Acura bulletin B25-042
What it saysWhen updating the Telematics Control Unit (TCU) with the i-HDS tool an Error message will appear. NHTSA’s full summary ↓
Acura filed this with NHTSA as a service bulletin dated Nov 11, 2025, received Dec 4, 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationService bulletin - When updating the Telematics Control Unit (TCU) with the i-HDS tool an Error message will appear.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| B25-042 | Service bulletin | Nov 11, 2025 | 11026113 | PDF, 421 KB |
What the document itself lists
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 0101D4 | Replace telematics control unit | 0.7 hrs |
Read by machine from the document NHTSA serves (3 pages), read Oct 4, 2026. A part number is shown only where it matches Acura’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 1 model year this bulletin names have filed 5 complaints with NHTSA since 2015.
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 group4 other manufacturer communications filed against the Acura ADX under the same component group (electrical system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| B26-005 | Service bulletin | Oct 14, 2026 | Service Bulletin - Siri stops working when touching the display to interact with Wireless CarPlay. Siri can also freeze when reading a text… |
| 8A050-3BH-AA31 | Over-the-air update | Aug 20, 2026 | Over the Air System Updates - 2025–26 ADX: Software Update for Audio System software version 8A050-3BH-AA31. |
| BBTS30565 | Other | Apr 7, 2026 | Tech Line Summary - The vehicle's infotainment system displays previously viewed SMS messages upon each ignition cycle, when the customer's… |
| BB29050 | Other | Aug 4, 2025 | Tech Line - Customers may experience error code S001 with their audio unit. The vehicle may also have DTC B2B05-92 CAN Gateway error stored… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Acura, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Acura B25-042 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 B25-042 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 B25-042 cover?
The manufacturer filed it against 1 model year: 2025 Acura ADX. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.