Does an SOS malfunction message appear on your BMW iDrive screen? Learn how to troubleshoot and fix it by following the procedures below.

The BMW TCU module is located in the trunk area, but fault codes stored in the TCU can be read via the YOUCANIC full system scanner. BMW TCU module contains the Bluetooth module.



A defective TCU module can prevent your phone from connecting to the car via Bluetooth. TCU and your Bluetooth handset communicate via the antenna connected to the TCU.

When your BMW TCU module fails, you may notice:

  • SOS malfunction message on iDrive screen.

How to Diagnose BMW TCU Module

If you are experiencing problems, a good starting point is to read fault codes from the TCU module.

If any code shows PRESENT status, the problem needs to be fixed before the code can be cleared.

What you will need

For this step, you will need a diagnostic scanner capable of reading and clearing codes from the BMW TCU module.


These general instructions may vary depending on the diagnostic scanner model you use to troubleshoot BMW vehicles.

  1. Plugin the OBD-II scanner into the diagnostic port under the dashboard.
    diagnose-bmw-TCU-fault code-via-obd2-port
  2. Turn on the ignition; don’t start the engine.turn-on-bmw -ignition-to-read-TCU-fault-codes
  3. Turn on the scanner and select your BMW chassis. Next, Select the Control Units codes
  4. Select the TCU control unit list
  5. Once you enter the TCU module, you can do the following.
    • Read Codes from TCU Module
    • Clear Codes from TCU Module
    • Perform Adaptations, Activations, Tests

Verify that it supports your BMW model and year when purchasing a BMW scanner. Full system scanners that work on BMW vehicles can range from $150 to $800. Learn more about popular BMW scanners here.

Buy BMW TCU module

You can buy a BMW TCU from your dealer or purchase a BMW TCU Module on eBay online. Note that the TCU module needs to be programmed and coded to match the options and your VIN. Remember that the Bluetooth code used to pair your phone with the car is stored in the TCU.

We hope you find the Troubleshoot BMW TCU Telematic Control Unit guide helpful. Check these troubleshooting and repair guides for more help on your BMW.

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