Honda bulletin A26-099
Honda filed this with NHTSA as a service bulletin dated Aug 28, 2026, received Aug 27, 2026, about the engine — 2 documents under this number. It names 2 model years (2016–2017). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationService Bulletin - 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 thru P0304 stored.
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| A26-099 | Service bulletin | Aug 28, 2026 | 11036654 |
| A26-099 | Service bulletin | Aug 26, 2026 | 11036419 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. 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. Quote it 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.
Common questions
Source: NHTSA, 49 CFR 579.5Is Honda A26-099 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 A26-099 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.
Which vehicles does A26-099 cover?
The manufacturer filed it against 2 model years: 2017 Honda Civic, 2016 Honda Civic. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.