2025 Audi A5/Q5/S5/SQ5 Cannot Unlock or Lock TSB

Audi has released Technical Service Bulletin (TSB) 2078793/2 to address a concern where certain 2025 Audi A5, Q5, S5, and SQ5 vehicles cannot be unlocked or locked. This bulletin, with a release date of October 14, 2025, provides important information for owners experiencing this specific issue, particularly those utilizing a digital key.

Symptoms of the Unlocking/Locking Issue

Owners of affected Audi models, including the 2025 Audi A5, Q5, S5, and SQ5, may observe several symptoms related to the vehicle's access control system. The primary complaint is that the vehicle cannot be unlocked or locked using any method, including the remote control key, keyless entry, or a mobile device with a digital key.

Another key indicator is that the LED on the remote control key may not flash when a button is pressed while near the vehicle. Furthermore, when attempting to lock the vehicle via the Audi app, owners might encounter the verbatim message: "Please switch off the ignition," even if the ignition is already off. In some cases, the only way to unlock or lock the vehicle is by using the physical door lock cylinder.

Important Warnings and Conditions

It is crucial to note that TSB 2078793/2 specifically applies under certain conditions. This bulletin is relevant only if a key user has already been added to the vehicle and a digital key is actively being used. Additionally, the TSB's recommended procedure is applicable only if the issue can be resolved using the steps described in the customer statement portion of the document.

If you are uncertain, it is advised to verify whether the issue was successfully reproduced with the device on which the digital key is installed. Should the vehicle remain unable to start after it has been unlocked, technicians are instructed to check for any other open field campaigns that might be affecting the vehicle.

Temporary Workaround for Access

For immediate access to a vehicle experiencing this 2025 Audi A5 cannot unlock or lock issue, Audi provides a temporary workaround. If the device with the digital key installed is outside the vehicle's range (approximately 132 feet), or if the device's Bluetooth is switched off, and approximately 15 minutes have passed without any activity (allowing the vehicle to enter a deep bus sleep state), the vehicle can then be unlocked and locked using the remote control key. Once the vehicle has been successfully unlocked using this method, it should be possible to start it without any further problems.

Diagnosis and Affected Components

Workshop findings confirm that the customer's reported symptoms can be reproduced. The underlying cause for the 2025 Audi A5 cannot unlock or lock condition is linked to the vehicle's electrical system. Specifically, the onboard supply control unit J519 is implicated. This control unit, identified as