# Service bulletin 24\-AT\-002H

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: Service bulletin
- NHTSA id: 10253275
- Published by NHTSA: 2024\-04\-16
- Manufacturer's number: 24\-AT\-002H
- Manufacturer's date: 2024\-04\-09
- NHTSA component: POWER TRAIN

## NHTSA's summary

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.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2024/MC-10253275-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2024/MC-10253275-9999.pdf)

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

## Components

Transmission and driveline

## Vehicles listed

- 2017 to 2018 GENESIS G80
- 2017 to 2018 GENESIS G90
- 2012 to 2017 HYUNDAI ACCENT
- 2006 to 2017 HYUNDAI AZERA
- 2011 to 2019 HYUNDAI ELANTRA
- 2013 to 2014 HYUNDAI ELANTRA COUPE
- 2018 to 2020 HYUNDAI ELANTRA GT
- 2011 to 2016 HYUNDAI EQUUS
- 2009 to 2016 HYUNDAI GENESIS
- 2010 to 2016 HYUNDAI GENESIS COUPE
- 2024 HYUNDAI KONA
- 2020 to 2024 HYUNDAI PALISADE
- 2022 to 2024 HYUNDAI SANTA CRUZ
- 2021 to 2023 HYUNDAI SANTA FE HYBRID
- 2013 to 2018 HYUNDAI SANTA FE SPORT
- 2011 to 2024 HYUNDAI SONATA
- 2016 to 2020 HYUNDAI SONATA HYBRID
- 2010 to 2024 HYUNDAI TUCSON
- 2022 HYUNDAI TUCSON HYBRID
- 2013 to 2015 HYUNDAI VELOSTER
- 2019 to 2021 HYUNDAI VELOSTER

## Recalls for the same vehicles and component

- [2024431](/recalls/tc/2024431.md), 2024-07-25: Powertrain
- [2023414](/recalls/tc/2023414.md), 2023-07-27: Powertrain
- [23V526000](/recalls/nhtsa/23V526000.md), 2023-07-27: POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT:PUMP
- [2022568](/recalls/tc/2022568.md), 2022-10-06: Powertrain
- [22V746000](/recalls/nhtsa/22V746000.md), 2022-10-06: POWER TRAIN:AUTOMATIC TRANSMISSION
- [2018135](/recalls/tc/2018135.md), 2018-03-16: Powertrain
- [2016436](/recalls/tc/2016436.md), 2016-09-08: Powertrain
- [16V628000](/recalls/nhtsa/16V628000.md), 2016-08-30: ELECTRICAL SYSTEM:SOFTWARE; POWER TRAIN:AUTOMATIC TRANSMISSION:CONTROL MODULE \(TCM/PCM/TECM\)
- [2016060](/recalls/tc/2016060.md), 2016-02-08: Powertrain
- [16V057000](/recalls/nhtsa/16V057000.md), 2016-01-28: POWER TRAIN:AUTOMATIC TRANSMISSION:COOLING UNIT AND LINES

## 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\-01\-028H](/bulletins/11030324.md), 2026-03-30, Warranty extension: POWER TRAIN. 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.
- [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.
- [26\-AT\-002H](/bulletins/11028968.md), 2026-02-24, Service bulletin: POWER TRAIN. Some Santa Fe \(TMA\) and Tucson \(NX4A\) vehicles equipped with a 2.5L GDI engine and 8 speed automatic transmission may have DTC U028700 \(Lost Communication With Trans Fluid Pump Module\) set by the transmission Electric Oil Pump \(EOP\). This DTC can cause the Idle Stop \& Go \(ISG\) system to become inoperative. Follow the procedure in this bulletin to replace the Electric Oil Pump on affected vehicles.
- [25\-01\-042H TSB](/bulletins/11020692.md), 2025-07-15, Service campaign: POWER TRAIN. 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.
- [25\-AT\-001H TSB](/bulletins/11018891.md), 2025-06-03, Service bulletin: POWER TRAIN. Certain Santa Fe \(TMA\) and Sonata \(DN8/DN8A\) vehicles equipped with 8\-speed dual clutch transmissions \(8DCT\) may exhibit one of the DTCs listed below, related to the high pressure electric oil pump \(HP EOP\). Follow the procedures in this TSB to update the Transmission Control Unit \(TCU\) to the latest sensorless logic on affected vehicles, and then perform air bleeding and transmission learning.
- [TXXZ OL](/bulletins/11014615.md), 2025-03-01, Warranty extension: POWER TRAIN. Certain 2014 – 2015 model year Tucson vehicles may have a weakened weld at the zone where the center muffler is attached to the exhaust pipe. This condition may cause the center muffler to detach from the exhaust pipe. At Hyundai, we are committed to providing vehicles of outstanding quality and value. In an effort to meet this commitment, Hyundai is extending the warranty coverage for the center muffler assembly under this condition to 15 years / 150,000 miles from the date of original retail delivery or date of first use and is valid for original and subsequent owners.
- [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\-DS\-001G\-1 TSB](/bulletins/11009768.md), 2024-11-05, Service bulletin: POWER TRAIN. Certain GV70 \(JK1, JK1A\), GV80 \(JX1\) and G80 \(RG3\) vehicles may have a hum or whine noise condition from the rear differential at certain speeds. This bulletin describes the procedure to inspect the vehicle for the hum or whine noise and if necessary to tighten the rear differential lock nut first. If the hum or whine noise remains, then replace the rear differential or other driveline components as necessary.
- [21\-AT\-010HG](/bulletins/10253037.md), 2024-04-11, Service bulletin: POWER TRAIN:AUTOMATIC TRANSMISSION; POWER TRAIN. This TSB provides a procedure to replace the solenoids listed below for slipping, shift flare and/or harsh shift during the 2\~3, 3\~4 or 4\~5 upshift.

JSON: [/v1/bulletins/10253275](/v1/bulletins/10253275)

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