Honda bulletin A23-078
Honda filed this with NHTSA as a service bulletin dated May 21, 2025, received Sep 6, 2023, about the engine — 5 documents under this number. It names 6 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationService Bulletin - Torque converters may not have been manufactured to proper specifications. As a result, the torque converter lock-up clutch cannot provide adequate holding force due to pressure bleeding down through a crack in the lock-up piston. The reduced lock-up clutch capacity results in the transmission indicator flashing “D� and set DTC P0741 Torque Converter Clutch Performance or Stuck OFF.
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| A23-078 | Service bulletin | May 21, 2025 | 11019252 |
| A23-078 | Service bulletin | May 21, 2025 | 11019241 |
| A23-078 | Service bulletin | Apr 18, 2025 | 11017326 |
| A23-078 | Service bulletin | Oct 6, 2023 | 10244188 |
| A23-078 | Service bulletin | Aug 31, 2023 | 10241879 |
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 A23-078 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 A23-078 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 A23-078 cover?
The manufacturer filed it against 6 model years: 2019 Honda Pilot, 2018 Honda Pilot, 2017 Honda Pilot, 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.