2023 Hyundai Ioniq 5 Charging Issue TSB: VCMS Update

Hyundai has issued Technical Service Bulletin (TSB) 23-EV-003H to address a specific 2023 Hyundai Ioniq 5 charging issue. This bulletin outlines a necessary software update for the Vehicle Charge Management System (VCMS) in affected vehicles. The update aims to correct conditions that can lead to charging interruptions and diagnostic trouble codes.

Symptoms

Owners of 2023 Hyundai Ioniq 5 (NE1) electric vehicles may experience one or both of the following issues related to the 2023 Hyundai Ioniq 5 charging issue:

• The vehicle intermittently stops charging before the charging process is complete.
• The EV Light illuminates on the dashboard, accompanied by the diagnostic trouble code (DTC) P1BAD, indicating "Charger Coupler Temperature Too High".

Fault Codes / DTCs

This TSB specifically addresses the following diagnostic trouble code:

Code	Description	Module
P1BAD	Charger Coupler Temperature Too High	VCMS

Diagnosis / Trigger Conditions

Technicians will identify the need for this update if a 2023 Hyundai Ioniq 5 presents with the described symptoms or the DTC P1BAD. The update involves the Vehicle Charge Management System (VCMS) and is identified in the Global Diagnostic System (GDS) as Event #927, described as "NE EV VCMS CHARGING CONDITION SOFTWARE LOGIC IMPROVEMENT". This indicates a specific software logic improvement designed to optimize charging conditions.

Important Warnings

Before performing the ECU update, technicians must observe critical battery voltage conditions to prevent update failures. If the GDS displays a warning indicating low battery voltage, specifically: "Warning! lower Battery Voltage. BATTERY VOLTAGE: 10.8", the vehicle's 12V battery must be charged. The vehicle should be run for at least 15 minutes to achieve an adequate battery state of charge. The ignition must be cycled OFF/ON before attempting the ECU update again.

Repair Procedure Summary

The repair involves updating the VCMS software using the Global Diagnostic System (GDS). The general procedure is as follows:

1. Initial Update Attempt: The GDS ECU update should first be attempted in Auto Mode.
2. Troubleshooting Auto Mode Failure: If the update begins but fails in Auto Mode, the technician should attempt to recover by performing the update in Manual Mode. This may require turning off the ignition for 30 seconds before retrying.
3. Advanced Recovery: If Manual Mode also fails, the 12V battery cables must be disconnected, and a cap discharge performed (connecting a bar or heavy wire between the positive and negative terminals) before re-attempting Manual Mode.
4. ROM ID Verification: Before proceeding with the software update, the technician must use the Auto Mode ID Check function to verify the current VCMS ROM ID.
5. Software Update: Perform the VCMS update in Auto Mode. The new ROM ID for the VCMS will be ENEE1NM-CS8-D000, replacing older versions such as ENEE1NM-CS1-D000, ENEE1NM-CS2-D000, ENEE1NM-CS3-D000, or ENEE1NM-CS4-D000.
6. Post-Update Reset: Once the ECU Upgrade process shows 100% completion, the ignition key must be cycled to the OFF position for at least 10 seconds to properly reset the control unit.
7. DTC Clearing: An All Systems Fault Code search must be performed, and any incidentally stored DTCs from the ECU update process must be erased.
8. Final Verification: The vehicle should then be started in Ready mode to confirm proper operation.

ROM ID Information

The following table details the Vehicle Control Unit (VCU) part number and the ROM IDs involved in this update:

VEHICLE	SYSTEM	MY	VCU P/No.	OLD ROM ID	NEW ROM ID
IONIQ5 (NE)	VCMS	22-23MY	39751-1XNN1	ENEE1NM-CS1-D000, ENEE1NM-CS2-D000, ENEE1NM-CS3-D000, ENEE1NM-CS4-D000	ENEE1NM-CS8-D000

Manual Mode Password

Should a manual update be required, the following password is used:

MENU	PASSWORD
NE EV VCMS 35001-1XAA0	8000

Required Tools or Parts

The primary action is a software update, but the TSB references specific part numbers for warranty and identification purposes:

• VCU Part Number: 39751-1XNN1
• Causal Part for Warranty: 35001-1XAAO

Owner Action

If you own a 2023 Hyundai Ioniq 5 and are experiencing intermittent charging issues or have seen the "EV Light On" with a "Charger Coupler Temperature Too High" message, you should contact your authorized Hyundai dealer. This software update is typically covered under warranty. The repair operation code for this VCMS Upgrade is 35001Q0C, with an estimated labor time of 0.3 hours.

NHTSA ID: 10233558