2021-2022 Hyundai Transaxle ATF Leak TSB 22-AT-002H

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:

1. 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.
2. 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 New and Take a Photo of the leak, then Save and Submit the image. The technician must then Retrieve the image to verify the upload for Prior Approval (PA).
3. 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