2025 Audi A5/S5 Digital Key Not Adapting TSB 2078794/1

Audi has released Technical Service Bulletin (TSB) 2078794/1, effective August 1, 2025, to address concerns regarding the digital key not adapting in certain 2025 Audi A5 and S5 models. This issue can lead to various problems with keyless entry and vehicle access, often accompanied by messages in the myAudi app or the vehicle's display.

The TSB provides detailed information for technicians to diagnose and resolve situations where the 2025 Audi A5 digital key or S5 digital key fails to adapt, ensuring proper functionality of the keyless entry and anti-theft systems.

Symptoms

Owners of affected 2025 Audi A5 and S5 vehicles may experience several issues related to the digital key. The primary complaint is that the digital key cannot be adapted, often indicated by a message appearing in the myAudi app. Additionally, drivers might encounter various problems with the keyless entry system.

These symptoms can manifest as:

• Messages on the driver information system (DIS), multi-function indicator (MFI), or multimedia interface (MMI) stating "keyless entry system."
• The keyless entry system may activate unexpectedly or fail to activate when needed.
• Partial or complete malfunction of the keyless entry door release or keyless closing door locking mechanism.
• The digital key's functionality might be completely absent or operate with an incorrect sequence.
• Connection errors and/or a message that the vehicle key (digital key) cannot be added.

Specifically, the TSB notes various complaint types related to the digital key functionality:

• Keyless entry system message activates: The message "keyless entry system" appears, and the function activates.
• Keyless entry door release partially out of order: The door release function for keyless entry is only partially operational.
• Keyless closing door locking mechanism partially out of order: The keyless locking function for doors is only partially operational.
• Keyless entry system message does not activate: The "keyless entry system" message does not appear, and the function does not activate.
• Keyless entry system message activates without cause: The "keyless entry system" message appears without a specific trigger.
• Keyless entry door release has no function: The keyless entry door release is completely inoperative.
• Keyless entry door release operation sequence incorrect: The keyless entry door release functions, but not in the expected order.

Technical Background

The root cause of the 2025 Audi A5 digital key adaptation issue lies in the basic settings of the RSAD (Relay Station Attack Defense) modules. These control units are crucial for break-in protection and rely on Bluetooth-based functions. If the basic settings for these RSAD modules are not performed correctly, it restricts their Bluetooth capabilities, preventing the digital key from being adapted properly.

Audi implemented changes to its production procedure for these modules starting April 10, 2025, to prevent this issue in newly manufactured vehicles.

Repair Procedure Summary

To resolve the 2025 Audi A5 digital key adaptation problem, technicians are instructed to perform a basic setting for all control units responsible for break-in protection. This procedure must be carried out using the relevant ODIS test program.

Technicians can locate this specific test program under diagnostic address 0009 or by utilizing the search function within the ODIS system. This process aims to correctly configure the RSAD modules, thereby restoring proper Bluetooth functionality and allowing the digital key to be adapted.

If, after performing this basic setting, the digital key still cannot be adapted, technicians are advised to refer to TSB 2077331. This separate bulletin addresses situations where the "91 Audi Connect Digital Key activation cannot be completed in the MMI."

Warranty Information

Warranty claims for this issue, identified by Transaction No. 2078794/1, must adhere to the Audi Warranty Policies and Procedures Manual. The specific warranty details are as follows:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 9667
• Damage Code: 0011
• Labor Operations:
  • GFF / Guided Functions (Code: 0150 0010) - Refer to the SRT (Standard Repair Time) for associated operations.
  • GFF / Guided Functions (Code: 0150 0060) - Labor time is determined according to the diagnostic log.
• Claim Comment: As per TSB 2078794/1

All submitted warranty claims are subject to review and audit by Audi Warranty.

Important Warnings

Owners should be aware that if their vehicle is no longer under warranty, this Technical Service Bulletin serves as informational guidance only. In such cases, repair costs may not be covered by Audi, and the owner may be responsible for expenses related to diagnosing and resolving the 2025 Audi A5 digital key issue.

NHTSA ID: 10243455