Mazda bulletin 01-005-24a
What it saysSome customers may experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: Engine takes longer to warm up. NHTSA’s full summary ↓
Mazda filed this with NHTSA as a service bulletin dated Jun 28, 2024, received Jul 5, 2024, about the engine. It names 25 model years (2018–2024). 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 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 experience a check engine light ON with DTC P0126:00 (Thermostat stuck open) and one or more of the following symptoms: Engine takes longer to warm up. Engine temperature gauge fluctuates. Low coolant temperature indicator (blue) light stays on longer or turns on while driving. Poor heater performance, especially at idle. NOTE: Vehicles with SKYACTIV-G 2.5T are not applicable to this service information. If DTC P2B61:00 (Coolant control valve circuit range/performance) accompanies DTC P0126:00, this TSB is not applicable. Diagnose DTCs according to the instructions on MGSS online.
Trouble codes it names: P0126 P2B61
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 01-005-24a | Service bulletin | Jun 28, 2024 | 11003350 | PDF, 781 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| PYY2-15-SA1 | THERMOSTAT SET 1 --- GASKET,WATER OUTLET 1 [R] for Lower radiator hose component | — | eBay Motors → |
| PYFB-15-169 | GASKET,WATER OUTLET 1 [R] for Lower radiator hose component | — | eBay Motors → |
| PE13-15-296 | CONNECTOR 1 [R] for water hose for A/T oil cooler | — | eBay Motors → |
| 0000-77-508F | COOLANT | — |
Read by machine from the document NHTSA serves (7 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 25 model years this bulletin names have filed 1,588 complaints with NHTSA since 2015. 592 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.
On the 2018 Mazda CX-5, the 29 owners who gave an odometer reading for Engine reported it at a median of 28,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Low Engine Oil Light keeps appearing at seemingly random intervals. I will heat up my vehicle, begin driving, and sometimes after 10 minutes, sometimes after 20 minutes it will come on. I drove 2.5 hours and it did not come on at all. It first started Friday 11/29 and was driven to and from a few places and came on 50% of the time.
2020 Mazda CX-30 · Engine · filed with NHTSA Dec 3, 2024
The engine on my 2022 naturally aspirated Mazda CX5, is making a loud ticking noise when cold started. The vehicle is in pristine condition and is services regularly at the dealer with only 33,000 miles. The ticking noise is a known issue for this make and model, where Mazda has issued a TSB for faulty hydraulic valve lash.
2022 Mazda CX-5 · Engine · filed with NHTSA Dec 23, 2024
My 2023 Mazda 3 started to have a more terrible and annoying rattle after 3000 miles. The engine will resonate and knock when it reaches a certain speed. The slow speed light throttle acceleration rattles. The most annoying thing is the multiple rattles inside, dash, door panels, and roof. It is like a can in the summer.
2023 Mazda Mazda3 · Engine · filed with NHTSA Nov 30, 2024
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 group60 other manufacturer communications filed against these Mazda models 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 |
|---|---|---|---|
| SA-060-26 | Service bulletin | Oct 1, 2026 | NOTE: This service information only applies to vehicles with PYUKD engine and EGR. DESCRIPTION DTC P0402 EGR malfunctions may be falsely det… |
| 01-010-26 | Service bulletin | Aug 10, 2026 | This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red text. 01-012/22 10/06/22 DESCRIPTION S… |
| SA-048-26 | Service bulletin | Aug 6, 2026 | Some vehicle may exhibit the CHECK ENGINE light on with DTC P0524 (Engine oil pressure control system: Oil pressure decrease) and no abnorma… |
| 09-019-26 | Service bulletin | Jun 18, 2026 | This bulletin supersedes the previously issued bulletin(s) listed below. The changes are noted in Red. 09-012/21 12/13/21, 06/10/21 and 04/2… |
| SA-017-26c | Service bulletin | Jun 17, 2026 | This Service Alert supersedes the previously issued SA(s) listed below. The changes are noted in Red. SA-017/26 05/20/26 and 03/17/26 DESCRI… |
| SSPD5 | Warranty extension | Apr 29, 2026 | SPECIAL SERVICE PROGRAM - SSPD5 - WARRANTY EXTENSION - MULTI-MODEL - VALVE STEM SEALS CLASS ACTION In conjunction with a Class Action Settle… |
| 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… |
| DRW59 | Service campaign | Mar 25, 2026 | Subject: Notification of Dealer Re-Work (DRW59) – 2026MY CX-30 and 2026MY Mazda3 - Check Engine Light On With DTC P0126:00 Dear Mazda Deale… |
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 01-005-24a 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 01-005-24a 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 01-005-24a cover?
The manufacturer filed it against 25 model years: 2021 Mazda CX-3, 2020 Mazda CX-3, 2019 Mazda CX-3, 2024 Mazda CX-30, 2023 Mazda CX-30, 2022 Mazda CX-30 and more. 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: built before 8 Jul 2022; built before 24 Aug 2020; built before 12 Nov 2021 — the build date is on the certification label in the driver’s door jamb.