2022-2024 Hyundai Ioniq 5/6, Kona Electric Charging Logic Update

Hyundai has issued Service Campaign 9B5, documented in Technical Service Bulletin (TSB) 24-01-051H-1, to address charging issues in certain electric vehicles. This bulletin supersedes the previous TSB 24-01-051H and now includes the Kona Electric (SX2 EV) models.

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. The update must also be applied whenever an affected vehicle is in the shop for any maintenance or repair.
• IONIQ Certified Dealers Only: For IONIQ 5 and IONIQ 6 vehicles, this service campaign can only be performed at IONIQ certified dealers to prevent potential damage.
• Battery Voltage Check: If the GDS (Global Diagnostic System) warns of vehicle battery low voltage (below 12 Volts) during the ECU update, the technician must attach a battery charger. This ensures an adequate battery charge for reliable update results. The ignition must be turned back ON before retrying the ECU update.
• Failed Update Recovery: If the ECU update fails in Auto Mode, it should be reattempted in Manual Mode. If the upgrade still fails, the power connector or the battery (-) connector must be removed from the indoor fuse box for at least 5 seconds, then reassembled to retry the upgrade.

Symptoms

Owners of affected 2022-2024 Hyundai Ioniq 5, 2023-2024 Hyundai Ioniq 6, and 2024-2025 Hyundai Kona Electric vehicles may notice specific problems when charging with a 240V AC (Level 2) charger. These symptoms include an "interrupted charging session" or a "lower charging speed". This behavior is a protective measure initiated by the vehicle to prevent potential damage to the charging cable connection.

Diagnosis / Trigger Conditions

The condition is specifically observed when charging with a 240V AC (Level 2) charger. The Vehicle Charging Management System (VCMS) software logic is designed to initiate a self-restart to stabilize charging and return to full capacity after an interruption. The TSB outlines a software update to improve this logic.

Repair Procedure Summary

The repair involves updating the software logic for the Vehicle Charging Management System (VCMS) using the GDS system. The general steps are:

1. Initial ECU Update: Perform the ECU update in Auto Mode. If this fails, switch to Manual Mode.
2. ROM ID Verification: Select the VCMS system in GDS to scan the vehicle's current ROM ID. Compare this to the ROM ID information tables provided in the TSB to ensure the correct update is applied.
3. Post-Update Reset: After the ECU update completes, cycle the ignition OFF for at least 10 seconds (up to 30 seconds for some models) to reset the control unit.
4. Documentation: Take a screenshot of the "ECU Update Complete" screen and upload it to the STUI system.
5. Fault Code Clearing: Perform an "All Systems Fault Code" search and erase any DTC history that may have occurred during the ECU update process.
6. Operation Confirmation: Start the vehicle in Ready mode to confirm proper operation.

For more detailed instructions on tablet-based GDS-Smart ECU updates, technicians should refer to TSB 24-GI-012H.

Required Tools or Parts

The software update utilizes specific ECU part numbers for each model:

• IONIQ 5 (NE1): 35001-1XAA0
• IONIQ 6 (CE1): 35000-1XEA0
• Kona Electric (SX2 EV): 35000-0ELA0

ROM ID Information

The following tables detail the old and new ROM IDs for the Vehicle Charging Management System (VCMS) software update, corresponding to specific GDS Event Numbers:

Event #1051 (IONIQ 5 - NE1)

Model	MY	System	ECU Part Number	Old ROM ID	New ROM ID
IONIQ 5	22-24	VCMS	35001-1XAA0	ENEE1NM-CS1-D000 to ENEE1NM-CS9-D000	ENEE1NM-CSA-D000

Event #1071 (IONIQ 6 - CE1)

Model	MY	System	ECU Part Number	Old ROM ID	New ROM ID
IONIQ 6	23-24	VCMS	35000-1XEA0	ECEE2NM-CS1-D000 to ECEE2NM-CS7-D000	ECEE2NM-CS8-D000

Event #1144 (Kona Electric - SX2 EV)

Model	MY	System	ECU Part Number	Old ROM ID	New ROM ID
Kona Electric	24-25	VCMS	35000-0ELAO	ESX23NM-CS1-D000 to ESX23NM-CS5-D000	ESX23NM-CS6-D000

Warranty Information

For warranty claims related to this Service Campaign 9B5, dealers should use the following information:

• Operation Code: 40D079R0
• Operation: VCMS Software Update
• Operation Time: 0.3 M/H
• Causal Part: 35001-1XAA0 (IONIQ 5), 35000-1XEA0 (IONIQ 6), 35000-0ELAO (Kona Electric)
• Nature Code: I11
• Cause Code: ZZ3

Claims should be submitted as "Campaign" type. If a part replacement is needed and is under warranty, a separate claim should be submitted. For out-of-warranty parts, a Prior Approval request for goodwill consideration is required.

Owner Action

If your 2022-2024 Hyundai Ioniq 5, 2023-2024 Hyundai Ioniq 6, or 2024-2025 Hyundai Kona Electric is experiencing an "interrupted charging session" or "lower charging speed" with a Level 2 charger, contact your authorized Hyundai dealer. This software update, identified as Service Campaign 9B5 (TSB 24-01-051H-1), is performed free of charge as part of a service campaign. Ensure your dealer is IONIQ certified if you own an IONIQ 5 or 6. This update is crucial to maintaining optimal charging performance and preventing potential damage.

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Source: NHTSA ID: 11008013