Warranty extension 26-01-060H TSB
A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.
| Type | Warranty extension |
|---|---|
| NHTSA id | 11036095 |
| Published by NHTSA | 2026-08-11 |
| Manufacturer's number | 26-01-060H TSB |
| Manufacturer's date | 2026-07-27 |
| Campaign id or software version | LA15 |
| NHTSA component | POWER TRAIN |
NHTSA's summary
Certain Sonata (DN8) vehicles may exhibit a transmission oil leak at the bottom of the valve body cover due to a loose oil level plug that could potentially lead to a total failure of the automatic transmission. This bulletin provides instructions to inspect the oil level plug and transmission oil level and, if necessary, replace the automatic transmission.
The document
The document is the manufacturer's. This site does not hold it. NHTSA files a document at one of these two addresses; we have not asked NHTSA which.
Components
Transmission and driveline
| HYUNDAI SONATA | 2025, 2026 |
|---|
Listing a model year does not mean every vehicle of it is concerned: the document says which.
| 26-01-060H WebDCS | 2026-08-11. Warranty extension. Certain Sonata (DN8) vehicles may exhibit a transmission oil leak at the bottom of the valve body cover due to a loose oil level plug that could potentially lead to a total failure of the automatic transmission. Technical Service Bulletin (TSB) 26-01-060H instructions to inspect the oil level plug and transmission oil level and, if necessary, replace the automatic transmission. |
|---|---|
| 26-AT-005H TSB | 2026-06-16. Service bulletin. This bulletin provides information related to a Transmission Control Unit (TCU) software update for some vehicles equipped with an 8-speed wet dual clutch transmission (8WDCT). The software update revises the touch point learning variation, improving drivability and judder symptoms. Some 8WDCTs (indicated by a new part number) received an updated clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT hardware, otherwise, drivability concerns may occur. This service procedure should be performed prior to any 8WDCT replacements done for drivability/judder concerns. |