Honda bulletin A25-061
What it saysThe piston ring function deteriorates due to ring wear and sticking from sludge. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Aug 29, 2025, received Jul 2, 2025, about the engine — 3 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationService Bulletin - The piston ring function deteriorates due to ring wear and sticking from sludge. Oil from the crankcase adheres to the spark plug leading to carbon fouling and misfire. This can set DTCs P0301 No. 1 cylinder misfire detected, P0302 No. 2 cylinder misfire detected, P0303 No. 3 cylinder misfire detected, P0304 No. 4 cylinder misfire detected, and cause the MIL to come on.
Trouble codes it names: P0301 P0302 P0303 P0304 P0306 1 of 5 read from the document itself
One of the 432 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A25-061 | Service bulletin | Aug 29, 2025 | 11022768 | PDF, 3,018 KB |
| A25-061 | Service bulletin | Jul 18, 2025 | 11020825 | PDF, 7,871 KB |
| A25-061 | Service bulletin | Jun 17, 2025 | 11020085 | PDF, 8,014 KB |
What the document itself lists
The manufacturer titles it “Warranty Extension: 2013–17 Odyssey MIL Comes on with DTCs P0301”.
Parts the bulletin names — the first 40 it lists
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 13021-5G0-A01 | — | — | |
| 12251-R70-A01 | Cyl. Gasket (Fr) | 1 | eBay Motors → |
| 12261-R70-A01 | Drain Washer (14 mm) 94109-14000 | 1 | eBay Motors → |
| 18716-R70-A01 | — | 1 | |
| 18719-R70-A01 | — | 1 | |
| 18115-R70-A01 | — | 2 | |
| 18115-5G0-A01 | — | 2 | |
| 18212-SA7-003 | — | 2 | |
| 12030-R70-A00 | Head Gasket Fr. (Valve Cover) | 1 | eBay Motors → |
| 12050-R70-A00 | — | 1 | |
| 17146-R70-A01 | — | 1 | |
| 17105-RCJ-A01 | — | 1 | |
| 15400-PLM-A02 | — | 1 | |
| 91301-PLC-000 | — | 2 | |
| 91314-PH7-003 | — | 2 | |
| 13011-RV0-305 | — | 4 | |
| 18393-SDB-A00 | — | 1 | |
| 90212-RCA-A01 | Self-locking Nut (10 mm) 90212–SA5-003 | 8 | eBay Motors → |
| 12290-R71-L01 | — | 4 | |
| 15221-RYE-A01 | — | 1 | |
| 90164-SHJ-A00 | Bolt, Flange (12 x 115) (Side Engine Mount | 2 | eBay Motors → |
| 90161-SZA-A00 | Page 5 of | 1 | eBay Motors → |
| 14551-RCA-A01 | — | 1 | |
| 19411-P8A-A03 | Water Gasket Rr. 19412–P8A-A02 | 1 | eBay Motors → |
| 13204-P8A-A01 | Washer-Bolt (12 x 163) (may require up to 8 bolts per | 8 | eBay Motors → |
| 90005-PAA-A01 | — | 16 | |
| 11107-PWA-300 | Washer, Sealing (24 mm) (6AT Fill Plug Washer) | 1 | eBay Motors → |
| 90471-PX4-000 | Washer, Drain Plug (18 mm) (6AT Drain Plug Washer) | 1 | eBay Motors → |
| 90212-SA5-003 | Nut, Self-Lock (10 mm) (Exhaust pipe A nuts) | 9 | eBay Motors → |
| 90163-SDA-A01 | Bolt, Flange (Side Mount Bolt to Frame Bracket) | 2 | eBay Motors → |
| 90163-S5A-000 | Bolt, Flange (10 x 20) (Front & Rear engine mount bolts) | 8 | eBay Motors → |
| 90371-SAA-010 | Bolt, Flange (10 x 75) (Rear Engine Mount Bolts) 95701-12065-08 | 4 | eBay Motors → |
| 90163-SDB-A00 | Bolt, Flange (10 x 30) (Front Engine Mount Bracket Bolts) | 3 | eBay Motors → |
| 90163-SHJ-A00 | Bolt, Flange (12 x 83) (Rear Engine Mount Bracket Bolts) | 4 | eBay Motors → |
| 91370-TA0-000 | O-RING | 1 | eBay Motors → |
| 31270-RJA-A01 | Starter Motor Gasket | 1 | eBay Motors → |
| 14513-RCA-A01 | Bolt, Timing Belt Adjuster | 1 | eBay Motors → |
| 90119-SHJ-A00 | Bolt, Flange (Strut to Knuckle) | 4 | eBay Motors → |
| 90382-SP0-003 | Nut, Flange (Strut to Knuckle) | 4 | eBay Motors → |
| 90165-TK8-A00 | Bolt, Flange (Special Bolt, Subframe) | 4 | eBay Motors → |
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1115A7 | DTC P0301, P0302 or P0303: Inspect spark plug(s) | 0.3 hrs |
| 1115A8 | DTC P0304: Inspect spark plug(s) | 0.3 hrs |
Read by machine from the document NHTSA serves (65 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 2 model years this bulletin names have filed 310 complaints with NHTSA since 2015. 107 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 2016 Honda Odyssey, the 29 owners who gave an odometer reading for Engine reported it at a median of 85,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
2017 Honda Odyssey Piston ring failure leading to stop spark plug working while driving. This makes car shake heavily and can’t drive more than 20mph, sound from engine is loud. Had been happening every 1000 miles or so, changing spark plug temporary fix it. Spark plug starts failing one after another.
2017 Honda Odyssey · Engine · filed with NHTSA Jan 31, 2025 · ODI 11639830
In depth: 2016 Honda Odyssey 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 group21 other manufacturer communications filed against the Honda Odyssey 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 |
|---|---|---|---|
| ATI&05122026902 | Other | May 13, 2026 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 Odysseys & Ridgelines and 2024-2025 Passports with… |
| ATI&04292026901 | Other | Apr 29, 2026 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2024-2026 Odysseys & Ridgelines and 2024-2025 Passports with… |
| A26-001 | Service bulletin | Feb 1, 2026 | Service Bulletin - The piston ring function deteriorates due to ring low wear toughness and sticking from sludge. Oil adheres to the spark p… |
| ATI&07312025905 | Other | Aug 1, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023-2025 Odysseys, Passports, and Ridgelines with a customer… |
| ONL6Z6072025 | Other | Jul 29, 2025 | Owner Notification Letter - the piston ring function can deteriorate due to ring low wear toughness and sticking from sludge. Oil adheres to… |
| ATI&07152025901 | Other | Jul 15, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023-2025 Odysseys, Passports, and Ridgelines with a customer… |
| AEBM06172025901 | Other | Jun 17, 2025 | Dealer Message - Piston ring effectiveness may be reduced due to excessive wear and oil sludge build-up, which can cause oil to adhere to th… |
| ATI&05212025902 | Other | May 21, 2025 | Dealer Message - American Honda Motor Co., Inc. (AHM) is searching for certain 2023-2025 Odysseys, Passports, Pilots, and Ridgelines with a… |
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 A25-061 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 A25-061 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 A25-061 cover?
The manufacturer filed it against 2 model years: 2017 Honda Odyssey, 2016 Honda Odyssey. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.