Hyundai service campaign TDR
What it saysCertain 2024MY Kona Electric (SX2 EV) and 2023-2024MY IONIQ 5 (NE EV) vehicles are equipped with a Motor and Reduction Gear System, also known as Motor-Gear Driven Unit (MGDU), that may have received an incorrect amount… NHTSA’s full summary ↓
Hyundai filed this with NHTSA as a service campaign dated Jul 8, 2025, received Jul 15, 2025, about the power train — 1 document under this number: 25-01-042H TSB. It names 3 model years (2023–2024). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
Get the next Hyundai bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
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.
Certain 2024MY Kona Electric (SX2 EV) and 2023-2024MY IONIQ 5 (NE EV) vehicles are equipped with a Motor and Reduction Gear System, also known as Motor-Gear Driven Unit (MGDU), that may have received an incorrect amount of oil/fluid during manufacturing. In some cases, the motor and/or reduction gear can produce a grinding/whining noise during operation. Follow the procedures in this bulletin to drain the existing oil and replace it with new oil to resolve this condition.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 25-01-042H TSB | Service campaign | Jul 8, 2025 | 11020692 | PDF, 463 KB |
What the document itself lists
The manufacturer titles it “MOTOR & REDUCTION GEAR OIL REPLACEMENT”.
Parts the bulletin names
| Part number | Description | Qty |
|---|---|---|
| 45323-39000QQH | Gasket-Magnetic Plug | — |
| 04500-00125QQH | Front MGDU: 3 each | — |
Read by machine from the document NHTSA serves (5 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.
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.
Email me new Hyundai bulletins for one of these models
A weekly email, sent only in a week when Hyundai files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 3 model years this bulletin names have filed 682 complaints with NHTSA since 2015. 109 of them name 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.
Multiple people I know with 2024 Hyundai Kona AWD cars are having the same problem around 10k or so miles. The AWD is locking up. Car feels like rear wheels are slipping when turning and accelerating out of a full or partial stop. This is a widespread problem on this model and I am very surprised it is not a recall yet.
2024 Hyundai Kona · Power Train · filed with NHTSA Jun 23, 2025 · ODI 11668688
Our 8-mo old 9800 mile Ioniq 5 failed to maintain its 12v battery while parked for a week. It was dead when we came back to it. Jump started successfully. I replaced the OEM battery with an AGM battery, which the car failed to maintain charge on after 2 weeks.
2024 Hyundai Ioniq 5 · Power Train · filed with NHTSA Feb 2, 2025 · ODI 11640156
In depth: 2023 Hyundai Ioniq 5 transmission and drivetrain 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 power train
Source: same model, same component group11 other manufacturer communications filed against these Hyundai models under the same component group (power train), newest first. The eight newest are listed; the rest are on the Hyundai list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 26-AT-004H | Service bulletin | Jun 5, 2026 | This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed w… |
| LA9 | Warranty extension | Mar 17, 2026 | Certain IONIQ 5 (NEA EV) and IONIQ 9 (ME1A EV) vehicles (affected VINs listed below) may exhibit a high-frequency noise from the front motor… |
| TDW | Service campaign | Aug 29, 2025 | Certain 2025MY IONIQ 5 (NEA EV) vehicles are equipped with a Motor and Reduction Gear Motor-Gear Drive Unit (MGDU) differential gear assembl… |
| 24-AT-002H | Service bulletin | Apr 9, 2024 | This TSB provides a procedure to diagnose and replace, if necessary, an automatic transmission with Incorrect Ratio DTC… |
| 24-EV-003H | Service bulletin | Mar 6, 2024 | Certain 2022-2024 MY IONIQ 5 (NE1) and 2023MY IONIQ 6 (CE1) may have a condition of the power down warning light (turtle symbol) with "Power… |
| 23-01-073H-1 | Service bulletin | Oct 17, 2023 | Certain 19-23MY Kona Electric (OS EV) vehicles may experience a condition of EV warning light ON with Diagnostic Trouble Code (DTC) P1AA6 to… |
| 23-01-073H | Service bulletin | Aug 29, 2023 | Certain 19-23MY Kona Electric (OS EV) vehicles may experience a condition of EV warning light ON with Diagnostic Trouble Code (DTC) P1AA6 to… |
| 23-AT-013H | Service bulletin | Aug 28, 2023 | This bulletin provides information related to a Transmission Control Unit (TCU) software update for certain vehicles equipped with an 8-spee… |
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 TDR a recall?
No. A service campaign 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 TDR repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does TDR cover?
The manufacturer filed it against 3 model years: 2024 Hyundai Ioniq 5, 2023 Hyundai Ioniq 5, 2024 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: built 7 Dec 2022 – 23 Feb 2024; built 5 Oct 2023 – 16 Feb 2024 — the build date is on the certification label in the driver’s door jamb.