2021-2022 Hyundai Transaxle ATF Leak TSB 22-AT-002H
Hyundai has issued Technical Service Bulletin (TSB) 22-AT-002H to address automatic transmission fluid (ATF) leaks from the rear cover of the 8-speed automatic transaxle in certain 2021-2022 Sonata, Santa Fe, and Tucson models. This leak is attributed to a porous casting.
Also applies to
- Hyundai Santa Fe
- 2021
- Hyundai Sonata
- 2021
Owners of certain 2021-2022 Hyundai Sonata, Santa Fe, and Tucson vehicles equipped with an 8-speed automatic transmission may experience an automatic transmission fluid (ATF) leak. This leak typically occurs at the rear cover of the transaxle. Hyundai has identified the cause as a porous casting on the rear cover, leading to the Hyundai Tucson ATF leak and similar issues in other models.
This issue is detailed in Technical Service Bulletin (TSB) 22-AT-002H, which supersedes TSB 21-AT-017H. The updated bulletin specifically requires a photo of the ATF leak to be submitted for proper diagnosis and warranty consideration.
Symptoms
The primary symptom of this issue is the presence of an automatic transmission fluid (ATF) leak. Owners might notice red or brown fluid spots under their vehicle, particularly near the rear of the transmission. This indicates a Hyundai Tucson ATF leak or a leak in the other affected models.
Important Warnings for Owners and Technicians
Hyundai TSB 22-AT-002H includes critical instructions regarding the repair process:
- Do NOT replace the rear cover of the automatic transaxle. The rear cover is integral to controlling the end-play on the disk set and clutch pack. Replacing only the cover without correctly adjusting selectable spacers for end-play can negatively affect the transmission's durability.
- A photo of the ATF leak is required for warranty claims. Technicians must document the leak near the black pressure port check plug and submit it to the Techline Repository using the GDS Mobile system.
- If other parts not covered by this TSB are found to need replacement during the repair, and they are still under warranty, a separate claim must be submitted. For out-of-warranty parts, prior approval for goodwill consideration is required.
Diagnosis and Repair Procedure
If a Hyundai Tucson ATF leak or similar leak is identified in an affected vehicle, the service procedure outlined in TSB 22-AT-002H involves several steps:
- Leak Confirmation and Documentation: The technician must first confirm the transmission is leaking from the rear cover, specifically near the black pressure port check plug. A photo of this leak must be taken.
- Photo Submission via GDS Mobile: The photo is then uploaded to the Techline Repository using the GDS Mobile system. This involves navigating through the GDS home page, selecting STUI, confirming the VIN, using the camera icon to
Add NewandTake a Photoof the leak, thenSaveandSubmitthe image. The technician must thenRetrievethe image to verify the upload for Prior Approval (PA). - Transaxle Replacement: Once Prior Approval is granted based on the submitted photo, the automatic transaxle assembly is replaced according to the applicable vehicle shop manual.
Parts Information
The following part numbers are associated with the automatic transaxle assemblies for the affected models:
| Model | Transmission | Drivetrain | ATM Type | Part Number |
|---|---|---|---|---|
| Sonata (DN8a) | 1.6T | 2WD | 8AT Smartstream | 45000-4G621 |
| Sonata (DN8a) | 2.5L | 2WD | 8AT Smartstream | 45000-4G610 |
| Sonata (DN8a) | 2.5L | 2WD | 8AT Smartstream | 45000-4G611 |
| Santa Fe (TMa) | 2.5L | 2WD | A8MF1 | 45000-4GDX0 |
| Santa Fe (TMa) | 2.5L | 4WD | A8MF1 | 45000-4GDX5 |
| Tucson (NX4a) | 2.5L | 2WD | A8MF1 | 45000-4GDM0 |
| Tucson (NX4a) | 2.5L | 2WD | A8MF1 | 45000-4GDN0 |
| Tucson (NX4a) | 2.5L | 4WD | A8MF1 | 45000-4GDM5 |
| Tucson (NX4a) | 2.5L | 4WD | A8MF1 | 45000-4GDN5 |
Warranty Information
Warranty claims for this repair should be submitted using the Campaign Claim Entry Screen. The following operation codes, causal parts, nature codes, and cause codes apply:
| Model | Op Code | Operation | Op Time | Causal Part | Nature Code | Cause Code |
|---|---|---|---|---|---|---|
| Sonata (DN8a) 1.6T | 10DA28R0 | Auto transmission assy. | 3.6 M/H | 45000-4G621 | T83 | ZZ3 |
| Sonata (DN8a) 2.5L | 10DA28R1 | Auto transmission assy. | 3.6 M/H | 45000-4G610, 45000-4G611 | T83 | ZZ3 |
| Santa Fe (TMa) 2WD | 10DA28R2 | Auto transmission assy. | 3.5 M/H | 45000-4GDX0 | T83 | ZZ3 |
| Santa Fe (TMa) 4WD | 10DA28R3 | Auto transmission assy. | 3.8 M/H | 45000-4GDX5 | T83 | ZZ3 |
| Tucson (NX4a) 2WD | 10DA28R4, 10DA28R6 | Auto transmission assy. | 3.3 M/H | 45000-4GDM0, 45000-4GDN0 | T83 | ZZ3 |
| Tucson (NX4a) 4WD | 10DA28R5 | Auto transmission assy. | 3.5 M/H | 45000-4GDM5, 45000-4GDN5 | T83 | ZZ3 |
Owner Action
If you notice signs of an ATF leak, particularly around the rear of your transmission, it is important to have your vehicle inspected by an authorized Hyundai service center. Inform them about the potential Hyundai Tucson ATF leak or similar issue and reference TSB 22-AT-002H. The repair, if applicable under warranty, should be performed free of charge.
