2025 Audi A5/S5/Q5/SQ5 Unlock/Lock Issue TSB 2078793/3

Owners of certain 2025 Audi models may encounter a frustrating Audi unlock lock issue where their vehicle cannot be unlocked or locked using conventional methods. This problem, officially detailed in Audi Technical Service Bulletin (TSB) 2078793/3, often presents with a 'Connection offline' message and can impact the functionality of the digital key.

This TSB, last revised on November 10, 2025, provides diagnostic steps and repair procedures for technicians to address the underlying cause of this Audi unlock lock issue, ensuring proper vehicle access and security.

Revision History

Audi TSB 2078793 has undergone several revisions to refine the diagnostic and repair procedures:

• Revision 3 (November 10, 2025): This is the latest version, which revised the condition description by adding a model table and updating verbiage. It also revised the service instructions to include KD2 update instructions and updated labor operations for warranty claims.
• Revision 2 (October 14, 2025): This revision focused on updating the service section with further information regarding the solution.
• Revision 1 (August 01, 2025): This was the initial publication of the Technical Service Bulletin.

Important Warnings for Owners

Audi has issued specific advisories regarding this Audi unlock lock issue:

• Digital Key Requirement: This TSB 2078793/3 specifically applies only if a key user has already been added for the vehicle and a digital key is being used.
• Remedy Scope: This TSB only applies if the issue can be remedied using the procedure described in the customer statement. If in doubt, it is crucial to check whether the issue was reproduced with the device on which the digital key is installed.
• Starting Issue: If the vehicle cannot be started after it is unlocked, please check whether there are any open field campaigns for the vehicle.

Symptoms of the Unlock/Lock Issue

Owners may notice several symptoms indicating the Audi unlock lock issue:

• General Unlock/Lock Failure: The vehicle cannot be unlocked or locked using any method, including the remote control key or the Audi app.
• Key Fob LED: The LED on the key fob does not flash when a button is pressed while near the vehicle.
• App Message: When attempting to lock the vehicle via the Audi app, the message "Please switch off the ignition” may appear, even if the ignition is already off.
• Limited Access (Q5 and Q6 e-tron): For Audi Q5 and Q6 e-tron models, the vehicle might only be unlocked or locked via the physical door lock cylinder.

Diagnosis and Trigger Conditions

Workshop findings confirm that the customer's reported symptoms can be reproduced. The issue is linked to a 'Connection offline' status, particularly affecting vehicles utilizing a digital key. The problem manifests as the vehicle being unable to be unlocked or locked by any method, with the key's LED not flashing when a button is pressed near the vehicle. The Audi app may also display the message "Please switch off the ignition" even when the ignition is off.

Repair Procedure Summary

Addressing the Audi unlock lock issue involves a multi-step approach, starting with a temporary workaround and progressing to software updates or component replacement. The service procedure is outlined as follows:

1. Temporary Workaround for Access: If the device with the digital key is outside the vehicle's range (approximately 132 feet) or its Bluetooth is switched off, and about 15 minutes have passed without any activity being performed on the vehicle (deep bus sleep), the vehicle can then be unlocked and locked using the remote control key. Once unlocked, the vehicle can be started without problems.
2. Software Update Check: If the complaint can be resolved by the temporary workaround, technicians should then check for the availability of TSB 2079690, titled "00 Combined software update 03.10.00/C (28.13.01) KD2", for the affected vehicle. If this specific software update is available, the technician must perform the software update procedure described in TSB 2076960.
3. Digital Key Management during Update: When performing TSB 2079690, it is imperative to precisely observe the process for deleting and creating a digital key both before and after the software update. This step is crucial for ensuring proper functionality post-update.
4. Control Unit Replacement: If TSB 2079690 is not yet visible or applicable for the vehicle, the onboard supply control unit J519 must be replaced to resolve the customer's complaint. This hardware replacement serves as an alternative solution when the software update path is not viable.

Warranty Information and Labor Operations

Audi has specified particular labor operations and damage codes for warranty claims related to TSB 2078793/3. It is important to note that if the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.

The Service Number associated with this TSB is 9710.

For Software Update (according to TSB 2079690):

• Damage Code: KD02
• Labor Operations:
  • 0151 0010: This operation covers the software update itself, including the necessary step of connecting a battery charger to maintain stable voltage during the process. This operation refers to the Service Repair Time (SRT) for associated tasks.
  • 0151 0040: This is a fixed-rate labor operation for the software update, encompassing all required preliminary and follow-up work. This includes procedures such as the bus sleep cycle, calibration drive, any additional work, and restarting the software update if flashing is aborted. This operation is valued at 130 TU (Technical Units).

If TSB 2079690 is not yet visible and control unit J519 is replaced:

• Damage Code: 0039
• Labor Operations:
  • 9710 19xx: This operation covers the removal and installation of the onboard supply control unit J519. This also refers to the SRT with associated operations.
  • 0150 0060: This operation pertains to Guided Functions (GFF), with labor recorded according to the diagnostic log generated during the repair process.

All warranty claims must adhere strictly to the Audi Warranty Policies and Procedures Manual. Claims are subject to review or audit by Audi Warranty. The required claim comment for this procedure is "As per TSB 2078793/1". When performing the combined software update, time stamps are not required for billing under warranty, allowing technicians to work on other vehicles simultaneously, and the update can be performed by non-productive personnel.

Owner Action

If you own a 2025 Audi A5, S5, Q5, or SQ5 and are experiencing the Audi unlock lock issue or seeing the 'Connection offline' message, it is recommended to contact your authorized Audi dealership. Inform them about the symptoms and mention Audi Technical Service Bulletin (TSB) 2078793/3. The dealership technicians can diagnose the problem and perform the necessary software updates or component replacements as outlined in the bulletin. Always check with your Parts Department and/or ETKA for the latest information and parts bulletins, and ensure the Repair Manual is consulted for fasteners, bolts, nuts, and screws that require replacement during any repair.

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Source: NHTSA ID: 11026222