In this guide, we take a look at how to read fault codes from BMW telematic control unit (TCU) module using an OBD-II diagnostic scanner.
BMW TCU module is located in the trunk area but fault codes stored in the TCU can be read via the OBD-II port under the dashboard. 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 with each other via the antenna connected to the TCU.
TCU stands for Telematics Control Unit. When your BMW TCU module fails you may notice the SOS malfunction message on iDrive screen.
If you are experiencing problems a good starting point is to read fault codes from the TCU module.
If any code is showing PRESENT status the problem needs to be fixed before the code can be cleared.
These are general instructions and may vary depending on the diagnostic scanner model that you use to troubleshoot BMW vehicles.
When purchasing a BMW scanner, verify that it supports your BMW model and year. Full system scanners that are known to work on BMW vehicles can range in price from $150 to $800 USD. Learn more about popular BMW scanners here.
You can buy BMW TCU from your dealer or purchase a BMW TCU Module online. Note that TCU module needs to be programmed and coded to match the options and your VIN number. Keep in mind that the Bluetooth code used to pair your phone with the car is stored in the TCU.