Mazda bulletin SA-027-23c
What it saysIn-Vehicle Network Malfunction error message and Master Warning light ON with DTC U3000:04 (Telematics communication unit internal malfunction) stored. NHTSA’s full summary ↓
Mazda filed this with NHTSA as a service bulletin dated Nov 14, 2023, received Dec 5, 2023, about the equipment adaptive/mobility. It names 19 model years (2021–2024). 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 communicationIn-Vehicle Network Malfunction error message and Master Warning light ON with DTC U3000:04 (Telematics communication unit internal malfunction) stored.
Trouble codes it names: U3000
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SA-027-23c | Service bulletin | Nov 14, 2023 | 10246210 | PDF, 279 KB |
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 19 model years this bulletin names have filed 787 complaints with NHTSA since 2015. 100 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 · ODI 11712753
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 · ODI 11728503
I was denied work on a network issue recall 3 separate times at the dealership I bought the car. The first time I was told it was because of a smell. If I clean the car, they will fix it. I noticed after they were in the car my backup camera didn’t work which I also thought might be a recall but found out it wasnt.
2024 Mazda Mazda3 · Electrical System · filed with NHTSA Aug 7, 2026 · ODI 11755539
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 adaptive/mobility
Source: same model, same component group12 other manufacturer communications filed against these Mazda models under the same component group (equipment adaptive/mobility), newest first. The eight newest are listed; the rest are on the Mazda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| SA-027-24 | Service bulletin | Apr 26, 2024 | Some customers may complain about infotainment center display. Peeling, spider cracks and white dots. |
| SA-007-24a | Service bulletin | Apr 2, 2024 | This information will give you the necessary knowledge to respond to customers concerns of Smart Brake Support (SBS) unintended braking. By… |
| SA-006-24 | Service bulletin | Feb 1, 2024 | Customers having MAZDA CONNECT concerns should have their vehicle repaired using the following repair procedure. |
| 09-002-24 | Service bulletin | Jan 10, 2024 | Some customers may complain that the warning sound in the passenger compartment (notifies i-ACTIVSENSE warnings, seat belt warning etc.) is… |
| SSPD1-D4b | Service bulletin | Nov 17, 2023 | RECALL 6223J, 6323J, SSPD1, SSPD2, SSPD3, SSPD4 - MULTIPLE CAMPAIGNS REPAIR PROCEDURE AND MULTIPLE MODULE REPROGRAMMING. |
| 09-023-23a | Service bulletin | Sep 28, 2023 | Some customers may experience the following symptoms of the wireless charger (Qi), even when the mobile device (smartphone etc.) is placed i… |
| 09-032-23 | Service bulletin | Sep 22, 2023 | SERVICE BULLETIN 09-031/20 ISSUED ON 09/21/20 IS NO LONGER VALID. IT IS SUPERCEDED BY RECALL 6023G… |
| 16-007-23 | Service bulletin | Jul 25, 2023 | Updated software release for concerns with MAZDA CONNECT infotainment system. Some vehicles may experience the symptoms mentioned below, whi… |
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 SA-027-23c 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 SA-027-23c 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 Mazda warranty extension on file lists the ones Mazda has filed.
Which vehicles does SA-027-23c cover?
The manufacturer filed it against 19 model years: 2024 Mazda CX-30, 2023 Mazda CX-30, 2022 Mazda CX-30, 2021 Mazda CX-30, 2024 Mazda CX-5, 2023 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.