Hyundai bulletin 24-EV-001H
What it saysThis bulletin provides the procedure to update the ECU software on certain 2021-2022MY IONIQ Plug-in Hybrid (AE PHEV) vehicles that may exhibit a warning light with DTC U1341 due to communication issues… NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service bulletin dated Mar 12, 2024, received Apr 2, 2024, about the electrical system. It names 2 model years (2021–2022). 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 communicationThis bulletin provides the procedure to update the ECU software on certain 2021-2022MY IONIQ Plug-in Hybrid (AE PHEV) vehicles that may exhibit a warning light with DTC U1341 due to communication issues with the Integrated Electronic Brake (IEB) during charging in IG3 mode. Follow the procedure in this TSB to update the ECU software logic. ⢠DTC Info: U1341 - ECU-IEB Communication Delay
Trouble codes it names: U1341
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 24-EV-001H | Service bulletin | Mar 12, 2024 | 10252364 | PDF, 284 KB |
What the document itself lists
The manufacturer titles it “ECU SOFTWARE UPDATE FOR DTC U1341”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 39110-03918 | — | — | |
| 39110-03932 | Manual Mode Password | — | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 39110F | H1 ECU Update | 0.3 hrs |
Read by machine from the document NHTSA serves (3 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 47 complaints with NHTSA since 2015. 19 of them name Electrical 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.
VEHICLE SAFETY HAZARD: ACTIVE HIGH-VOLTAGE ISOLATION FAULT (DTC P0AA6) WITH DECEPTIVE DEALER/MANUFACTURER BYPASS & CONCEALMENT. On April 15, 2026, the dealer scanned my 2021 Ioniq EV and uncovered DTC P0AA6 (Hybrid/EV Battery Voltage System Isolation Fault), which denotes a catastrophic high-voltage leak into the chassis.
2021 Hyundai Ioniq · Electrical System · filed with NHTSA Jul 16, 2026 · ODI 11750854
Auto Hold/EPB lights come one while driving. Deactivates cruise control of on. Turns off auto hold. Ongoing issue with many reports but no recall or dealership knowledge. Ongoing issue since purchase
2021 Hyundai Ioniq · Electrical System · filed with NHTSA Jul 31, 2025 · ODI 11677617
Electric parking break and auto hold sensor lights on dash, manual indicates malfunction. Hyundai service center has investigated and replaced the faulty sensor but issue still remains
2022 Hyundai Ioniq · Electrical System · filed with NHTSA Mar 14, 2026 · ODI 11724369
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 electrical system
Source: same model, same component group9 other manufacturer communications filed against the Hyundai Ioniq under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Hyundai list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26-GI-003H | Service bulletin | Oct 27, 2026 | This bulletin provides information related to the navigation and head unit software changes introduced in the 2026 2nd Navigation Map and So… |
| 9C5 | Service campaign | Sep 9, 2026 | Certain Kona Electric (OS EV) and Ioniq Electric (AE EV) vehicles are eligible for a Battery Management System (BMS) software update. This u… |
| 25-BE-020H | Service bulletin | Sep 30, 2025 | This bulletin provides information related to the changes introduced in the 2025 1st Navigation Map and Software Update. The changes may var… |
| TBW | Service campaign | Jul 9, 2025 | A software update is available for multiple vehicles equipped with either Display Audio 2.0V or the AVN 5th Gen Wide system. |
| 25-BE-002H | Service bulletin | May 16, 2025 | This bulletin provides information related to the changes introduced in the 2024 2nd Navigation Map and Software Update. The changes may var… |
| 9C1 | Service campaign | May 8, 2025 | Some vehicles may exhibit a loss of connectivity or interruptions in the middle of using Bluelink Service functions. This may be due to an i… |
| SERVICE CAMPAIGN TBW | Service campaign | Sep 12, 2024 | A software update is available for multiple vehicles equipped with either Display Audio 2.0V or the AVN 5th Gen Wide system. |
| 24-01-034H | Service bulletin | Apr 30, 2024 | This bulletin provides the procedure to update the BMS (Battery Management System), MCU (Motor Control Unit), VCULDC… |
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-EV-001H 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-EV-001H 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 24-EV-001H cover?
The manufacturer filed it against 2 model years: 2022 Hyundai Ioniq, 2021 Hyundai Ioniq. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.