2025 Audi A5 / S5 Connect Not Working, Red SOS LED

Owners of 2025 Audi A5 and S5 models may encounter problems with their Audi Connect online functions, often indicated by a red SOS LED or an inoperative emergency call system. This Technical Service Bulletin, identified as TSB 2077319/2, provides a detailed guide for technicians to diagnose and resolve these issues.

This bulletin was initially published on December 10, 2024, and revised on August 15, 2025, to update its header. It specifically applies to vehicles built on the PPE platform, including the 2025 Audi A5 (FU) and 2025 Audi S5 (GF) models. The primary concern is the functionality of online services, telematics, and the emergency call button.

Symptoms

Customers report that "The online functions do not work." Additionally, the "emergency LED and/or online roadside assistance call LED is on/flashes red or is off." This indicates a failure in the vehicle's connectivity features, which are crucial for safety and convenience. The core issue is the "2025 Audi A5 Connect not working" as expected.

Fault Codes / DTCs

Importantly, workshop findings indicate that "No relevant DTCs are stored" in connection with this issue. This means the problem with the red SOS LED or inoperative Audi Connect functions does not trigger a diagnostic trouble code, requiring technicians to follow specific diagnostic procedures outlined in the TSB.

Diagnosis / Trigger Conditions

To diagnose the "2025 Audi A5 Connect not working" issue, technicians should first ensure the vehicle has the most recent software version and that any open campaigns have been performed. Subsequent checks include:

• Verifying if privacy settings are active.
• Confirming that mobile data is activated.
• Checking for any emergency call-related messages displayed in the instrument cluster.
• Observing the mobile phone reception icon on the MMI screen.

If these initial checks do not resolve the problem, further steps involve documenting the MMI screen's mobile network reception, the status LEDs on the roof module (emergency call and roadside assistance), and any instrument cluster messages through photographs.

Repair Procedure Summary

The repair process for the 2025 Audi A5 Connect not working issue involves several key steps:

1. Software and Campaign Check: Ensure the vehicle's software is up-to-date and all open service campaigns are completed.
2. System Configuration Verification: Check privacy settings, mobile data activation, and any emergency call messages in the instrument cluster. Observe the mobile phone reception icon on the MMI screen.
3. Documentation: Take photos of the MMI screen (showing reception), the roof module (LED status), and any instrument cluster messages.
4. Module Reset: Perform a Terminal 30 reset by turning the vehicle off for one minute, then cycling it back on. If the issue persists, reset the relevant control module within the Service Portlet, under the Vehicle Communication Tab.
5. Measured Value Block Analysis: Read measured value blocks for the 0075 emergency call module. Specifically, check the