2025 Hyundai Ioniq 5 No Start/Ready Mode TSB 26-BE-009H

Hyundai has released Technical Service Bulletin (TSB) 26-BE-009H to address a specific issue affecting certain 2025 Ioniq 5 (NEA EV) vehicles. Owners may encounter a "NO START OR UNABLE TO ENTER READY MODE" condition when attempting to start their vehicle by pressing the START/STOP Button (SSB).

This bulletin provides a detailed procedure for technicians to inspect the vehicle for this condition and, if necessary, replace the Body Domain Control (BDC) module. The goal is to restore normal vehicle operation and ensure the vehicle can properly enter "START/READY mode" when the START/STOP Button (SSB) is pressed.

Symptoms

The primary symptom owners will notice is the vehicle's inability to start or enter "START/READY mode" when the START/STOP Button (SSB) is pressed. This indicates a problem with the vehicle's readiness to drive.

Important Warnings for Owners

Hyundai has issued several critical notices related to this TSB:

• Certified Dealer Repairs: "To avoid any potential damage to IONIQ vehicles, IONIQ repairs can only be performed at IONIQ certified dealers." This means owners should not attempt to diagnose or repair this issue themselves.
• Key Fob Availability: "Ensure all customer Smart Keys are available before BDC replacement, as key reprogramming is required." If your BDC module needs replacement, make sure to bring all your smart keys to the dealership.
• Warranty Claims: The incident parts are subject to callback through the normal Warranty Technical Center (WTC) parts return process. "Claim is subject to debit if the part is not returned."
• VIN Input Caution: During the IAU teaching procedure, technicians are warned, "Caution: Take care in inputting the VIN because inputting of the wrong VIN five times may limit the use of this function." This highlights the precision required for the repair.

Diagnosis and Trigger Conditions

The diagnostic process begins with verifying the vehicle's condition. If the vehicle fails to enter "START/READY mode" after the START/STOP Button (SSB) is pressed, and it does not turn off when shifting between gears, this TSB's procedure should be followed. Initial checks include ensuring the key fob and vehicle battery are operating correctly, and that the vehicle locks and unlocks properly with the key fob.

Repair Procedure Summary

The repair process detailed in TSB 26-BE-009H involves several key steps, all performed by a Hyundai certified technician using specialized tools like the Global Diagnostic System (GDS):

1. Smart Key and START/STOP Inspection: Technicians first verify the proper function of the smart key and the START/STOP Button (SSB). If the vehicle does not enter "START/READY mode", further steps are required.
2. SMK Neutralization: The Smart Module Key (SMK) is neutralized using the GDS. This is a crucial step before replacing the BDC module.
3. IAU Neutralization: The Identity Authentication Unit (IAU) is also neutralized via the GDS.
4. BDC Module Replacement: The Body Domain Control (BDC) module is removed and replaced with a new unit. This involves disconnecting the negative battery terminal, removing various crash pad components, and carefully disconnecting and reconnecting the BDC module's connectors.
5. Key Fob Programming: After BDC module replacement, all customer smart keys must be reprogrammed to the vehicle.
6. BDC Variant Coding: The new BDC module is coded to the vehicle using the GDS, ensuring it functions correctly with the vehicle's specific configuration.
7. IAU Teaching: The Identity Authentication Unit (IAU) undergoes a teaching process, which involves inputting the vehicle's VIN into the GDS.
8. TPMS Learning: The Tire Pressure Monitoring System (TPMS) sensors are learned using the GDS and a TPMS Bluetooth Adapter.
9. Vehicle Operation Validation: Finally, the technician performs an all-systems fault code search to clear any incidental DTCs, and verifies that all key fob functions, "START/STOP mode" entry, and the absence of warning lights are normal.

Required Tools or Parts

Technicians will utilize the Global Diagnostic System (GDS) for various programming and neutralization steps. A TPMS Bluetooth Adapter is required for the TPMS learning process. A plastic trim tool is recommended for safely removing interior components. The primary replacement part is the Unit Assy – BDC (Part Number: 954A0-P1000).

Warranty Information

This repair is covered under normal warranty conditions. Technicians should submit claims as a “Warranty” type using operation code 95415R00. The Nature Code is I12 and the Cause Code is ZZ5. Repair justification photos, including VIN and mileage, are required as per the Digital Documentation Policy.

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Source: NHTSA ID: 11031396