Honda bulletin AEBM08262026901
What it saysDealer Message - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire, and/or DTCs P0300 through P0304 stored. NHTSA’s full summary ↓
Honda filed this with NHTSA as a manufacturer communication dated Aug 26, 2026, received Aug 27, 2026, about the engine. It names 30 model years (2016–2026). A manufacturer communication 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 communicationDealer Message - Under certain conditions, the cylinder head gasket effectiveness may be reduced which may cause vehicles to experience overheating, coolant loss, misfire, and/or DTCs P0300 through P0304 stored.
Trouble codes it names: P0300 P0304
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| AEBM08262026901 | Other | Aug 26, 2026 | 11036424 | PDF, 62 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 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 30 model years this bulletin names have filed 17,213 complaints with NHTSA since 2015. 2,698 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.
I purchased a new 2023 Honda Accord from Woodland Hills Honda on 1/20/24. On 1/23/24, I pull into my garage after driving home from work and turn off the car. I get out to an overwhelming smell of gasoline. I inspect the car for visible leaks, which I don’t see, but the gasoline fumes kept growing and spreading throughout my garage.
2023 Honda Accord · Engine · filed with NHTSA Jan 31, 2024 · ODI 11569031
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
It is a common issue on the Honda Civic Type R from 2017 to 2021 in which water will leak through the hood scoop causing water to drip onto cylinder 4 causing a misfire. Misfire No. 4 Cylinder (DTC P0304). There is a TSB for it under 25-062 for this same issue. Water could enter the hood scoop and accumulate down inside the no.
2018 Honda Civic · Engine · filed with NHTSA May 28, 2026 · ODI 11740562
In depth: 2021 Honda Accord engine problems → · 2020 Honda Accord engine problems → · 2019 Honda Accord engine problems → · 2018 Honda Accord 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 group97 other manufacturer communications filed against these Honda models 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 |
|---|---|---|---|
| A26-099 | 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… |
| A26-098 | 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… |
| A26-097 | 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… |
| A26-013 | 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… |
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 AEBM08262026901 a recall?
No. A manufacturer communication 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 AEBM08262026901 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 AEBM08262026901 cover?
The manufacturer filed it against 30 model years: 2026 Honda Accord, 2025 Honda Accord, 2024 Honda Accord, 2023 Honda Accord, 2022 Honda Accord, 2021 Honda Accord and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.