10/21/2025
Hyundai DCT 8 SPEED
Hyundai Technical Service Bulletin Summary
This document provides a summarized overview of Hyundai’s Technical Service Bulletin (TSB 23-AT-013H), originally published as
NHTSA reference MC-10241889-0001. The bulletin addresses software updates and service procedures for Hyundai N-model vehicles equipped with the 8-speed wet dual-clutch transmission (8DCT).
Key Details
• • Affected Models: 2021–2023 Hyundai Veloster N, Elantra N, and Kona N equipped with 2.0L Turbo engines.
• • Transmission Type: Applies to vehicles equipped with the 8-speed Wet Dual-Clutch Transmission (8DCT).
• • Reported Issues: Customers may experience harsh shifting, delayed engagement, or clutch-related irregularities.
• • Root Cause: Outdated Transmission Control Unit (TCU) software affecting clutch touch-point learning and shift behavior.
• • Solution: Update the TCU software using Hyundai’s Global Diagnostic System (GDS) tool — no physical part replacements required.
• • Procedure: Follow GDS reprogramming steps including vehicle battery support, proper connection, and line pressure release during update.
• • Warranty Coverage: Service performed under standard Hyundai Powertrain Warranty terms.
• • Objective: Improve overall drivability, clutch engagement smoothness, and shift quality after the TCU reflash.
Technicians should ensure that all updates are completed according to Hyundai’s service guidelines and verify smooth operation after reprogramming.
https://static.nhtsa.gov/odi/tsbs/2023/MC-10241889-0001.pdf