2023-2024 Audi MLB Evo Gateway Software Update TSB

Audi has issued Technical Service Bulletin (TSB) 2078077/2, released on September 25, 2025, to address software-related functional restrictions in various 2023-2024 MLB Evo platform vehicles. This includes models such as the A6, A7, A8, Q7, Q8, e-tron, and e-tron GT. This bulletin outlines a necessary software update for the data bus diagnostic interface, also known as the gateway control unit (J533).

The Audi MLB evo gateway software update aims to correct issues that can arise from restrictions in data writing capabilities within the gateway module. These restrictions can affect critical vehicle functions and lead to various operational problems, often reported as "control modules, services -> error message" or "control modules, services -> software faulty."

Revision History

This Technical Service Bulletin has undergone revisions since its initial publication. Revision 1 was initially published on May 22, 2025. Revision 2 included a revised header that added Model Year 2024 vehicles and updated the verbiage in the Technical Background section.

Symptoms and Technical Background

Owners of affected Audi vehicles may experience functional restrictions due to the gateway module's inability to properly write data under certain conditions. This can manifest as issues when deactivating transport mode (PDI), activating the swap function, activating and flashing control units, adapting the 12V battery, or activating the high-voltage system. These problems are often reported as "control modules, services -> error message" or "control modules, services -> software faulty."

Important Warnings for Owners

• High-Voltage Vehicles: For vehicles equipped with high-voltage components, it is crucial to unplug the high-voltage charging cable BEFORE the SVM code is entered during the software update. Failure to do so could result in damage to the high-voltage equipment if the battery charges during the update process.
• Declining the Update: If a customer chooses to decline this software update, they should be informed that this decision could lead to continued issues or restrictions with the use of the vehicle or its individual components.

Affected Control Units and Software/Hardware

The software update specifically targets the 0019 - Data Bus OBD Interface, also known as the J533 control unit. The bulletin applies if the current software version of this control unit is 0025.

Diagnosis and Repair Procedure

Before proceeding with the Audi MLB evo gateway software update, technicians must check the current software version of the J533 control unit (diagnostic address 0019). If the software version is 0025, the TSB procedure should be followed.

The update is performed via SVM (Software Version Management) using the ODIS tester in "Flash" mode. The required SVM code for this procedure is 19A025. Technicians must input the code exactly as written: "ZGDOIP,19A025", using the "SVM – Multiple authorized code inputs" function. The ODIS software, which includes the new test program for software updates, became available as of April 16, 2025.

During the process, the vehicle uses acoustic signals and flashing lights to indicate when user input is required. After the update is complete, it is essential to unplug the diagnostic connector and the charger from the vehicle. The engine should then be started and allowed to run for one minute, followed by locking the vehicle and waiting for five minutes. Finally, the diagnostic procedure can be completed via ODIS to delete any event memory entries created during the flashing process.

Warranty Information

This software update is generally covered under warranty if the vehicle is within its warranty period. For vehicles outside of warranty, this Technical Service Bulletin serves as informational guidance only, suggesting potential costs for the owner. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 11023784