Honda bulletin A23-026
What it saysUnder certain circumstances, the vehicle may experience driveability concerns. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated May 2, 2024, received Mar 23, 2023, about the engine — 2 documents under this number. It names 5 model years (2018–2022). 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.
Get the next Honda Accord bulletin by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationService Bulletin - Under certain circumstances, the vehicle may experience driveability concerns. This may result in the following DTCâs to set: ⢠P0300 (Random Misfire Detected), ⢠P0301 (No. 1 Cylinder Misfire Detected), ⢠P0302 (No. 2 Cylinder Misfire Detected), ⢠P0303 (No. 3 Cylinder Misfire Detected), ⢠P0304 (No. 4 Cylinder Misfire Detected), ⢠P0172 (Fuel System Too Rich)
Trouble codes it names: P0300 P0301 P0302 P0172 P0303 P0304 3 of 6 read from the document itself
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A23-026 | Service bulletin | May 2, 2024 | 11000139 | PDF, 56 KB |
| A23-026 | Service bulletin | Mar 14, 2023 | 10233208 | PDF, 214 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 37805-6B2-AA1 | — | — |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1255D8 | Update PGM-FI software (includes DTC clear) | 0.2 hrs |
Read by machine from the document NHTSA serves (3 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.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
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.
Email me new Honda bulletins for the Accord
A weekly email, sent only in a week when Honda files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 5 model years this bulletin names have filed 3,772 complaints with NHTSA since 2015. 993 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 Accord, the 122 owners who gave an odometer reading for Engine reported it at a median of 70,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The contact owns a 2019 Honda Accord. The contact stated while driving approximately 40 MPH, the vehicle inadvertently stalled. The contact stated that the check engine warning light was illuminated. The contact was able to restart the vehicle after waiting approximately two hours. The vehicle was not taken to a local dealer.
2019 Honda Accord · Engine · filed with NHTSA Dec 9, 2021
My car is a hybrid. At times, a Very loud humming noise is produced, due to glitch in software with the ANC. Noise starts and stops suddenly, intermittently, without warning, and is a safety hazard. Noise can build to be extremely loud and jarring, and can last for several minutes.
2020 Honda Accord · Engine · filed with NHTSA Mar 19, 2022
Twice while driving at highway speeds the check engine light came on. My car's engine was misfiring, and I have no acceleration. Both times, I took local roads home on which I could drive below 35 mph. Pulling out from traffic lights and stop signs was difficult.
2021 Honda Accord · Engine · filed with NHTSA Dec 5, 2024
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 group48 other manufacturer communications filed against the Honda Accord 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 |
|---|---|---|---|
| A26-007 | 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… |
| A26-006 | 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… |
| A26-005 | 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… |
| A26-004 | 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… |
| A26-003 | 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… |
| AEBM07242026902 | Other | Jul 24, 2026 | Dealer Message - To help improve engine temperatures, a software update has been developed for the electric water pump to optimize its opera… |
| A25-017 | Service bulletin | Jun 23, 2026 | Service Bulletin - A slight engine vibration and the Malfunction Indicator Lamp (MIL) is ON with DTC P0700… |
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 A23-026 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 A23-026 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 A23-026 cover?
The manufacturer filed it against 5 model years: 2022 Honda Accord, 2021 Honda Accord, 2020 Honda Accord, 2019 Honda Accord, 2018 Honda Accord. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.