2025-2026 Audi e-tron GT High-Voltage De-Energize Update

Audi has released Technical Service Bulletin (TSB) 90 24 34 2075473/1 to address a specific software-related issue affecting the high-voltage system in certain e-tron GT models. This bulletin, issued on October 1, 2024, outlines a necessary update to ensure the proper functioning of the high-voltage de-energization process. The primary focus of this TSB is to implement an Audi e-tron GT ZDC Update.

This issue primarily impacts 2025-2026 Audi e-tron GT and RS e-tron GT vehicles. While owners will not typically experience any noticeable symptoms, technicians may discover the problem during routine diagnostic work. The TSB provides detailed instructions for workshops to correct this condition.

Issue Description

The core problem identified in TSB 90 24 34 2075473/1 is that the automatic detection for de-energizing the high-voltage system does not function correctly. This means that when a technician attempts to de-energize the high-voltage system, the vehicle's diagnostic tools cannot automatically confirm that the system has been safely de-energized. Instead, the diagnostic test plan will automatically revert to a manual de-energization procedure, leading to additional diagnostic time and effort for the technician.

Technical Background

This malfunction stems from the absence of a new ZDC (target data container) for the Data Bus On Board Diagnostic Interface -J533-, specifically at diagnostic address 0019. The ZDC is a crucial software component that enables the diagnostic system to automatically verify the de-energized state of the high-voltage system. Without this updated ZDC, the system cannot perform its automated checks, necessitating manual intervention by the technician.

Important Warnings

Audi has issued a critical warning regarding the repair procedure for this issue:

• "To prevent charging of the high-voltage battery during the software update, the high-voltage cable is to be removed BEFORE entry of the SVM code on vehicles with high-voltage components."
• "Charging the high-voltage battery during a software update can damage the high-voltage components."

These instructions are vital for technician safety and to prevent potential damage to the vehicle's high-voltage components during the software update process. Owners should ensure their service facility is aware of and follows these precautions.

Repair Procedure Summary

The repair for this condition involves performing a software update using the ODIS tester. Technicians are instructed to follow these steps:

1. Access the ODIS tester and navigate to "Self test."
2. Proceed to "Diagnostic-capable systems."
3. Select "0019 - Data Bus On Board Diagnostic Interface -J533-."
4. Then, choose "0019 - Data Bus On Board Diagnostic Interface, functions."
5. Finally, select "0019 - SVM - check control module configuration."

The SVM (Software Version Management) system will automatically perform a check and apply any necessary corrections. If the SVM system detects and implements a correction, a subsequent SVM comparison must be performed. This Audi e-tron GT ZDC Update ensures the high-voltage system's de-energization process functions as intended.

Production Solution

Audi has already implemented the new ZDC in production vehicles starting from calendar week 48 of 2024. This means that newer vehicles manufactured after this period should not exhibit this particular issue.

Warranty Information

For eligible vehicles, this repair is covered under warranty. The TSB specifies the following details for warranty claims:

• Service Number: 9035
• Damage Code: 0039
• Labor Operations: GFF / Guided Functions (0150 0010 and 0150 0060)

Warranty claims must adhere to the Audi Warranty Policies and Procedures Manual, and claims are subject to review or audit by Audi Warranty. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance.

Source: NHTSA ID: 11009950