# Warranty extension 26\-01\-028H

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: 11030324
- Published by NHTSA: 2026\-03\-30
- Manufacturer's number: 26\-01\-028H
- Manufacturer's date: 2026\-03\-16
- Campaign id or software version: LA12
- NHTSA component: POWER TRAIN

## NHTSA's summary

Certain Santa Cruz \(NXT\) vehicles equipped with 8\-speed dual clutch transmissions \(8DCT\) may set one of the high pressure electric oil pump \(HP EOP\) DTCs listed below. This bulletin provides the service procedure to update the Transmission Control Unit \(TCU\) with improved logic to address these DTCs and enhance operation of the 8DCT.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030324-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11030324-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2022 to 2024 HYUNDAI SANTA CRUZ

## Recalls for the same vehicles and component

- [2022568](/recalls/tc/2022568.md), 2022-10-06: Powertrain
- [22V746000](/recalls/nhtsa/22V746000.md), 2022-10-06: POWER TRAIN:AUTOMATIC TRANSMISSION

## Other bulletins for the same vehicles and component

- [26\-AT\-005H TSB](/bulletins/11033840.md), 2026-06-16, Service bulletin: POWER TRAIN. 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.
- [26\-AT\-001H TSB](/bulletins/11029937.md), 2026-03-11, Service bulletin: POWER TRAIN. Some Santa Cruz \(NXT\), Santa Fe \(TMA, MX5A\), and Sonata \(DN8A\) models may require replacement of the 8\-speed wet dual clutch transmission \(8WDCT\) when the vehicle sets one of the high pressure electric oil pump \(HP EOP\) DTCs listed below. This bulletin provides instructions to replace the 8WDCT.
- [24\-AT\-001H\-1](/bulletins/11012043.md), 2024-12-21, Service bulletin: POWER TRAIN. This bulletin provides the procedure for updating the automatic transmission TCU \(Transmission Control Unit\) software to improve shift quality, judder and hesitation when accelerating.
- [24\-AT\-002H](/bulletins/10253275.md), 2024-04-16, Service bulletin: POWER TRAIN. This TSB provides a procedure to diagnose and replace, if necessary, an automatic transmission with Incorrect Ratio DTC \(transmission clutch slip in gear above limit\) listed on Page 2.
- [24\-AT\-001H](/bulletins/10251293.md), 2024-03-05, Service bulletin: POWER TRAIN. This bulletin provides the procedure for updating the automatic transmission TCU and ECU software \(Santa Fe ONLY\) to improve shift quality, judder with ISG enabled and hesitation when accelerating.
- [23\-AT\-011H](/bulletins/10241891.md), 2023-09-06, Service bulletin: POWER TRAIN. This bulletin outlines changes to the service procedure regarding the replacement of 8\-speed wet dual clutch transmissions \(8WDCT\) and associated transmission control unit \(TCU\). These changes only apply to vehicles equipped with Theta 2.5T engines. Certain transmissions \(indicated by a new part number\) have received an improved clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT hardware, otherwise drivability concerns may occur.
- [23\-AT\-012H](/bulletins/10241890.md), 2023-09-06, Service bulletin: POWER TRAIN. This bulletin provides information related to a Transmission Control Unit \(TCU\) software update for certain vehicles equipped with an 8\-speed wet dual clutch transmissions \(8WDCT\) that improves the touch point learning variation. Certain 8WDCTs \(indicated by a new part number\) received an improved clutch spring. The correct TCU software update must be matched with the correct corresponding 8WDCT hardware, otherwise drivability concerns may occur.
- [23\-AT\-003H\-1](/bulletins/10241885.md), 2023-09-06, Service bulletin: POWER TRAIN. If you are servicing an 8\-speed vehicle with a “Check Engine” light on and one or more of the DTC listed, follow the service procedure and replace the related solenoid and harness.
- [23\-AT\-002H](/bulletins/10237183.md), 2023-06-02, Service bulletin: POWER TRAIN. This bulletin provides service procedures to prevent possible moisture intrusion of the HP EOP \(High Flow Electric Oil Pump\) connector when servicing the 8\-speed wet dual clutch transmission \(8WDCT\). If moisture enters the HF EOP connector, this can result in corrosion and insufficient connection of the terminals.
- [23\-AT\-004H](/bulletins/10237182.md), 2023-06-02, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN. This TSB applies only if Recall 236 or Service Campaign T8N has been performed and the 8 speed wet dual clutch transmission \(8WDCT\) replacement is necessary related due to high pressure electric oil pump \(HP EOP\) DTC’s P1C2D03 \(HP EOP Motor Position Sensor\), P193B79 \- HP EOP Performance, P0868 \- Transmission Fluid Pressure \(TFP\) Sensor – Low. Replace the 8WDCT under this bulletin.

JSON: [/v1/bulletins/11030324](/v1/bulletins/11030324)

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