2025 Hyundai Ioniq 5 N EBD System Software Update

Symptoms of the Hyundai Ioniq 5 EBD Fault

Owners of certain 2025 Hyundai Ioniq 5 N vehicles may notice an illuminated ESC warning lamp in the instrument cluster. This occurs when there is a malfunction detected with the steering angle, yaw sensor, or lateral acceleration sensor.

Crucially, the ABS and BRAKE warning lamps, which should typically illuminate in such scenarios, do not activate. This behavior indicates a potential disablement of the Electronic Brake Force Distribution (EBD) system due to an Integrated Electronic Booster (IEB) software logic issue.

Diagnosis and Trigger Conditions

This issue, identified by Hyundai as Service Campaign 9B7, is triggered by specific sensor malfunctions. When the steering angle, yaw, or lateral acceleration sensors report an error, the IEB software may incorrectly disable the EBD system.

Technicians will use the Global Diagnostic System (GDS) to identify the condition, looking for Event #1114, described as "NE N IMPROVEMENT OF EBD NON-OPERATION ISSUES DUE TO NE N IEB S/W ERRORS." The diagnostic process involves checking the current ROM ID of the IEB system to determine if an update to version 1.04 is required.

Important Warnings for Owners and Technicians

Hyundai has issued several critical advisories regarding this service campaign:

• Dealer-Specific Repair: "To avoid any potential damage to IONIQ vehicles, this service campaign can only be performed at IONIQ certified dealers." Owners should ensure they visit an authorized IONIQ service center.
• Pre-Delivery and Maintenance Requirement: Dealers are mandated to perform this service campaign on all affected 2025 Hyundai Ioniq 5 N vehicles prior to customer retail delivery. The update must also be performed whenever an affected vehicle is brought in for any maintenance or repair.
• Battery Voltage During Update: During the ECU update process, if the GDS displays a "Warning! lower Battery Voltage. BATTERY VOLTAGE: 11.7" message or similar, technicians must attach a battery charger to ensure sufficient voltage for a reliable update.
• Update Mode: The GDS ECU update should initially be performed in Auto Mode. If the update fails in Auto Mode, it must be performed in Manual Mode to recover.

Repair Procedure Summary

Hyundai Service Campaign 9B7, detailed in TSB 24-01-064H-1 (which supersedes TSB 24-01-064H), focuses on updating the Integrated Electronic Booster (IEB) software. This update ensures the Electronic Brake Force Distribution (EBD) system operates correctly and displays the appropriate warning lamps in the event of sensor malfunctions.

1. Initial Preparation: Technicians first confirm adequate battery voltage. If a low voltage warning appears, a battery charger is connected.
2. ECU Software Update: The update is performed using the GDS, initially in Auto Mode. The technician verifies the current IEB ROM ID against the required new version (1.04). If the Auto Mode update fails, it is retried in Manual Mode using the password '2558' for the ECM Menu NE N IEB 58520-NI000.
3. System Reset: After the update reaches 100% completion, the vehicle's ignition is cycled OFF for at least 10 seconds to reset the control unit.
4. OTA Initialization: The Over-the-Air (OTA) initialization process begins. If this process does not complete automatically, technicians manually initiate it via GDS-Smart through the Central Communication Unit (CCNF).
5. Documentation and DTC Clearing: A screenshot of the "ECU Update Complete" screen is taken for warranty documentation. Any diagnostic trouble code (DTC) history that may have been incidentally generated during the update is then cleared.
6. Power Cycle: The power connector to the indoor fuse box (or the negative 12V battery terminal) is disconnected for at least 5 seconds and then reconnected.
7. Final Verification: The vehicle is placed in "Ready" mode to confirm the proper operation of the newly updated system.

Required Parts and Software

To address the Hyundai Ioniq 5 EBD fault, the following are necessary:

• Software Update: Integrated Electronic Booster (IEB) software, with the target version being ROM ID 1.04. This update replaces previous versions including 1.00, 1.01, 1.02, and 1.03.
• ECU Part Number: The affected Integrated Electronic Booster (IEB) has an ECU Part Number of 58520-N1000.
• Special Tools: The Global Diagnostic System (GDS) or Tablet-Based GDS-Smart is required for performing the software update. Technicians may refer to TSB 24-GI-012H for specific procedures related to the Tablet-Based GDS-Smart.
• Warranty Information: The operation code for this service is 40D099R0, with a casual part number of 58520-N1000, Nature Code I14, and Cause Code ZZ3.

Owner Action

If you own a 2025 Hyundai Ioniq 5 N (NE N EV) manufactured between December 18, 2023, and April 18, 2024, and you observe the ESC warning lamp illuminating under conditions that might suggest a brake system issue, particularly if related to steering or acceleration sensors, your vehicle may be affected by the Hyundai Ioniq 5 EBD fault. Hyundai is performing this software update under Service Campaign 9B7 (TSB 24-01-064H-1) free of charge.

You should contact an IONIQ certified Hyundai dealer to schedule the Integrated Electronic Booster (IEB) software update. This update may also be completed by customers with active Blue Link subscriptions via an Over-the-Air (OTA) update.

NHTSA ID: 11008138