2021-2026 Audi Emergency Call LED Not Green TSB

Owners of 2021-2026 Audi vehicles may notice that the emergency call LED in their car's roof module is not illuminating green. This condition indicates a potential issue with the eCall (emergency call) system, which is designed to automatically alert emergency services in the event of a serious accident. Audi has issued Technical Service Bulletin (TSB) 2079652/2 to provide dealerships with comprehensive diagnostic and repair instructions for this specific concern.

Symptoms

The primary symptom addressed by TSB 2079652/2 is the emergency call LED in roof module not lit up in green. This indicates that the eCall system is not in its normal, operational state. Depending on the underlying cause, the LED might be off, flashing red, or exhibiting other patterns.

Diagnostic Addresses / Modules

While no traditional Diagnostic Trouble Codes (DTCs) are explicitly listed, the TSB references specific diagnostic addresses and control modules where event memory entries may be found, indicating a fault. These include:

• Diagnostic address 0075: Associated with the OCU3 or OCU4 (Online Control Unit) and Connectivity Box (ConBox/CB_H_).
• Diagnostic address 0019: Associated with the Data Bus Diagnostic Interface (Gateway).
• J533: Data Bus Diagnostic Interface.
• J949: Emergency Call Module.
• J794: Control Unit for Information Electronics.
• Aerial module 8107: Related to GPS and general aerial function.

Damage codes such as A039 (emergency call LED not green), 0040, and 0039 are used for warranty claims to categorize the specific nature of the fault.

Diagnosis and Trigger Conditions

To properly diagnose why the Audi e-tron emergency call LED is not green, technicians are instructed to follow a specific procedure:

1. Vehicle Positioning: Move the vehicle to an open area to ensure adequate GPS and mobile phone reception.
2. Ignition Cycle: Switch on the ignition and wait for at least 30 seconds.
3. LED Evaluation: Observe the emergency call LED's behavior. The TSB provides a detailed timing chart for various LED flash patterns (e.g., 0.5-second intervals of green/red) and their corresponding statuses, such as "eCall ongoing," "eCall disabled," "Predelivery state," "Error," "eCall not available," or "eCall available."
4. Scenario-Based Troubleshooting: The TSB outlines six specific scenarios based on the LED status, guiding technicians on the next steps. For instance, if the eCall is disabled (Scenario 2) or in an error state (Scenario 4/5), further general test steps are required.

Repair Procedure Summary

If the emergency call LED still does not light up green after initial evaluation, the following general test steps and repair procedures are outlined:

1. Check for IT Errors: Verify if there's an IT error or disturbance listed under the "Breaking News" tab in the service portlet. If an outage is confirmed via the Customer Information Portal (CIP), or if multiple vehicles are affected without an IT error, Audi Digital Business Support (DBS) should be contacted.
2. Review Other TSBs: Check for any other relevant TSBs related to online services, the data bus diagnostic interface (J533), the emergency call module (J949), or the control unit for information electronics (J794). Any available software updates for these modules should be performed first.
3. Privacy Settings: Confirm that the vehicle's privacy settings are not active. If they are, deactivate them, put the vehicle into bus sleep mode, and then re-evaluate the LED status after restarting the ignition.
4. Emergency Call Module Restart: If the LED remains unlit green, perform a restart of the emergency call module (J949) using the "Control module restart" routine in ODIS (Offboard Diagnostic Information System). This involves navigating to "Select own tests > Diagnostic capable system > 0075 – Emergency call module – J949 > 0075 – Emergency call module, functions > 0075 – Control module restart." A critical notice warns that failure to follow instructions during this restart may cause irreparable damage to the emergency call system.
5. Terminal 30 Reset: If the issue persists after the module restart, disconnect the 12V vehicle battery to perform a terminal 30 reset. Refer to the Workshop Manual for detailed instructions.
6. New Vehicle Registration (Backend): If a terminal 30 reset does not resolve the problem, a new vehicle registration can be initiated in the backend via the service portlet. This involves pressing the "Reset control unit in backend" button under the "Vehicle communication" tab.
7. Vehicle Data Synchronization: If the control unit has already been replaced, technicians should press the "Vehicle data synchronization for backend" button under the "Vehicle data" tab in the service portlet.
8. Further Support: If the problem remains unresolved, all measured values from the emergency call module (diagnostic address 0075) should be read out, and Technical Assistance Center (TAC) should be contacted for further support.

This TSB also references TSB 2061028, which addresses "91 Audi connect GEN3/GEN4: No Services in MMI and SOS LED does not turn green after PDI," indicating related issues that might require attention.

Owner Action

If you own a 2021-2026 Audi and observe that your Audi e-tron emergency call LED in the roof module is not lit up green, it is recommended to schedule an appointment with an authorized Audi dealership. Since this is a technical service bulletin, the repair will typically be covered under warranty if your vehicle is still within the warranty period. The dealership will follow the diagnostic and repair procedures outlined in TSB 2079652/2 to identify and resolve the underlying cause of the eCall system malfunction.

NHTSA ID: 11027368