2025 Audi A5 Digital Key Removal Fails in MMI TSB 2078471/2

Owners of certain 2025 Audi models may experience problems with their Audi connect Digital Key, specifically when attempting to remove it from the MMI system or use it for vehicle access and starting. This issue, detailed in Audi Technical Service Bulletin (TSB) 2078471/2, points to a software-related fault within the onboard supply control unit.

This TSB, initially published on July 3, 2025, and revised on July 22, 2025, provides diagnostic steps and repair procedures for the 2025 Audi A5 digital key removal problem, as well as for other affected models.

Revision History

This Technical Service Bulletin 2078471/2 has undergone the following revisions:

• Revision 2 (July 22, 2025): Updated service instructions and revised warranty labor operations.
• Revision 1 (July 3, 2025): Initial publication of the bulletin.

Symptoms

Owners may notice several issues related to the digital key and vehicle access. The primary complaint is the inability to delete a digital key from the vehicle or a smartphone. Owners may state: "Unable to delete a digital key in the vehicle or on the smartphone." Additionally, the digital key may not function as intended, leading to problems such as: "The digital key also does not work (cannot unlock/lock or start vehicle) although the vehicle is online and has sufficient satellite reception and the ignition was not turned on using the digital key."

Specific functional failures include:

• Access Control Failures: Problems with locking/unlocking the vehicle, door release using a mobile device, key card, or keyless entry. The door locking mechanism might be partially or completely inoperable.
• Engine Start Problems: The digital key may not allow the engine to start, even when the vehicle is online and has sufficient satellite reception.
• Online Services Malfunctions: Issues with registration processes for central locking or engine start via mobile devices, or problems deleting the primary user.
• MMI and App Issues: Error messages related to mobile terminal applications or general online service functionality.

Technical Background

The root cause of these issues is identified as a software problem within the onboard supply control unit (J519).

Important Warnings

NOTICE: This bulletin may apply to vehicles still within the new model launch repair authorization period. For vehicles still in the launch phase, the workshop must create a case with the Technical Assistance Center (TAC) per the repair authorization. The TSB number 2078471/2 must be referenced in the first line of the TAC case.

Repair Procedure Summary

If you are experiencing a 2025 Audi A5 digital key removal failure or other related digital key malfunctions, your Audi dealer will follow a specific diagnostic and repair procedure:

1. Initial Checks: The technician will first confirm that the vehicle is online, has a valid time signal (sufficient satellite reception), and that the ignition was not activated using a digital key.
2. 12V Battery Terminal 30 Reset: If the digital key still cannot be deleted after the initial checks, the 12V battery will be reset using a Terminal 30 reset for at least 10 minutes. The conditions from step 1 must then be re-verified.
3. Waiting Period: After the reset, the vehicle must remain online for at least 24 hours, as attempts to delete the key will be performed again automatically during this period.
4. Onboard Supply Control Unit Replacement (if necessary): If, after waiting 24 hours, the digital key still cannot be deleted, the onboard supply control unit J519 will be replaced.

Warranty Information

This repair is covered under warranty if the vehicle is within its warranty period. If the vehicle is outside of warranty, this Technical Service Bulletin is for informational purposes only.

• Service Number: 9710
• Damage Code: 0039
• Claim Comment: As per TSB 2078471/2

Labor Operations for Terminal 30 Reset:

Operation Description	Labor Operation Number	Time Units (TU)
Loosen and secure earth strap	9785 0999	20 TU
GFF / Guided Functions	0150 0060	Labor according to the diagnostic log

Labor Operations for Terminal 30 Reset and Onboard Supply Control Unit Replacement:

Operation Description	Labor Operation Number	Time Units (TU)
Remove and install onboard supply control unit	9710 19xx	See SRT with associated operations
Loosen and secure earth strap	9785 0950	See SRT with associated operations
GFF / Guided Functions	0150 0060	Labor according to the diagnostic log

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

NHTSA ID: 2078471/2