2022 Hyundai Santa Fe, Sonata, Tucson ECU/TCU Drivability Update

Hyundai has issued Technical Service Bulletin (TSB) 22-01-006H-3, identified as Service Campaign T7R, to improve the drivability and shift quality of certain 2022 Santa Fe, Sonata, and Tucson vehicles. This update specifically targets models equipped with an 8-speed transmission. The TSB supersedes a previous bulletin, 22-01-006H-2, by expanding its coverage to include the Sonata (DN8a) model.

This software update aims to resolve issues such as rough shifting and hesitation during acceleration. Owners searching for a solution to their Hyundai Tucson drivability update concerns should be aware of this important service action.

Important Warnings for Owners

Hyundai has specific instructions regarding this service campaign:

• Dealer Stock Vehicles Only: Dealers are required to perform this Service Campaign prior to customer retail delivery.
• Campaign Identification: When a vehicle arrives at the Service Department, technicians will access the “Vehicle Information” screen via WEBDCS to identify any open campaigns, including TSB 22-01-006H-3.
• Failed Update Recovery: If the ECU or TCU Update starts but then fails in Auto Mode, technicians must disconnect the battery cables and touch the cables together for one minute. Reconnect the battery cables, attach a battery charger, and perform the update in Manual Mode to recover.
• DTC Check: After the TCU Update is completed, technicians must check for Diagnostic Trouble Codes and erase any DTC.

Symptoms and Drivability Concerns

This TSB addresses general drivability and shift quality issues that owners might experience, particularly during acceleration. While no specific dashboard warning lights or error messages are detailed, the update targets performance characteristics that could lead to a less smooth driving experience. These issues are categorized by Hyundai under specific event labels:

• Acceleration Logic Improvement (ECU):
  • "TMa THETA 2.5GDI 8AT ACCELERATION LOGIC IMPROVEMENT (ECU)" (Event #771)
  • "DN8a THETA 2.5GDI 8AT ACCELERATION LOGIC IMPROVEMENT (ECU)" (Event #773)
  • "NX4a THETA 2.5GDI 8AT ACCELERATION LOGIC IMPROVEMENT (ECU)" (Event #775)
  • "NX4 2.5GDI 8AT ACCELERATION DRIVABILITY ENHANCED LOGIC (ECU)" (Event #791)
  • "DN8 2.5GDI ISG AND ACCELERATION DRIVABILITY ENHANCED LOGIC (ECU)" (Event #781)
• Rough Shift and Hesitation Improved Logic (TCU):
  • "TMa THETA 2.5GDI 8AT ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)" (Event #772)
  • "DN8a THETA 2.5GDI 8AT ACCELERATION LOGIC IMPROVEMENT (TCU)" (Event #774)
  • "NX4a THETA 2.5GDI 8AT ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)" (Event #776)
  • "NX4 THETA 2.5GDI 8AT ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)" (Event #776)
  • "DN8 2.5GDI ROUGH SHIFT AND HESITATION IMPROVED LOGIC (TCU)" (Event #782)

These labels indicate the specific software improvements being applied to the Engine Control Unit (ECU) and Transmission Control Unit (TCU) for various engine and transmission combinations.

Repair Procedure Summary

The core of Service Campaign T7R is a software update for both the Engine Control Unit (ECU) and the Transmission Control Unit (TCU). This procedure is performed using the Hyundai Global Diagnostic System (GDS).

1. Initial Update in Auto Mode: The technician must first attempt the ECU and TCU software update in GDS Auto Mode.
2. Manual Mode Recovery (if needed): If the update process fails in Auto Mode, a specific recovery procedure is required. This involves disconnecting the vehicle's battery cables, touching them together for one minute, and then reconnecting them. A battery charger must be attached before attempting the update again in GDS Manual Mode. Technicians are advised to refer to TSB 15-GI-001 for general GDS Mobile instructions.
3. DTC Check and Erase: After successfully completing the TCU update, the technician must check for any Diagnostic Trouble Codes (DTCs) and clear them from the system.

The update involves flashing new software (ROM ID) onto the control units. The TSB provides extensive tables detailing the old and new part numbers and ROM IDs for the ECU and TCU across all affected models and VIN ranges. For example, a Santa Fe (TMa) with VIN starting with 5NM might have an old ECU Part Number 39110-2S092 updated to 39110-2S274, changing the ROM ID from TADVN5GMH3XXXL5A to TADVN5GMH3XXXL5B.

Required Tools or Parts

Technicians will require the following to perform the update:

• Hyundai Global Diagnostic System (GDS)
• Battery charger (for manual mode recovery, if necessary)

No physical parts are replaced as part of this service campaign; it is a software-only update. This ensures that the Hyundai Tucson drivability update is efficient and resolves the underlying software logic.

Owner Action

If you own a 2022 Hyundai Santa Fe, Sonata, or Tucson and are experiencing issues with drivability, rough shifting, or hesitation, you should contact your authorized Hyundai dealer. This software update is performed under Service Campaign T7R and should be completed free of charge. The dealer will check your vehicle's eligibility and perform the necessary ECU and TCU software reprogramming to improve your vehicle's performance.

NHTSA ID: 10210208