Hyundai bulletin 24-FL-004H
What it saysThis bulletin provides the procedure to update the Engine Control Module (ECM) and the Transmission Control Module (TCM) for 2021-2023MY Santa Fe (TMa) vehicles to improve operation of the Idle Stop and Go (ISG) system. NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Dec 18, 2024, received Dec 21, 2024, about the engine. It names 3 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 communicationThis bulletin provides the procedure to update the Engine Control Module (ECM) and the Transmission Control Module (TCM) for 2021-2023MY Santa Fe (TMa) vehicles to improve operation of the Idle Stop and Go (ISG) system. Under certain circumstances the vehicle may not restart after the ISG system has engaged and requires a manual restart due to the lack of intake manifold pressure recovery.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-FL-004H | Service bulletin | Dec 18, 2024 | 11012042 | PDF, 304 KB |
What the document itself lists
The manufacturer titles it “ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 39110-2S059 | — | — | |
| 39110-2S067 | — | — | |
| 39110-2S060 | — | — | |
| 39110-2S068 | — | — | |
| 39110-2S092 | — | — | |
| 39110-2S093 | — | — | |
| 39110-2S094 | — | — | |
| 39110-2S095 | — | — | |
| 39110-2S274 | STM4G25NH | — | |
| 39110-2S275 | STM2G25NH | — | |
| 39110-2S276 | STM4G25NH | — | |
| 39110-2S277 | STM4G25NH | — | |
| 39110-2S298 | — | — | |
| 39110-2S299 | — | — | |
| 39110-2S300 | — | — | |
| 39110-2S301 | ECU/TCU SOFTWARE UPDATE FOR ISG LOGIC IMPROVEMENT | — | eBay Motors → |
Read by machine from the document NHTSA serves (6 pages), read Sep 30, 2026. A part number is shown only where it matches Hyundai’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 3 model years this bulletin names have filed 736 complaints with NHTSA since 2015. 182 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.
The contact owns a 2021 Hyundai Santa Fe. The contact stated while driving 50 MPH, the vehicle failed to respond while the accelerator pedal was depressed. The vehicle was taken to a local dealer where it was diagnosed that the camshaft sensor needed to be replaced.
2021 Hyundai Santa Fe · Engine · filed with NHTSA Jul 8, 2024
2022 Hyundai Santa Fe Plug-in Hybrid, confirming the exact symptom “the gasoline engine continues running after the vehicle is switched off.” the vehicle is on and your burn fuel and if the fuel tank is full then some major issue may occur
2022 Hyundai Santa Fe · Engine · filed with NHTSA Aug 6, 2026
While on the highway my car lost power, gradually slowing down to a stall. I was able to safely park on the side of the road. I got the car to a nearby dealership that kept it for 10 days.
2023 Hyundai Santa Fe · Engine · filed with NHTSA Feb 18, 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 engine
Source: same model, same component group18 other manufacturer communications filed against the Hyundai Santa Fe under the same component group (engine), newest first. The eight newest are listed; the rest are on the Hyundai list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 9C2 | Service campaign | May 21, 2026 | Certain 2019 – 2020 model year Santa Fe, 2017 – 2018 model year Santa Fe Sport, 2015 – 2019 model year Sonata, and 2018 – 2021 model year Tu… |
| 26-EE-003H | Service bulletin | Apr 18, 2026 | Some vehicles may exhibit difficulty starting in cold weather. This bulletin provides the procedure to perform an inspection on the starter… |
| TXX8 | Warranty extension | Feb 11, 2026 | Certain 2013 – 2019 model year Santa Fe/Santa Fe XL vehicles equipped with 3.3L Lambda II GDI engines may experience abnormal engine noise o… |
| 26-EM-005H | Service bulletin | Feb 5, 2026 | Some Santa Fe (TMA) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Electronic Control Unit… |
| 9C3 | Service campaign | Oct 30, 2025 | Certain 2025MY Santa Cruz (NXT) and Santa Fe (MX5A) vehicles equipped with the 2.5T-GDI Theta III engine may exhibit coolant residue on the… |
| T9L | Service campaign | Sep 23, 2025 | Certain Santa Fe Hybrid (TM HEV) and Tucson Hybrid (NX4 HEV) vehicles may exhibit a restricted coolant flow condition, which may be accompan… |
| T9F | Service campaign | Sep 23, 2025 | Certain Santa Fe Plug-in Hybrid (TM PHEV) and Tucson Plug-in Hybrid (NX4 PHEV) vehicles may exhibit a restricted coolant flow condition, whi… |
| HSE25-12-P270 | Warranty extension | Aug 15, 2025 | The warranty coverage of certain engines for repairs and replacement has been extended to 15 years or 150,000 miles (15years or 240,000km) f… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Hyundai, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Hyundai 24-FL-004H 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 24-FL-004H 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 24-FL-004H cover?
The manufacturer filed it against 3 model years: 2023 Hyundai Santa Fe, 2022 Hyundai Santa Fe, 2021 Hyundai Santa Fe. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.