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2022-2024 Hyundai Tucson ISG System Not Restarting TSB

Hyundai has released TSB 23-FL-007H to improve the Idle Stop and Go (ISG) system in 2022-2024 Tucson vehicles. This update prevents non-restart issues after ISG engagement due to insufficient intake manifold pressure recovery.

Byeditor david chen2022 Hyundai Tucson
2022 Hyundai Tucson — manufacturer_communication document image 1
Source: NHTSA manufacturer_communication 10247606
23-FL-007HHyundai Tucson ISG not restartingIdle Stop and Go systemISG logic improvementECU updateTCU updateEngine Control ModuleTransmission Control ModuleNX4NX4a

Também se aplica a

Hyundai Tucson
2023–2024

Hyundai has issued Technical Service Bulletin (TSB) 23-FL-007H to address potential issues with the Idle Stop and Go (ISG) system in 2022-2024 Hyundai Tucson (NX4/NX4a) vehicles. This bulletin outlines a procedure to update the software for both the Transmission Control Module (TCM) and the Engine Control Module (ECM).

The primary goal of this update is to enhance the operation of the ISG system. Owners might experience a situation where their Hyundai Tucson ISG not restarting after the system has engaged, necessitating a manual restart. This condition is attributed to a temporary lack of intake manifold pressure recovery.

Symptoms

Owners may observe that their vehicle does not restart automatically after the Idle Stop and Go (ISG) system has activated. This requires the driver to manually restart the engine. This symptom indicates a potential problem with the ISG system's logic and its ability to recover intake manifold pressure efficiently, leading to the Hyundai Tucson ISG not restarting.

Important Warnings for Owners

  • Battery Voltage: If your vehicle's battery voltage is below 12 volts, a warning message such as "Warning! lower Battery Voltage. BATTERY VOLTAGE: 11.7" may appear on the GDS (Global Diagnostic System) screen during the update process. If this occurs, you must run the vehicle for at least 20 minutes to ensure adequate battery charge before reattempting the update.
  • TCU Update Applicability: The Transmission Control Unit (TCU) software updates (Event 1032 and Event 1034) are specifically for certain 2022MY vehicles only.

Software Updates for ISG Logic Improvement

The TSB details four specific software update events for improving the ISG logic, addressing the Hyundai Tucson ISG not restarting issue:

  • Event 1031 (Engine): ECU software improvement for NX4 Theta III 2.5GDI engines in VINs starting with “KMH”. This update applies to 2022-2024 model year vehicles.
  • Event 1032 (TCU): TCU software improvement for NX4 Theta III 2.5GDI engines in 2022MY vehicles with VINs starting with “KMH”.
  • Event 1033 (Engine): ECU software improvement for NX4a Theta III 2.5GDI engines in VINs starting with “5NM”. This update applies to 2022-2024 model year vehicles.
  • Event 1034 (TCU): TCU software improvement for NX4a Theta III 2.5GDI engines in 2022MY vehicles with VINs starting with “5NM”.

Repair Procedure Summary

The repair for the Hyundai Tucson ISG not restarting issue involves a software update performed by a Hyundai technician using the Global Diagnostic System (GDS). The general steps are as follows:

  1. Perform ECU Update in Auto Mode: The technician must first perform the ECU update using the GDS in Auto Mode. Before proceeding, they will verify the ECU ROM ID to ensure the correct software is applied. For additional tablet-based Mobile GDS ECU update information, technicians are advised to refer to TSB 15-GI-001. Note that TCU updates (Event 1032 and 1034) are applicable only to certain 2022MY vehicles.
  2. Document Completion: After the update, a screenshot of the

Galeria

2 imagens

Frequently Asked Questions

What is Hyundai TSB 23-FL-007H about?
Hyundai TSB 23-FL-007H addresses an issue with the Idle Stop and Go (ISG) system in 2022-2024 Hyundai Tucson vehicles, where the engine may not restart automatically after ISG engagement. It provides a software update for the Engine Control Module (ECM) and Transmission Control Module (TCM) to improve ISG logic.
Which Hyundai Tucson models are affected by the ISG non-restart issue?
This issue affects 2022, 2023, and 2024 model year Hyundai Tucson (NX4/NX4a) vehicles equipped with the Idle Stop and Go (ISG) system, specifically those produced between January 20, 2021, and October 4, 2023.
What causes the Hyundai Tucson ISG not restarting problem?
The problem stems from the ISG system's logic, which under certain circumstances, leads to a lack of intake manifold pressure recovery. This prevents the engine from restarting automatically after the ISG system has engaged.
How is the ISG system non-restart issue fixed?
The fix involves a software update to the Engine Control Module (ECM) and Transmission Control Module (TCM). This update, detailed in TSB 23-FL-007H, improves the ISG system's logic to ensure proper engine restart functionality.
Are there any specific warnings for owners during the update process?
Yes, technicians are advised that if the battery voltage drops below 12 volts, as indicated by a "Warning! lower Battery Voltage. BATTERY VOLTAGE: 11.7" message, the vehicle must be run for at least 20 minutes to ensure sufficient charge before proceeding with the software update.

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