2021-2023 Audi e-tron VAS6558A Connection Issue Hotfix

Symptoms of the VAS6558A Connection Issue

Technicians using the Offboard Diagnostic Information System (ODIS Service) may encounter connection problems with the VAS6558A diagnostic tool when performing tests on the high-voltage measurement module. Specifically, the system might display the message: "The wrong or no connected high-voltage test instruments were repeatedly detected." This prevents proper diagnosis of the high-voltage system in affected Audi e-tron vehicles.

This issue impacts 2019-2024 Audi e-tron vehicles when diagnostic procedures involving the VAS6558A and the "High-voltage measurement module - VAS 6558 A/B" test plan are performed. The hotfix resolves this Audi e-tron VAS6558A connection issue until a permanent update is released.

Important Warnings for Technicians

Audi has issued critical instructions regarding the installation and removal of this hotfix to ensure proper diagnostic functionality and prevent further issues. These warnings are crucial for technicians to follow:

• Single Device Installation: "We recommend installation of this hotfix on one diagnostic device ONLY."
• Immediate Removal: "Hotfix must be removed immediately after performing the procedure."
• Malfunction Risk: "The Hotfix must be removed after performing the procedure. Failure to do so will cause other vehicle diagnostics sessions to malfunction."

These warnings emphasize the temporary nature of the hotfix and the importance of adhering to the specified procedure to avoid disrupting other diagnostic tasks or causing other vehicle diagnostics sessions to malfunction.

Repair Procedure Summary

This hotfix involves downloading and installing a temporary software patch into the ODIS Service system, performing the necessary diagnostic procedure, and then uninstalling the hotfix. The process is as follows:

1. Download Hotfix:

   • Access AccessAudi.com via a web browser on the diagnostic device.
   • Navigate to Elsa2Go > Service References > Software/Hardware Updates.
   • Search for "AOS-25-19 eTron VAS6558A Hotfix Zip File".
   • Download and save the zip file to the Windows desktop.
   • Extract the contents of the zip file to the desktop.

2. Install Hotfix into ODIS Service:

   • Open ODIS Service as an administrator.
   • Expand the "Data" submenu and select "Download" under "Hotfix".
   • Confirm the workshop data patch import by clicking "Continue" when prompted "Should the workshop data patch be imported?".
   • Browse to the desktop, select the hotfix file, and click "Select Folder".
   • Confirm the successful installation by clicking "OK" when prompted "Workshop data patch was completed successfully."

3. Perform Diagnostic Procedure:

   • Proceed with the intended diagnostic procedure, specifically the "High-voltage measurement module - VAS 6558 A/B" test plan, which should now function correctly without the Audi e-tron VAS6558A connection issue.

4. Uninstall Hotfix from ODIS Service:

   • After completing the diagnostic procedure, select "Erase" under "Hotfix" in the ODIS Service "Data" submenu.
   • Confirm the deletion of the active workshop patch by clicking "Continue" when prompted "Should the active workshop patch be deleted?".
   • Click "OK" when prompted "The workshop data patch was erased."
   • Close ODIS Service.

Required Tools or Parts

To apply this hotfix, Audi technicians will need:

• ODIS Service software, specifically Audi brand version 2.37.5.
• The hotfix file: A_2.37.5_HVMT_20250408-091902_2.
• A diagnostic device with internet access to AccessAudi.com.
• The VAS6558A diagnostic tool and the "High-voltage measurement module - VAS 6558 A/B" test plan.

What Owners Should Know

This service information is primarily for Audi technicians and addresses an internal diagnostic tool issue. Owners of 2021-2023 Audi e-tron vehicles will not directly perform this hotfix. If your Audi e-tron requires diagnostics related to its high-voltage system and your technician encounters difficulties, this hotfix ensures they can properly diagnose and service your vehicle. There is no direct action required by vehicle owners.

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NHTSA ID: 11017612