Honda bulletin A25-062
What it saysWater could enter the hood scoop and accumulate down inside the no. 4 spark plug hole. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Oct 13, 2025, received Aug 21, 2025, about the engine — 2 documents under this number. It names 5 model years (2017–2021). 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 - Water could enter the hood scoop and accumulate down inside the no. 4 spark plug hole. This can corrode the ignition coil, plug tube, and spark plug, leading to a misfire to the no. 4 cylinder. If a misfire is detected, DTC P0304 is stored.
Trouble codes it names: P0304
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A25-062 | Service bulletin | Oct 13, 2025 | 11024893 | PDF, 585 KB |
| A25-062 | Service bulletin | Aug 19, 2025 | 11022041 | PDF, 585 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 12310-5BA-A01 | Cover Assy., Cylinder Head | 1 | eBay Motors → |
| 17136-5BF-A00 | Rubber set, Breather | 1 | eBay Motors → |
| 91307-RCA-A01 | O-ring | 1 | eBay Motors → |
| 91308-RCA-A01 | O-ring | 1 | eBay Motors → |
| 30520-59B-023 | Coil Assy., Plug Top (Ignition Coil) | 1 | eBay Motors → |
| 12290-59B-003 | — | 1 | |
| 90012-59B-004 | Nut, Self-Lock (10 mm) | 4 | eBay Motors → |
| 06110-RPY-G02 | Gasket Kit, Cyl. Head | 1 | eBay Motors → |
| 19524-RPY-G01 | Gasket, Turbocharger Pipe | 1 | eBay Motors → |
| 16012-RPY-315 | Pipe Set, Fuel Joint | 1 | eBay Motors → |
| 16013-RPY-305 | Pipe, Fuel Feed | 1 | eBay Motors → |
| 16451-RPY-G01 | Clip, Injector | 4 | eBay Motors → |
| 91310-RPY-G01 | O-ring | 4 | eBay Motors → |
| 91312-RPY-G01 | Disk, Supporting | 4 | eBay Motors → |
| 12209-PR3-000 | Washer, Sealing (20 mm) | 2 | eBay Motors → |
| 10003-RPY-G01 | General Assy., Cylinder Head | 1 | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1105E1 | Repair Procedure B: Replace cylinder head (includes inspection, DTC clear, idle… | 13.6 hrs |
Read by machine from the document NHTSA serves (6 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 5 model years this bulletin names have filed 2,233 complaints with NHTSA since 2015. 166 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 2017 Honda Civic, the 41 owners who gave an odometer reading for Engine reported it at a median of 22,250 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
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
I recently discovered that coolant has been leaking into two of my cylinders, causing an overheating issue. The Honda dealership tells me this is a known issue for their engines for that year range, so much so that an extended warranty has been added to all other engines but there is a carve out for the Type-R.
2021 Honda Civic · Engine · filed with NHTSA Oct 28, 2026 · ODI 11774237
The contact owns a 2019 Honda Civic SI. The contact stated that while her husband was driving at an undisclosed speed, the accelerator pedal was depressed; however, the vehicle failed to accelerate as intended. The contact's husband heard a loud screeching sound coming from the engine compartment.
2019 Honda Civic · Engine · filed with NHTSA May 16, 2024 · ODI 11589164
In depth: 2018 Honda Civic engine problems → · 2017 Honda Civic 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 group49 other manufacturer communications filed against the Honda Civic 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… |
| A26-097 | 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… |
| A26-013 | 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… |
| A26-012 | 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… |
| A26-011 | 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… |
| A26-010 | 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… |
| A26-009 | 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… |
| A26-008 | 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 A25-062 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 A25-062 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 A25-062 cover?
The manufacturer filed it against 5 model years: 2021 Honda Civic, 2020 Honda Civic, 2019 Honda Civic, 2018 Honda Civic, 2017 Honda Civic. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.