Hyundai bulletin 26-FL-002H
What it saysSome Sonata Hybrid (DN8 HEV) vehicles may display a Check Engine light and store one or more of the DTCs listed below due to an abnormal air-fuel ratio in a specific cylinder. NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Jun 3, 2026, received Jun 16, 2026, about the fuel/propulsion system — 1 document under this number: 26-FL-002H TSB. It names 3 model years (2024–2026). 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 Sonata Hybrid (DN8 HEV) vehicles may display a Check Engine light and store one or more of the DTCs listed below due to an abnormal air-fuel ratio in a specific cylinder. This bulletin provides instructions to update the Engine Control Module (ECM) to resolve the air-fuel ratio logic.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 26-FL-002H TSB | Service bulletin | Jun 3, 2026 | 11033838 | PDF, 364 KB |
What the document itself lists
The manufacturer titles it “ECM SOFTWARE UPDATE FOR AIR-FUEL RATIO”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 39116-2J031 | — | — | |
| 39116-2J037 | — | — | |
| 39116-2J038 | ECM SOFTWARE UPDATE FOR AIR-FUEL RATIO LOGIC IMPROVEMENT – DTC P219X00 | — | eBay Motors → |
Read by machine from the document NHTSA serves (5 pages), read Sep 29, 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 90 complaints with NHTSA since 2015. 2 of them name Fuel/Propulsion 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.
the gas tank is loose upon pumping gas it was found loose today the red mccombs dealership is the only service company who has performed service on vehicle
2025 Hyundai Sonata · Fuel/Propulsion System · filed with NHTSA Jan 10, 2026 · ODI 11710046
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 fuel/propulsion system
Source: same model, same component group4 other manufacturer communications filed against the Hyundai Sonata under the same component group (fuel/propulsion system), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26-FL-001H | Service bulletin | Jan 7, 2026 | Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI fuel injectors leaki… |
| 25-FL-001H | Service bulletin | Jan 9, 2025 | Some vehicles equipped with a 2.5L GDI Theta III engine (non-Turbo) may exhibit one or more misfire DTCs due to the GDI injectors leaking in… |
| 25-01-001H | Service campaign | Jan 3, 2025 | Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have DTC P0451 stored in the ECU. Follow this bulletin to inspec… |
| 9B1 | Service campaign | Dec 10, 2024 | Certain 2021-2023MY Sonata (DN8) and 2020-2022MY Sonata (DN8A) vehicles may have Diagnostic Trouble Code (DTC) P0451 stored in the Electroni… |
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 26-FL-002H 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 26-FL-002H 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 Hyundai warranty extension on file lists the ones Hyundai has filed.
Which vehicles does 26-FL-002H cover?
The manufacturer filed it against 3 model years: 2026 Hyundai Sonata, 2025 Hyundai Sonata, 2024 Hyundai Sonata. 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: 2024 – 2026 Sonata Hybrid (DN8 HEV): built 12 Dec 2023 – 24 Nov 2025 — the build date is on the certification label in the driver’s door jamb.