2021-2022 Hyundai TCU Update for Rough Shifting Issues
Hyundai has released Technical Service Bulletin (TSB) 24-AT-001H-1 to address concerns regarding rough shifting, judder, and hesitation during acceleration in certain 2021-2022 Hyundai Sonata, 2022 Tucson, and Santa Cruz vehicles. This TSB provides a software update for the Transmission Control…
Sarah Mitchell2022 Hyundai Tucson
Also applies to
- Hyundai Santa Cruz
- 2022
Hyundai has released Technical Service Bulletin (TSB) 24-AT-001H-1, dated December 2024, to improve the automatic transmission's shift quality, judder, and hesitation during acceleration in certain models. This bulletin outlines the procedure for updating the Transmission Control Unit (TCU) software.
This TSB specifically updates a previous bulletin, TSB 24-AT-001H, by removing the 2023 Santa Fe (TMA) from the applicable vehicle list. For information regarding a separate software update for TMa ISG Logic improvement, owners should refer to TSB 24-FL-004H.
Symptoms
Owners of affected vehicles may notice issues with the automatic transmission, including:
- Rough shifting: The transmission may not shift smoothly between gears, leading to an uncomfortable driving experience.
- Judder: A vibration or shuddering sensation may be felt during gear changes or acceleration.
- Hesitation when accelerating: A delay or lack of immediate response may occur when pressing the accelerator pedal, impacting vehicle performance.
These symptoms indicate that the Transmission Control Unit (TCU) software may require an update to optimize its performance and resolve the Hyundai Tucson rough shift issue.
Diagnosis / Trigger Conditions
The primary trigger for this service action is the presence of the described transmission symptoms. Hyundai's diagnostic system (GDS) identifies specific events related to these symptoms, guiding technicians to the appropriate software update:
- Event 1060: DN8A 2.5GDI ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)
- Event 1061: NX4A 2.5GDI ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)
- Event 1062: NX4A OB 2.5GDI ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)
These events correspond to specific vehicle models and engine configurations, ensuring the correct software is applied to address the Hyundai Tucson rough shift problem.
Important Warnings
Owners should be aware of specific conditions that technicians must follow during the update process:
- The GDS TCU Update must initially be performed in Auto Mode. If the ECU Update begins but then fails in Auto Mode, the technician must switch to Manual Mode to recover and complete the update.
- If the GDS system displays a
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Frequently Asked Questions
- What is Hyundai TSB 24-AT-001H-1 about?
- TSB 24-AT-001H-1 addresses concerns about rough shifting, judder, and hesitation during acceleration in certain 2021-2022 Hyundai Sonata, 2022 Hyundai Tucson, and 2022 Hyundai Santa Cruz vehicles by providing a software update for the Transmission Control Unit (TCU).
- What symptoms indicate my Hyundai might need this TCU update?
- You might experience symptoms such as rough gear changes, a juddering sensation, or hesitation when accelerating. These are signs that your vehicle could benefit from the software update described in TSB 24-AT-001H-1 to resolve the Hyundai Tucson rough shift problem.
- How will the dealer fix the rough shifting and hesitation?
- Your Hyundai dealer will perform a software update on your vehicle's Transmission Control Unit (TCU) using the GDS-Smart system. This procedure is designed to improve shift quality and eliminate judder and hesitation. The process also includes checking for and clearing any incidental fault codes.
- Is there a cost for this TCU software update?
- According to the TSB, normal warranty applies to this procedure. If your vehicle is still under warranty, the software update should be performed free of charge. It is always best to confirm warranty coverage with your Hyundai dealer.
- What if my vehicle's battery voltage is low during the update?
- The TSB specifies that if the battery voltage is below 12 volts, a 12V battery charger must be attached to ensure a stable power supply during the update. This prevents potential issues during the software installation.
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