2023 Audi MLB Evo Gateway Software Update TSB 2078077/1

Audi has released Technical Service Bulletin (TSB) 2078077/1, effective May 22, 2025, to address potential functional restrictions stemming from the gateway control unit's software. This bulletin primarily concerns the Audi MLB evo gateway software update for various 2023 Audi models, ensuring proper operation of critical vehicle systems.

The TSB highlights that these issues are typically identified during pre-delivery inspection (PDI) or other diagnostic work, rather than being reported by customers directly. The workshop is notified of this TSB via the ODIS diagnostic system, with the complaint type noted as "control modules, services -> error message" or "control modules, services -> software faulty" for the workshop code.

Symptoms and Technical Background

The core of the issue lies with the data bus diagnostic interface, commonly known as the gateway control unit (J533, diagnostic address 0019). In certain 2023 Audi vehicles, this gateway unit may experience restrictions when writing data under specific conditions. This can lead to a range of functional limitations, which technicians might identify as a "Connection offline" message or a general "control modules, services -> error message" indicating "software faulty" conditions.

These restrictions can specifically impact several key vehicle operations, including:

• Deactivating transport mode during vehicle preparation.
• Activating the swap function, which allows for feature upgrades.
• Commissioning and flashing other control units within the vehicle.
• Adapting the 12V battery system.
• Commissioning the high-voltage system, particularly relevant for hybrid and electric models like the e-tron and e-tron GT.

Such limitations can hinder proper vehicle setup and maintenance, making the Audi MLB evo gateway software update crucial for ensuring full functionality.

Affected Control Units and Software

The software update targets the Data Bus OBD Interface, identified by diagnostic address 0019 (J533). The following software and hardware part numbers are associated with this control unit, all requiring an update if the software version is 0025:

Diagnostic Address	Software Part Number	Software Version	Hardware Part Number	Hardware Version
0019 - Data Bus OBD Interface	4KE.907.468.M	0025	4KE.907.468.L	H06
0019 - Data Bus OBD Interface	4KL.907.468.M	0025	4KL.907.468.L	H06
0019 - Data Bus OBD Interface	4KR.907.468.M	0025	4KR.907.468.L	H06

New software has been introduced in production from week 50/23 onwards to address these issues.

Important Warnings and Owner Information

There are several critical points for technicians and owners to be aware of regarding this update:

• High-Voltage Vehicles: For vehicles equipped with high-voltage components (such as the Audi e-tron and e-tron GT models), a critical safety measure must be observed during this software update. To prevent potential damage to high-voltage equipment, the high-voltage charging cable MUST be unplugged BEFORE the SVM (Software Version Management) code is entered into the diagnostic system. Failure to do so could result in damage if the high-voltage battery attempts to charge during a software update.
• Exact SVM Code Input: The required SVM code, ZGDOIP,19A025, must be input exactly as written, including the comma and without any spaces. Audi strongly recommends copying and pasting this code to avoid errors.
• Software Modifications: Owners should be informed that this software update may neutralize previous modifications to the vehicle's software performed by the customer or other third parties (e.g., tuning or retrofitting).
• Declining the Update: If a customer declines the software update, they should be informed that this could lead to continued issues or restrictions with the use of the vehicle or individual components.

Repair Procedure Summary

The repair, outlined in TSB 2078077/1, involves updating the software of the data bus diagnostic interface (J533) control unit. This process requires the ODIS diagnostic tester and specific steps:

1. Initial Software Version Check: Before beginning the update, technicians must check the current software version of the J533 (0019) control unit. If the software version is 0025, the vehicle is eligible for this TSB and the update should proceed.
2. High-Voltage Cable Disconnection (if applicable): For vehicles with high-voltage components, unplug the high-voltage charging cable BEFORE proceeding with the SVM code entry.
3. Software Update via ODIS: Connect the ODIS tester to the vehicle. The J533 control unit must be updated using the SVM system in "Flash" mode. The new test program for software updates is included in ODIS software, available as of April 16, 2025.
4. SVM Code Entry: Use the "Authorized Multiple Code Entry" function within ODIS. The required SVM code is 19A025. Input the code exactly as ZGDOIP,19A025.
5. Follow ODIS Instructions: The vehicle will use acoustic signals and flashing lights to indicate when user input is required during and at the end of the test program.
6. Post-Update Steps: After the update has been completed, it is absolutely necessary to unplug the diagnostic connector and the charger from the vehicle.
7. Vehicle Cycle: Start the engine and let it run for one minute. Then, lock the vehicle and wait for five minutes.
8. Finalize Diagnostic Procedure: Once these steps are completed, the diagnostic procedure can be finalized via ODIS to delete any event memory entries created during the flashing process.

This Audi MLB evo gateway software update ensures the proper functioning of critical vehicle systems.

Warranty Information

Warranty claims for this software update are processed under specific codes:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 9035
• Damage Code: 0039
• Labor Operations:
  • Software update: 0151 0010 (See SRT with associated operations)
  • Software update: 0151 0060 (Time stated on the diagnostic protocol)
• Claim Comment: As per TSB 2078077/1

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 10252554