2024-2025 Audi e-tron GT MMI Software Update TSB 2079979

Owners of 2024-2025 Audi e-tron GT and RS e-tron GT vehicles may experience issues with various MMI functions or see an "Emergency call fault" message displayed in the instrument cluster. This problem is addressed by Technical Service Bulletin (TSB) 2079979/2, which outlines a software update for the MIB3 infotainment system and connectivity box, specifically for vehicles without the AED (Automated External Defibrillator) system.

This TSB, released on December 4, 2025, is a revision (Revision 2) of an earlier publication from November 19, 2025 (Revision 1). The revisions included adjustments to the header, VIN range, and the updated model table. The Audi e-tron GT MMI software update aims to correct underlying software issues causing these malfunctions.

Symptoms

Owners might notice a range of problems with their vehicle's MMI (Multi Media Interface) system. The most critical symptom is the display of an "Emergency call fault" message in the instrument cluster, which can indicate a problem with the vehicle's emergency communication system. Other general MMI function problems may also occur, impacting navigation, entertainment, or connectivity features. The TSB also notes that diagnostic entries logged in diagnostic address 0075 may be present.

Diagnosis / Trigger Conditions

Technicians can diagnose this issue by checking the software version in diagnostic address 5F of the vehicle. Affected vehicles will typically have one of the following software versions: 4014, 4026, 4318, or 4404. If a vehicle presents with these software versions and the described symptoms, the Audi e-tron GT MMI software update outlined in TSB 2079979/2 is applicable. This TSB may also be referenced by other TSBs in the context of a software update for multiple control units.

Important Warnings for Owners and Technicians

Audi has provided several crucial advisories regarding this software update:

• Do not perform Guided Fault Finding: For diagnostic entries that will be resolved by this TSB, the Guided Fault Finding test plans should not be carried out. These procedures cannot be invoiced under warranty, as the software update itself is the intended repair.
• Warranty Billing: When performing this TSB, time stamps are not required for billing under warranty. This allows technicians to work on other vehicles simultaneously or for non-productive personnel to perform the update. The update can also be performed by non-productive personnel.
• USB Media Requirements: Technicians must prepare the required USB-C sticks before starting the repair. It is critical to not use an SD card with an adapter USB stick. Additionally, do not use a USB-C stick with a larger storage capacity than specified (minimum USB 2.0 with 32 GB), as larger capacity sticks may have different formatting processes that can interfere with the update. The USB-C stick and downloading the software via the SD creator cannot be invoiced. Further information on USB-C sticks for software updates can be found in TSB 2060523, "91 MIB3: Software Update Instructions."
• User Input Notifications: During the update process, the vehicle will use acoustic signals and flashing lights to indicate when user input is required and when the test program has completed.
• Interrupted Procedure: If the update procedure is interrupted, it must be repeated from step 1. The test program will then automatically complete any missing parts of the update.

Repair Procedure Summary

The repair involves a software update for the emergency call module (0075), gateway (0019), and information electronics (005F). The process for the Audi e-tron GT MMI software update is as follows:

1. Software Update for Control Units: The update targets the emergency call module (0075), gateway (0019), and information electronics (005F).
2. Software Version Determination: The technician first determines the current software version in diagnostic address 0019 using SVM code DUCIDENT0019. This is part of the "SVM – Authorized Multiple Code Entry" function. The TSB includes QR codes as visual aids for scanning the appropriate SVM code chains.
3. SVM Code Chain Application: Based on the determined software version, the appropriate SVM code chain is applied. For software version 0042 in diagnostic address 0019, the code chain is DUCDTCPR0075MLB, FLIGHTON0075MLB,ZGDOIP,CL3BPA001US,19A027,19B027,TGU1MDMVB,CL3BPA002US,FLIGHTOFF0075MLB. A similar code chain, DUCDTCPR0075MLB, FLIGHTON0075MLB,ZGDOIP,CL3BPA001US,TGU1MDMVB,CL3BPA002US,FLIGHTOFF0075MLB, is used for all other software versions in diagnostic address 0019.
4. Software Update Execution: The update media, prepared on a USB-C stick, is used. The test program will guide the technician through the process, initially prompting for USB insertion. The automatic execution of software updates results in inactive time, during which technicians can work on other vehicles. The USB-C stick can be removed after the program completes.
5. Bus Sleep Mode: After the software update is complete, the vehicle must be put into bus sleep mode. Following this, the ignition is switched back on, and the MMI system is started.
6. Emergency Call LED Check: The technician verifies that the emergency call LED in the roof module lights up green. If it does not turn green, a separate TSB (2079652, "Emergency call LED in roof module not lit up in green") should be consulted.
7. End Diagnostic Session: The diagnostic session is concluded, and the diagnostic log is sent online.

Required Tools and Parts

To perform this update, technicians will need:

• USB-C Sticks: Minimum USB 2.0 with 32 GB capacity. These are used to download the software update media. The update media can be used for multiple vehicles.
• ODIS Software: The diagnostic tester being used must have the latest ODIS update to utilize the newly developed test program for inputting the SVM code.
• Software Part Numbers: Depending on the vehicle's current MIB3 software version, specific part numbers are required:
  • For MIB3 SW versions 4014, 4026, 4404: Part number 8W0906961GB
  • For MIB3 SW version 4318: Part number 8W0906961GF

Warranty Information

This Technical Service Bulletin provides specific warranty details for the repair:

• Claim Type: If the vehicle is outside of any warranty, this TSB is informational only.
• Service Numbers:
  • For complaints about online services or the emergency call function: 9145
  • For complaints about MMI functions: 9196
• Damage Code: 0041
• Labor Operations:
  • Prepare repair (includes vehicle parked, charge 12V battery): Operation code 0151 0010, 20 Time Units (TU)
  • Launch software update for MMI and emergency call module (includes connect tester, start ODIS, flash mode, function Authorized Multiple Code Entry, copy/paste code chain, insert USB stick, program runs automatically): Operation code 0151 0040, 60 Time Units (TU)
• Claim Comment: Claims should be submitted "As per TSB 2079979/2."

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual. Claims are subject to review by Audi Warranty. The new software for affected control units was implemented in production for model year 2025 vehicles.

NHTSA ID: 10200833 ```