Source: NHTSA ID: 10210200, TSB 22-AT-002H
Gallery
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Frequently Asked Questions
- What is TSB 22-AT-002H about?
- TSB 22-AT-002H addresses an automatic transmission fluid (ATF) leak at the rear cover of the 8-speed automatic transaxle in certain 2021-2022 Hyundai Sonata, Santa Fe, and Tucson models. The leak is caused by a porous casting on the rear cover.
- Which Hyundai models are affected by the ATF leak?
- The TSB applies to certain 2021 Hyundai Sonata (DN8a) 1.6T/2.5L, 2021 Hyundai Santa Fe (TMa) 2.5L, and 2022 Hyundai Tucson (NX4a) 2.5L vehicles. These vehicles were manufactured within specific date ranges in 2020 and 2021.
- Can the rear cover of the transmission be replaced to fix the leak?
- No, the TSB explicitly states, 'DO NOT replace the rear cover of the automatic transaxle.' The rear cover is critical for controlling clutch pack end-play, and incorrect replacement can affect transmission durability. The repair involves replacing the entire automatic transaxle assembly.
- What should I do if I suspect my Hyundai has an ATF leak?
- If you notice signs of an ATF leak, such as fluid spots under your vehicle, you should contact an authorized Hyundai dealership. They will diagnose the issue, take required photos of the leak for warranty purposes, and perform the necessary transaxle replacement if your vehicle is covered by TSB 22-AT-002H.
What Hyundai Tucson owners report
Counted from the records in our database across 22 model years.
- 6,738
- Owner complaints
- 37
- Recalls
- 564
- Service bulletins
- 276
- Crashes reported
- 145
- Fires reported
- 256
- Injuries reported
The 2022 model year
509 complaints, the 3rd most of 22 model years on file. Owners reported 31 crashes, 5 fires and 56 injuries for this year, which also has 3 recalls on file.
Power Train, the system this article covers, accounts for 1,273 of 6,738 complaints (19%), including 94 for 2022.
Complaints by model year
| 2012 | 255 | |
|---|---|---|
| 2013 | 266 | |
| 2014 | 202 | |
| 2015 | 229 | |
| 2016 | 1,626 | |
| 2017 | 1,095 | |
| 2018 | 399 | |
| 2019 | 385 | |
| 2022 | 509 | |
| 2025 | 451 |
Most-reported systems
- Engine — 2,451
- Power Train — 1,273
- Electrical System — 849
- Service Brakes — 761
- Forward Collision Avoidance — 432
Latest recalls for the 2022 model year
- 25V893000 — Trailer Hitches (Dec 2025) — Park outside
- 23V038000 — Structure (Jan 2023)
- 21V938000 — Electrical System (Dec 2021)
Recent owner reports about power train
On three occasions my car suddenly stopped transferring power by not accelerating when the gas pedal was pressed. The first time the engine light came on and when I brought it for service they said it was a sensor covered by warranty and repaired it.
Read owner complaints →System/Component Failed & Inspection: The vehicle suffers from recurring failures across the engine, powertrain, electronic throttle control, and exhaust gas recirculation (EGR) control systems (DTCs P0524, P0642, P2118, P022100).
Complaints are owner reports filed with NHTSA. They are unverified, and counts depend on how many vehicles were sold, so they are not a failure rate.
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