Hyundai bulletin 23-01-049H
What it saysThis bulletin provides instructions to correct a condition with BSC-1 blue coolant flow restriction by debris causing abnormal high EWP (electric water pump) speed in certain 2020-21MY Ioniq Electric (AE EV) and 2019-22… NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Jun 8, 2023, received Jun 30, 2023, about the engine. It names 6 model years (2019–2022). 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 instructions to correct a condition with BSC-1 blue coolant flow restriction by debris causing abnormal high EWP (electric water pump) speed in certain 2020-21MY Ioniq Electric (AE EV) and 2019-22 Kona Electric (OS EV) models. Vehicle symptoms may include "Coolant supplement” or “Refill Inverter Coolant" warning light On. No related DTC are found stored. Normal inverter coolant reservoir tank level is confirmed. Special tools are required for this campaign to flush and clean debris from different cooling system circuits. The coolant will be replaced by updated BSC-2 low conductivity blue coolant.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-01-049H | Service bulletin | Jun 8, 2023 | 10238352 | PDF, 2,469 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 00232-19113 | Gallon bottles | — | eBay Motors → |
Read by machine from the document NHTSA serves (27 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 6 model years this bulletin names have filed 769 complaints with NHTSA since 2015. 476 of them name Engine, Power Train — 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 2019 Hyundai Kona, the 49 owners who gave an odometer reading for Engine reported it at a median of 70,000 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
The recall for my 2019 Hyundai Kona was issued 28 Apr 2021. It is now the middle of July 2021. How long should Hyundai owners need to wait for a remedy? I feel unsafe even driving this vehicle knowing it could possibly blow up. As of 7/12/2021, no remedy is listed. I have called my local dealer and they say the same, no remedy yet
2019 Hyundai Kona · Engine · filed with NHTSA Jul 12, 2021 · ODI 11424378
The contact owns a 2021 Hyundai Ioniq Hybrid. The contact stated that upon depressing the accelerator pedal, there was an abnormal ratting sound coming from the vehicle, and the vehicle failed to accelerate as needed. The contact stated that the check engine and oil warning lights were illuminated on the instrument panel.
2021 Hyundai Ioniq · Engine · filed with NHTSA May 8, 2025 · ODI 11659724
My wife was pulling into a parking place at Home Depot when the car suddenly accelerated, jumped the curb & hit a tree on the sidewalk. It did significant damage to the front bumper of the car but the airbags did not deploy & my wife was not hurt. I am guessing that it will be several thousand dollars to repair
2020 Hyundai Kona · Engine · filed with NHTSA Jun 17, 2025 · ODI 11667507
In depth: 2021 Hyundai Kona engine problems → · 2020 Hyundai Kona engine problems → · 2019 Hyundai Kona 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 group14 other manufacturer communications filed against these Hyundai models 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… |
| 9D1 | Service campaign | Sep 22, 2026 | Certain Kona (OS) vehicles equipped with the 1.6T-GDI engine may exhibit elevated engine-out emissions that may not meet engine-out NOx… |
| 26-FL-003H | Service bulletin | Jul 1, 2026 | Some Kona (SX2) vehicles equipped with the 1.6L T‑GDI engine may exhibit false “engine left idling” notifications in the MyHyundai app, even… |
| 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… |
| 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… |
| T9E | Service campaign | Sep 23, 2025 | Certain IONIQ Electric (AE EV) and Kona Electric (OS EV) vehicles may exhibit a restricted coolant flow condition, which may be accompanied… |
| 24-EM-010H | Service bulletin | Dec 19, 2024 | Certain Elantra N (CN7 N), Kona N (OS N), and Veloster N (JS N) vehicles may have DTC P1326 set due to water intrusion in the knock sensor c… |
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 23-01-049H 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 23-01-049H 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 23-01-049H cover?
The manufacturer filed it against 6 model years: 2021 Hyundai Ioniq, 2020 Hyundai Ioniq, 2022 Hyundai Kona, 2021 Hyundai Kona, 2020 Hyundai Kona, 2019 Hyundai Kona. 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: 2019 -2022MY Kona EV (OS EV): built 7 May 2019 – 12 Oct 2021; 2020 -2021MY Ioniq EV (AE EV): built 1 Nov 2019 – 17 May 2021 — the build date is on the certification label in the driver’s door jamb.