Hyundai bulletin 23-EE-009H
What it saysThis bulletin provides warranty procedure for EGR Valve replacement related to DTC P0401 EGR Flow Insufficient on 2020 and 2021MY Sonata (DN8a) equipped with 2.5 GDI Vehicles. NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Aug 21, 2023, received Sep 6, 2023, about the engine. It names 2 model years (2020–2021). 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.
This bulletin provides warranty procedure for EGR Valve replacement related to DTC P0401 EGR Flow Insufficient on 2020 and 2021MY Sonata (DN8a) equipped with 2.5 GDI Vehicles.
Trouble codes it names: P0401
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-EE-009H | Service bulletin | Aug 21, 2023 | 10241875 | PDF, 265 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 28400-2S000FFF | VALVE ASSY-EGR | 1 | eBay Motors → |
| 28493-2S020 | GASKET-EGR PIPE | 1 | eBay Motors → |
| 28493-2S030 | GASKET – EGR PIPE | 1 | eBay Motors → |
| 28493-2S040 | GASKET – EGR PIPE | 1 | eBay Motors → |
| 28493-2S050 | GASKET – EGR COOLER | 1 | eBay Motors → |
| 28535-2SAD0 | GASKET-CATALYST CASE | 1 | eBay Motors → |
| 28751-3S100 | GASKET-EXHAUST PIPE | 2 | eBay Motors → |
| 28400-2S000 | — | — |
Read by machine from the document NHTSA serves (2 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 2 model years this bulletin names have filed 388 complaints with NHTSA since 2015. 99 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.
Initially had loss of cabin heat. Later, vehicle randomly overheated. Repair shop replaced EGR due to finding confidant buildup of water/coolant mix. Within one week, problem returned. Dealer notified me that while replacing another part they found a TSB for coolant leakage into exhaust that was consistent with my issue.
2021 Hyundai Sonata · Engine · filed with NHTSA Feb 13, 2024 · ODI 11571605
On July 15th I was driving away from work and my car suddenly stopped accelerating. I was able to get it towed to a body shop I previously had it repaired at. They said the battery system was blowing a fuse when it would become undrivable.
2020 Hyundai Sonata · Engine · filed with NHTSA Aug 22, 2024 · ODI 11610285
In depth: 2021 Hyundai Sonata 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 group18 other manufacturer communications filed against the Hyundai Sonata 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 |
|---|---|---|---|
| 26-EM-016H | Service bulletin | Oct 8, 2026 | Some vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin outlines the… |
| 26-EM-015H | Service bulletin | Oct 7, 2026 | Certain vehicles equipped with internal combustion engines may exhibit higher-than-expected engine oil consumption. This bulletin provides t… |
| 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… |
| T6G | Warranty extension | Mar 26, 2026 | This TSB references the Op codes to use for claim submission and the Parts required based on the vehicle’s inspection results from TSB 22-01… |
| T6G TXXM | Warranty extension | Mar 26, 2026 | This TSB references the Op codes to use for claim submission and the Parts required based on the vehicle’s inspection results from TSB 22-01… |
| 26-EM-003H | Service bulletin | Feb 5, 2026 | Some Sonata (DN8, DN8A) vehicles may have DTCs P218100, P2181F0, and/or P2181F1 (Cooling System Performance) set in the Engine Control Modul… |
| 25-EM-007H | Service bulletin | Dec 18, 2025 | Some Elantra (CN7, CN7A), Kona (OS, SX2), and Sonata Hybrid (DN8 HEV) vehicles equipped with 2.0L engines may illuminate a warning lamp for… |
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 23-EE-009H 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 23-EE-009H 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 23-EE-009H cover?
The manufacturer filed it against 2 model years: 2021 Hyundai Sonata, 2020 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: built 22 Oct 2019 – 1 Oct 2020 — the build date is on the certification label in the driver’s door jamb.