2025 Audi A3/S3 Onboard Supply Unit Mileage Issue TSB

Owners of 2025 Audi A3 and S3 vehicles may encounter a specific problem after the onboard supply control unit, identified as J519 (Diagnostic address 0009), has been replaced. This issue, detailed in Technical Service Bulletin (TSB) 97 24 11 2075086/2, prevents the new control unit from activating correctly. As a result, the workshop tester may fail to activate the unit, or the vehicle's mileage cannot be written to the new component.

This TSB, revision 2 dated December 17, 2024, supersedes a previous bulletin, Group 97 number 24-09 dated September 6, 2024, to provide updated procedures for resolving this system-related data writing issue. The problem stems from a system-related issue when writing data to the onboard supply control unit.

Symptoms

The primary symptom of this issue is the inability to correctly activate a newly replaced onboard supply control unit J519. Owners or technicians may observe that "Control unit activation with the workshop tester fails" or that the "mileage cannot be written" to the vehicle after the replacement. This indicates a failure in the proper initialization and data synchronization of the new control unit.

Important Warnings for Technicians

Audi has issued critical warnings for technicians performing this repair to ensure proper procedure and prevent further complications:

• "You must not return the vehicle to the customer!"
• "You must not perform a road test!"
• "The mileage MUST remain the same until the token supplied by manufacturer is successfully written and the coding process completes."

These warnings emphasize the importance of completing the entire token exchange and coding process before releasing the vehicle or conducting any road tests.

Diagnosis / Trigger Conditions

This condition typically arises after the onboard supply control unit J519 has been replaced. The replacement might be due to a Guided Fault Finding diagnosis, a fault analysis, or as part of a repair measure from another TSB. The core problem is a system-related issue that prevents data from being written correctly to the new control unit, leading to activation failure and the inability to record mileage.

Repair Procedure Summary

The repair for the "Audi S3 mileage cannot be written" issue involves a multi-step process focused on proper control unit replacement and activation, including a token exchange with the manufacturer. Here's a summary of the steps:

1. Record Mileage: Before replacing the onboard supply control unit, accurately note the vehicle's current mileage. For vehicles displaying mileage in miles, read the value in "kilometers" via measured values using the diagnostic tool.
2. Software Requirements: Ensure the diagnostic system meets the minimum software versions: ODIS-S version 24.1.1 or higher, Audi brand software version 2024.08.00 / 2.34.8, and Main feature 240101.201.60.
3. Replace Control Unit: Replace the onboard supply control unit J519 using the diagnostic test plan "0009 - Replace control module."
4. Obtain Token: During the replacement test plan, a unique token from the onboard supply control unit will be displayed on the vehicle diagnostic tester.
5. Submit Support Request: Copy this token and send it to the manufacturer via the "Help - Support - Support request" button, along with the previously noted mileage and the diagnostic log. When creating the ODIS Service support ticket, select "Software error" and "Limited order editing functions possible," then attach the current diagnostic session.
6. Receive and Apply New Token: Once the manufacturer provides a new token, copy and paste it into the subsequent step of the test plan.
7. Verify Mileage: After the test program successfully completes, verify that the mileage is correctly displayed in the instrument cluster.

Required Tools or Parts

To perform this repair, technicians will need access to the Audi diagnostic system with specific software versions:

• ODIS-S version: 24.1.1 or higher
• Audi brand software version: 2024.08.00 / 2.34.8 or higher
• Main feature: 240101.201.60 or higher

No specific part numbers for the onboard supply control unit J519 are listed in this TSB, as it focuses on the activation process after replacement.

Owner Action

If you own a 2025 Audi A3 or S3 and experience issues with your onboard supply control unit J519 after replacement, particularly if the "Audi S3 mileage cannot be written" message appears or the control unit fails to activate, you should contact your authorized Audi dealership. This repair requires specialized diagnostic tools and a specific token exchange process with the manufacturer, as detailed in TSB 97 24 11 2075086/2. Warranty claims for this issue are processed under Service Number 9710 and Damage Code 0039, with labor operations GFF / Guided Functions (0150 0010 and 0150 0060).

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Source: NHTSA ID: 11012535