Honda bulletin A25-054
What it saysCustomers are experiencing issues with OnStar and HondaLink due to the software within the telematics control unit needing a software update. NHTSA’s full summary ↓
Honda filed this with NHTSA as a service bulletin dated Aug 1, 2025, received Aug 8, 2025, about the electrical system. It names 1 model year (2025). 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 Prologue 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 - Customers are experiencing issues with OnStar and HondaLink due to the software within the telematics control unit needing a software update.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| A25-054 | Service bulletin | Aug 1, 2025 | 11021755 | PDF, 329 KB |
What the document itself lists
Labour operations and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 0520A0 | Inspect software - no update | 0.2 hrs |
| 0525A5 | K73 Telematics control module reprogramming (includes inspection) | 0.5 hrs |
Read by machine from the document NHTSA serves (6 pages), read Sep 30, 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 Prologue
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 1 model year this bulletin names have filed 150 complaints with NHTSA since 2015. 32 of them name Electrical System — 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.
While driving I received a warning that said “ service high voltage system” that came up on my dashboard. I have had my vehicle just for a couple of months and this is the second issue that I am having with the vehicle since purchasing it.
2025 Honda Prologue · Electrical System · filed with NHTSA Nov 24, 2025
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 electrical system
Source: same model, same component group10 other manufacturer communications filed against the Honda Prologue under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Honda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| ONL6WM092026P | Other | Sep 25, 2026 | Owner Notification Letter - Certain 2024 Prologue vehicles may have improperly installed, or missing cavity plugs from the rear chassis harn… |
| AEBM06262026902 | Other | Jun 26, 2026 | Dealer Message - Due to improper manufacturing, the rear chassis harness connector may not be properly sealed and only partially seated. An… |
| A26-032 | Service bulletin | Jun 26, 2026 | Service Bulletin - Certain 2024 Prologue vehicles may have improperly installed or missing cavity plugs from the rear chassis harness electr… |
| ONL6MH04202024 | Other | Apr 20, 2026 | Owner Notification Letter - The software update includes several system improvements designed to enhance the functionality of certain vehicl… |
| APOC04172026901 | Other | Apr 17, 2026 | Dealer Message -American Honda is requesting parts in support of a quality investigation related to Rear View Camera part number 86583111. A… |
| AEBM04012026905 | Other | Apr 2, 2026 | Dealer Message - During the manufacturing process, insufficient silicone was applied to the DC-DC converter which may lead to excessive heat… |
| A26-051 | Service bulletin | Apr 2, 2026 | Service Bulletin - Insufficient silicone application to the DC-DC converter can result in excessive heat exposure during charging, leading t… |
| A25-051 | Service bulletin | Aug 1, 2025 | Service Bulletin - The A11 Radio Control Module requires an update due to various electronic issues. |
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 A25-054 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 A25-054 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 A25-054 cover?
The manufacturer filed it against 1 model year: 2025 Honda Prologue. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.