Mazda bulletin 09-001-23a
What it saysSome vehicles may exhibit an “In Vehicle Network Malfunction” message appearing in the instrument cluster with DTC U3000:04-TCU (Telematics communication unit internal malfunction) stored after the connected service… NHTSA’s full summary ↓
Mazda filed this with NHTSA as a service bulletin dated Dec 18, 2023, received Jan 6, 2024, about the equipment. It names 15 model years (2021–2023). 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 communicationSome vehicles may exhibit an “In Vehicle Network Malfunction” message appearing in the instrument cluster with DTC U3000:04-TCU (Telematics communication unit internal malfunction) stored after the connected service contract has been discontinued. This is caused by improper control software of the telematics communication unit (TCU). To eliminate this concern, the control software of the TCU has been modified
Trouble codes it names: U3000
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 09-001-23a | Service bulletin | Dec 18, 2023 | 10248394 | not found |
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 15 model years this bulletin names have filed 646 complaints with NHTSA since 2015. 75 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.
On 14th, 2026, while traveling at approximately 60 mph on the northbound 55 Freeway near the Katella exit, my vehicle suddenly began to shake violently without any prior warning. In response, I attempted to slow down by applying the brakes; however, the speedometer rapidly increased even as I maintained firm pressure on the brake pedal.
2023 Mazda Mazda3 · Electrical System · filed with NHTSA Jan 22, 2026
The contact owns a 2022 Mazda CX-9. The contact stated that the vehicle was being operated with the front driver's side seat warmer activated to the highest heat level. After driving for several hours, the vehicle was parked. While exiting the vehicle, the contact experienced pain in the rear thigh area of each leg.
2022 Mazda CX-9 · Electrical System · filed with NHTSA Apr 1, 2026
The vehicle's Connectivity Master Unit (CMU) / infotainment system has experienced a complete, permanent internal electronic failure, logged by Diagnostic Trouble Code DTC U3000:49 (Control Module Internal Electronic Failure). The main display screen is completely dark at all times and never powers on or responds.
2022 Mazda Mazda3 · Electrical System · filed with NHTSA Aug 11, 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 equipment
Source: same model, same component group23 other manufacturer communications filed against these Mazda models under the same component group (equipment), newest first. The eight newest are listed; the rest are on the Mazda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| CSP04 | Service campaign | Feb 19, 2026 | Customer Service Program (CSP) 04 – Connected Services Deactivated – All applicable Mazda vehicles. There is no Repair Procedure or Warrant… |
| 16-002-24 | Service bulletin | Apr 25, 2024 | Some customers may experience the following symptoms with these software versions: (7000C0A-NA12_10016) It may not be possible to connect t… |
| 16-001-24 | Service bulletin | Apr 19, 2024 | Some customers may experience the following symptoms with these software versions: (Ver. 7230C**-NA03_10022). The person on the line may hea… |
| SA-021-24 | Service bulletin | Apr 9, 2024 | Some customers may complain about intermittent audio no sound from the MAZDA CONNECT infotainment system and/or static noise from the speake… |
| SA-017-24 | Service bulletin | Mar 14, 2024 | Some customers may complain about any of the following: 1. Infotainment Center Display does not provide the Authorization Code (OTP) during… |
| ONP09 | Service bulletin | Mar 14, 2024 | Launch of Owner Notification Program ONP09 â 2023MY Mazda CX-50 Wind Noise from Roof Rack Crossbars. Mazda Motor Corporation has decided t… |
| SA-008-24 | Service bulletin | Feb 6, 2024 | Use the symptom troubleshooting tables below to diagnose MAZDA CONNECT concerns. |
| SA-005-24 | Service bulletin | Feb 1, 2024 | Customers may report no audio when using the infotainment fader function fully adjusted to the rear. If the customer's vehicle is among the… |
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 09-001-23a 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 09-001-23a 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 09-001-23a cover?
The manufacturer filed it against 15 model years: 2023 Mazda CX-30, 2022 Mazda CX-30, 2021 Mazda CX-30, 2023 Mazda CX-5, 2022 Mazda CX-5, 2021 Mazda CX-5 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.