2025 Hyundai Ioniq 5 N EBD Operation Software Update

Hyundai has released Service Campaign 24-01-064H (internal campaign code 9B7) to address a software issue affecting the Electronic Brake Force Distribution (EBD) system in certain 2025 Hyundai Ioniq 5 N (NE N) vehicles. This update ensures proper EBD functionality and correct warning lamp illumination.

Important Warnings for Owners

Hyundai emphasizes several critical points regarding this service campaign:

• Dealer Action Required: Dealers are mandated to perform this service campaign on all affected vehicles before customer retail delivery and whenever an affected vehicle is brought in for any maintenance or repair.
• Specialized Service: To prevent potential damage, this service campaign can only be performed by Hyundai IONIQ certified dealers.
• Battery Voltage: During the software update, if the GDS system displays a "Warning! lower Battery Voltage. BATTERY VOLTAGE: 11.7" message or similar, a battery charger must be connected to ensure adequate voltage for a successful update.

What's Being Addressed

Certain 2025 Hyundai Ioniq 5 N (NE N) vehicles, specifically those produced between December 18, 2023, and April 18, 2024, may experience a specific software logic issue within the Integrated Electronic Booster (IEB) system. This issue can disable the Electronic Brake Force Distribution (EBD) system if there's a malfunction with the steering angle, yaw, or lateral acceleration sensors.

When this occurs, the Electronic Stability Control (ESC) warning lamp illuminates in the instrument cluster. The intended behavior, which this update restores, is for the ABS and BRAKE warning lamps to illuminate instead, providing a more accurate indication of the fault.

Fault Codes and System Events

This issue is associated with:

• System Event: 1114
• Description: NE N IMPROVEMENT OF EBD NON-OPERATION ISSUES DUE TO NE N IEB S/W ERRORS

While not a traditional DTC (Diagnostic Trouble Code) in the Pxxxx format, Event #1114 is the identifier for this specific condition within the ABS/ESC system.

Diagnosis and Trigger Conditions

The Electronic Brake Force Distribution (EBD) system's non-operation is triggered by a malfunction in one or more of the following sensors:

• Steering angle sensor
• Yaw sensor
• Lateral acceleration sensor

When these sensors malfunction, the IEB software incorrectly disables EBD and illuminates the ESC warning lamp. The software update provided by Hyundai Service Campaign 24-01-064H corrects this logic.

Repair Procedure Summary

The repair for the Hyundai Ioniq 5 EBD operation issue involves updating the Integrated Electronic Booster (IEB) software. This procedure is performed using the GDS (Global Diagnostic System) and includes several key steps:

1. Initial Update in Auto Mode: The ECU update must first be attempted in Auto Mode via the GDS system. Technicians should refer to TSB 24-GI-012H for detailed instructions on the "ECU Update Procedure for Tablet-Based GDS-Smart."
2. ROM ID Verification: Before proceeding, the vehicle's current ROM ID version for the ABS/ECU system is checked against the latest available version (new ROM ID 1.04, superseding old versions 1.00, 1.01, 1.02) to confirm the update is necessary.
3. Manual Mode Fallback: If the ECU update fails in Auto Mode, it must be performed in Manual Mode. The manual mode password for Event #1114 is 2558, used with the ECM Menu: NE N IEB 58520-N1000.
4. Battery Management: If a low battery voltage warning appears, a battery charger must be connected to maintain adequate voltage during the update.
5. Ignition Cycle and OTA Initialization: After the update reaches 100% completion, the ignition must be cycled OFF for at least 10 seconds (up to 30 seconds for some models) to reset the control unit. An Over-the-Air (OTA) initialization process will then begin.
6. Troubleshooting Failed OTA: If OTA initialization fails, technicians must connect GDS-Smart to S/W Management, then Central Communication Unit (CCNF), and finally perform OTA Initialization.
7. Documentation: A screenshot of the "ECU Update Complete" screen is taken and uploaded to the STUI system for repair validation.
8. Fault Code Clearing: After the update, a fault code search is performed, and any incidentally generated DTC history is erased.
9. Power Reset: The power connector (A) of the indoor fuse box, or alternatively the negative 12V battery terminal, is disconnected for at least 5 seconds and then reconnected.
10. Final Check: The vehicle is placed in Ready mode to confirm proper operation.

Required Tools or Parts

• Diagnostic Tool: GDS (Global Diagnostic System) or GDS-Smart tablet.
• ECU Part Number: The Integrated Electronic Booster (IEB) ECU has part number 58520-N1000.
• Battery Charger: Required if the vehicle's battery voltage is below 12 Volts during the update process.

Software Versions

The software update changes the ROM ID for the Integrated Electronic Booster (IEB) system:

• Old ROM ID Versions: 1.00, 1.01, 1.02
• New ROM ID Version: 1.04

Owner Action

If you own a 2025 Hyundai Ioniq 5 N and experience the ESC warning lamp illuminating when you suspect a brake system issue, or if you are simply due for routine maintenance, contact your authorized Hyundai IONIQ certified dealer. Since this is a service campaign (24-01-064H), the software update will be performed free of charge. The update may also be completed via an Over-the-Air (OTA) update for vehicles with active Blue Link subscriptions.

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Source: NHTSA ID: 11006834