2021 Audi MIB3 Navigation Malfunction DTC B126CF0

Symptoms

Owners of affected 2021 Audi vehicles equipped with MIB3 navigation systems may observe symptoms related to the Audi MIB3 navigation fault B126CF0. These issues typically occur after an over-the-air navigation map update. Common customer complaints include:

• "The navigation system is permanently initializing."
• "The navigation map is corrupt or incomplete."

Fault Codes / DTCs

When diagnosing the navigation system malfunction, technicians may find the following Diagnostic Trouble Code (DTC) stored in the information electronics control module (J794, address word 005F):

Code	Description	Module
B126CF0	Navigation system Navigation database malfunctioning	Information electronics control module (J794)

Technical Background

Audi has identified that an internal reset occurring during an over-the-air navigation map update can lead to corruption of the navigation database. This corruption prevents the MIB3 system from properly loading or initializing the navigation functions, resulting in the observed symptoms and the storage of DTC B126CF0.

Repair Procedure Summary

Addressing the Audi MIB3 navigation fault B126CF0 requires a specific procedure to refresh the navigation database. This process involves preparing a USB drive with the latest navigation data and performing a software update through the vehicle's MMI system and ODIS diagnostic tool. The general steps are:

1. Obtain a download link for the current MIB3 navigation database from the Technical Assistance Center (TAC).
2. Download the necessary files to a PC's C drive, ensuring both files from the download link are saved.
3. Prepare a 32GB USB drive by formatting it to FAT32. This step is crucial, as other formats will not work.
4. Extract the downloaded navigation files using 7-zip and copy them directly to the root of the formatted USB drive. The files must not be placed within a folder on the USB drive.
5. Safely eject the USB drive from the computer.
6. Using the ODIS diagnostic system, navigate to the information electronics control module (005F) and access the basic settings.
7. Select "Formatting partitions of internal memory" and then choose "Navigation data bank" under parameters. Run the basic setting to format the internal memory.
8. Insert the prepared USB drive into the vehicle.
9. Access the MMI settings in the vehicle, then go to "system maintenance" and select "software update." The update should now be available for installation.

Required Tools or Parts

To perform the navigation database update, a specific tool is required:

• USB Flash Drive: A 32GB or larger USB flash drive, locally sourced, formatted to FAT32.

Important Warnings

Audi provides the following important notes for technicians and owners regarding this service procedure:

• "Please keep the USB flash drive with the navigation data as a workshop tool."
• "It is not required to call into TAC or re-download the navigation data if the USB flash drive has already been created and is available."
• "It is not required to keep the vehicle in a service bay or to supervise the update after it has been started."

Warranty Information

This Technical Service Bulletin outlines specific warranty claim types and codes for addressing the navigation system malfunction:

• Claim Type: 110 (up to 48 Months/50,000 Miles) or G10 (for CPO Covered Vehicles – Verify Owner).
• Service Number: 9196
• Damage Code: 0039
• Labor Operations:
  • Reinstall the Navigation Database: 9196 9999 (20 Time Units)
  • Diagnostic Time: GFF 0150 0000 (Maximum 15 Time Units)
  • Road test prior to the service procedure: No allowance (0 Time Units)
  • Road test after the service procedure: No allowance (0 Time Units)

Warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty. If the vehicle is outside of warranty coverage, this Technical Service Bulletin serves as informational guidance.

Additional Information

This bulletin (91 21 82 2062115/3, dated March 15, 2021) supersedes Technical Service Bulletin Group 91 number 21-69 dated February 17, 2021. It also references TSB 2037809, "91 MIB: MMI navigation map update 'How-to guide' - potential customer concerns," for further details.

NHTSA ID: 10189150