Mazda bulletin 05-001-25a
What it saysSome customers may see the A/T warning light on during (or immediately after) engine start-up with DTCs P073D:00-TCM / P1738:00-TCM stored. NHTSA’s full summary ↓
Mazda filed this with NHTSA as a service bulletin dated Nov 23, 2025, received Dec 4, 2025, about the power train. It names 6 model years (2023–2025). 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 communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Some customers may see the A/T warning light on during (or immediately after) engine start-up with DTCs P073D:00-TCM / P1738:00-TCM stored. P073D:00-TCM: Turbine/input shaft speed sensor: Sensor output range malfunction P1738:00-TCM: Automatic transaxle internal malfunction This concern is caused by improper TCM logic. To eliminate this concern, the TCM control software has been modified to change the DTC detection logic, preventing DTC judgment during start-up.
Trouble codes it names: P073D P1738 P2610 1 of 3 read from the document itself
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 05-001-25a | Service bulletin | Nov 23, 2025 | 11026094 | PDF, 186 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 5555-21-100 | — | — | eBay Motors → |
Read by machine from the document NHTSA serves (3 pages), read Sep 30, 2026. A part number is shown only where it matches Mazda’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 6 model years this bulletin names have filed 114 complaints with NHTSA since 2015. 6 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.
Transmission failure when driving. Car was towed to dealership and diagnosed. Transmission and torque converter replacement required under factory warranty. Very long lead time for dealer to acquire replacement parts, about 4 months
2023 Mazda Mazda3 · Power Train · filed with NHTSA Mar 13, 2026
left-most lane of a three-lane highway, I pressed the accelerator to maintain the flow of traffic. The vehicle suddenly began revving between 4,000–5,000 RPM without increasing speed.
2024 Mazda Mazda3 · Power Train · filed with NHTSA Feb 19, 2026
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 power train
Source: same model, same component group18 other manufacturer communications filed against these Mazda models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Mazda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 01-008-26 | Service bulletin | May 1, 2026 | This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 01-008/23 06/05/23 Some vehicles ma… |
| 01-003-26a | Service bulletin | May 1, 2026 | This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. 01-003/26 01/30/26 Some vehicl… |
| SA-029-26 | Service bulletin | Apr 21, 2026 | This Service Alert supersedes the previously issued SA listed below: The changes are noted in Red. SA-011/24 02/12/24, 06/06/24, 07/29/24 DE… |
| 01-007-26 | Service bulletin | Apr 2, 2026 | Some vehicles may exhibit the check engine light ON with DTC P2112… |
| SA-056-25 | Service bulletin | Nov 27, 2025 | When inspected, the differential or PTO oil is dark or black. This is considered normal and NO repair should be performed. During production… |
| SA-040-25a | Service bulletin | Nov 18, 2025 | A New Automatic Transmission Fluid (ATF-A7) is being used for some 2023-2026 models. ATF-A7 is an extremely low viscosity formulation with l… |
| SA-040-25 | Service bulletin | Aug 27, 2025 | A New Automatic Transmission Fluid (ATF-A7) is being used for some 2023-2026 models. ATF-A7 is an extremely low viscosity formulation with l… |
| 05-001-25 | Service bulletin | May 22, 2025 | Some customers may see the A/T warning light on during (or immediately after) engine start-up with DTC P073D:00-TCM stored. P073D:00-TCM: Tu… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mazda, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Mazda 05-001-25a 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 05-001-25a 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 05-001-25a cover?
The manufacturer filed it against 6 model years: 2025 Mazda CX-30, 2024 Mazda CX-30, 2023 Mazda CX-30, 2025 Mazda Mazda3, 2024 Mazda Mazda3, 2023 Mazda Mazda3. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: 2023-2025 CX-30 (Mexico built): built before 21 Apr 2025; 2023-2025 Mazda3 (Japan built): built before 21 Apr 2025; 2023-2025 Mazda3 (Mexico built): built before 21 Apr 2025 — the build date is on the certification label in the driver’s door jamb.