Honda bulletin A23-074
What it saysVehicle shows Transmission Temperature Too Hot on the MID with no related DTCs due to ATF deterioration causing high foaming and low viscosity. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Aug 15, 2023, received Aug 23, 2023, about the power train. It names 3 model years (2017–2019). 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 - Vehicle shows Transmission Temperature Too Hot on the MID with no related DTCs due to ATF deterioration causing high foaming and low viscosity. During extended high load driving ATF will foam and cooler flow rate is reduced.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A23-074 | Service bulletin | Aug 15, 2023 | 10241165 | PDF, 239 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 90471-PX4-000 | Drain Plug Washer (18mm) | 1 | eBay Motors → |
| 11107-PWA-300 | ATF Fill Sealing Washer (24mm) | 1 | eBay Motors → |
| 37805-5MJ-A56 | — | — | |
| 37820-5MJ-A580 | — | — | |
| 37805-5MJ-A570 | — | — | |
| 37820-5MJ-A780 | — | — | |
| 37805-5MJ-A770 | — | — | |
| 37820-5MJ-A080 | — | — | |
| 37805-5MJ-A070 | — | — | |
| 37820-5MJ-A620 | — | — | |
| 37805-5MJ-A620 | — | — | |
| 37820-5MJ-A820 | — | — | |
| 37805-5MJ-A820 | — | — | |
| 37820-5MJ-A120 | — | — | |
| 37805-5MJ-A120 | — | — | |
| 37820-5MJ-A420 | — | — | |
| 37805-5MJ-A420 | — | — | |
| 37820-5MJ-A920 | — | — | |
| 37805-5MJ-A920 | — | — | |
| 37820-5MJ-A220 | Page 2 of | — | eBay Motors → |
| 37805-5MJ-A220 | Page 2 of | — | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 1255E4 | Update the PGM-FI software | 0.2 hrs |
Read by machine from the document NHTSA serves (4 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 3 model years this bulletin names have filed 747 complaints with NHTSA since 2015. 88 of them name Power Train — 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 Ridgeline, the 13 owners who gave an odometer reading for Power Train reported it at a median of 43,000 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 Ridgeline. The contact stated that while driving and making a left turn, the vehicle failed to accelerated. No waring light illuminated. The contact stated that the failure occurred four times. The vehicle was not repaired. The manufacturer was not made aware of the failure.
2019 Honda Ridgeline · Power Train · filed with NHTSA Feb 7, 2020 · ODI 11307666
I had a trans lite on the dash and overheating issues in the (6 speed) transmission at about 61000 miles. The issue started with a juddering vibration that was reported to the dealer at 39000 miles.
2018 Honda Ridgeline · Power Train · filed with NHTSA Apr 23, 2020 · ODI 11322043
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.
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 A23-074 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 A23-074 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 A23-074 cover?
The manufacturer filed it against 3 model years: 2019 Honda Ridgeline, 2018 Honda Ridgeline, 2017 Honda Ridgeline. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.