242024903 | Other | Oct 24, 2024 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023 RDXs and TLXs with a client complaint of the "Emissions… |
| B24040A | Other | May 1, 2024 | Service News - Due to On-Board Diagnostic (OBD) regulation change starting with 2019 vehicles, American Honda’s Variable Valve Timing and Li… |
| B20-053 | Service bulletin | Mar 12, 2024 | Service Bulletin - The MIL is flashing with a loss of power. This is most common in hot, humid regions, or after a period of rainfall. Humid… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Acura, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Acura B25-048 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 B25-048 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 Honda warranty extension on file lists the ones Honda has filed.
Which vehicles does B25-048 cover?
The manufacturer filed it against 5 model years: 2025 Acura TLX, 2024 Acura TLX, 2023 Acura TLX, 2022 Acura TLX, 2021 Acura TLX. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.