How to reset emergency call malfunction BMW

This warning typically indicates an issue with the BMW SOS system, which is used to automatically contact emergency services in the event of a crash. The issue may be caused by:

• A faulty telematics control unit (TCU)

• Issues with the backup battery

• Wiring/connectivity problems

• Software glitches after battery replacement or coding

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Steps to Reset Emergency Call Malfunction on BMW

Step 1: Check Battery and Connections

• Ensure the main vehicle battery is fully charged.

• Check for loose or corroded battery terminals.

• If the car battery was recently changed or disconnected, the system might show this warning temporarily.

Step 2: Perform a Soft Reset (iDrive Reset)

1. Turn on the ignition (do not start the engine).

2. Press and hold the volume/mute knob on the iDrive controller for about 30 seconds.

3. The screen will turn off and restart — this resets the iDrive system.

4. Wait for the system to reboot and check if the warning disappears.

Step 3: Use a Diagnostic Tool (OBD)

If the warning remains:

1. Plug in a BMW-compatible OBD2 scanner (e.g., Carly, BimmerLink, or ISTA+).

2. Scan the vehicle for fault codes related to TCB (Telematics Control Box) or emergency call system.

3. Clear the error codes.

4. Restart the vehicle and check if the warning is gone.

Step 4: Update or Reprogram the System

• Some emergency call errors are caused by outdated software.

• Visit a BMW dealership or specialist to update the telematics module (TCB/MGU) or reprogram the system.

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When to Replace Hardware

If resetting and reprogramming don’t fix the issue, the Telematics Control Unit or backup battery inside it may be defective. Common solution:

• Replace the TCB module (around the rear right of the trunk).

• Requires coding and programming after installation.

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Note

• You can safely drive the car with this warning, but the SOS system will not function in emergencies.

• It does not affect engine performance or drivability, but it's best to fix it promptly.

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Let me know your BMW model and year if you want model-specific instructions.