Mazda bulletin SSPD4a
What it saysOBD II Water Temp Sensor Detection Concern: The second water temperature sensor circuit failure may not be diagnosed correctly and also the execution rate of the evaporative monitor in the field may not be calculated… NHTSA’s full summary ↓
Mazda filed this with NHTSA as a service bulletin dated Dec 27, 2023, received Jan 4, 2024, about the engine. It names 1 model year (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 communicationSSPD4- 2024 CX-90 (MHEV) - OBD II Water Temp Sensor Detection Concern: The second water temperature sensor circuit failure may not be diagnosed correctly and also the execution rate of the evaporative monitor in the field may not be calculated correctly. The repair will be reprogramming the PCM with the modified software with MMDS, using MDARS. There are 9,991 vehicles in the campaign.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| SSPD4a | Service bulletin | Dec 27, 2023 | 10248297 | 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 1 model year this bulletin names have filed 465 complaints with NHTSA since 2015. 84 of them name Engine — 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.
Vehicle is in normal mode with EV mode engaged, car is going 70mph and suddenly accelerator stops working and decelerates to ~60mph until vehicle suddenly aggressively switches to gas mode and accelerates again
2024 Mazda CX-90 · Engine · filed with NHTSA Jan 30, 2024 · ODI 11568848
In depth: 2024 Mazda CX-90 engine problems →
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 engine
Source: same model, same component group54 other manufacturer communications filed against the Mazda CX-90 under the same component group (engine), newest first. The eight newest are listed; the rest are on the Mazda list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PF-26-04 | Other | Sep 30, 2026 | SUBJECT: ORDERING REQUIREMENT FOR AT COMPONENTS FOR H3T (INLINE 6) Use this guide before ordering or replacing an AT component on applicabl… |
| SA-061-26 | Service bulletin | Sep 17, 2026 | DESCRIPTION Use this guide before ordering or replacing an AT component on applicable H3T vehicles. QUICK CHECKLIST BEFORE ORDERING Confirm… |
| SA-059-26 | Service bulletin | Sep 10, 2026 | This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-029/24 05/09/24 DESCRIPTION The CX… |
| SA-038-26a | Service bulletin | Sep 4, 2026 | This Service Alert supersedes the previously issued service alert listed below. The changes are noted in Red text. SA-038/26 06/15/26 DESCR… |
| SA-058-26 | Service bulletin | Aug 26, 2026 | This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-001/25 10/16/25, 05/15/25, 04/17/25… |
| SA-041-26 | Service bulletin | Jun 19, 2026 | This SA supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-061/25 12/17/25 DESCRIPTION If you encounter a… |
| 01-002-26a | Service bulletin | Jun 12, 2026 | This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 01-002/26 01/07/26 DESCRIPTION Some v… |
| SA-026-26 | Service bulletin | Apr 16, 2026 | This Service Alert supersedes the previously issued M-Tip(s) listed below. The changes are noted in Red text. MT-002/19 09/30/19 and 12/19/1… |
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 SSPD4a 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 SSPD4a 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 SSPD4a cover?
The manufacturer filed it against 1 model year: 2024 Mazda CX-90. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.