Honda bulletin A25-077
What it saysOil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Jul 29, 2025, received Aug 8, 2025, about the engine. It names 10 model years (2017–2026). 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 communicationService Bulletin - Oil leak at timing chain tensioner inspection cover due to possible insufficient sealant adhesion on inspection cover.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A25-077 | Service bulletin | Jul 29, 2025 | 11021746 | PDF, 594 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 11412-59B-000 | — | — |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1107A3 | Perform an engine oil leak diagnosis. Re-seal timing chain inspection cover | 0.6 hrs |
| 1101KH | Perform an engine oil leak diagnosis. Replace timing chain inspection cover | 0.6 hrs |
Read by machine from the document NHTSA serves (4 pages), read Oct 4, 2026. A part number is shown only where it matches Honda’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 10 model years this bulletin names have filed 7,884 complaints with NHTSA since 2015. 1,377 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.
On the 2018 Honda CR-V, the 359 owners who gave an odometer reading for Engine reported it at a median of 6,200 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
2021 Honda CRV Hybrid. 11/9/22: When accelerating to merge onto a highway, moving at approximately 50 mph, the vehicle rapidly decelerated as driver tried to accelerate (went into limp mode), the check engine light came on and the engine made a continuous clattering sound. The vehicle would not go above 15 mph in 55-60 mph traffic.
2021 Honda CR-V · Engine · filed with NHTSA Dec 1, 2022 · ODI 11495632
When car is idle and hybrid battery switches to gasoline engine the engine shakes violently and warning lamps and messages for engine and transmission error come on. It's becoming more of a problem and dealerships do not know how to correctly diagnosis it. I've taken my car to the dealership twice and still the problems occur.
2024 Honda CR-V · Engine · filed with NHTSA Jun 23, 2024 · ODI 11595980
When I stop on level road and take foot off brake the engine accelerates from 700 RPM to 1000-1100 RPM up tp 7mph. Thats without touching gas pedal. I brought car to dealer and they test drove car. Report says "vehicle will accelerate till reaches7ph then drop to idle speed. This is vehicle normal operation condition.
2018 Honda CR-V · Engine · filed with NHTSA Jun 5, 2018 · ODI 11100073
In depth: 2021 Honda CR-V engine problems → · 2020 Honda CR-V engine problems → · 2019 Honda CR-V engine problems → · 2018 Honda CR-V engine 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 engine
Source: same model, same component group36 other manufacturer communications filed against the Honda CR-V under the same component group (engine), newest first. The eight newest are listed; the rest are on the Honda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| A26-098 | Service bulletin | Sep 25, 2026 | Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience ov… |
| A26-019 | Service bulletin | Sep 25, 2026 | Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience ov… |
| A26-018 | Service bulletin | Sep 25, 2026 | Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience ov… |
| A26-017 | Service bulletin | Sep 25, 2026 | Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience ov… |
| A26-016 | Service bulletin | Sep 25, 2026 | Service Bulletin - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience ov… |
| AEBM08262026901 | Other | Aug 26, 2026 | Dealer Message - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience over… |
| A25-017 | Service bulletin | Jun 23, 2026 | Service Bulletin - A slight engine vibration and the Malfunction Indicator Lamp (MIL) is ON with DTC P0700… |
| ATI&03272026903 | Other | Mar 27, 2026 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2021 CR-V FHEVs with a customer complaint of an oil leak comi… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Honda, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Honda A25-077 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 A25-077 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 A25-077 cover?
The manufacturer filed it against 10 model years: 2026 Honda CR-V, 2025 Honda CR-V, 2024 Honda CR-V, 2023 Honda CR-V, 2022 Honda CR-V, 2021 Honda CR-V and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.