2021 Audi All Wheel Drive Malfunction TSB 2048671/5

Owners of 2021 Audi A4, A5, A6, A7, and Q5 models may experience an Audi A6 all wheel drive malfunction indicated by a specific message in the instrument cluster. This condition is typically accompanied by a diagnostic trouble code (DTC) stored in the all-wheel drive control module.

This Technical Service Bulletin (TSB) 39 21 45 2048671/5, released on November 12, 2021, provides instructions for diagnosing and resolving this issue. It supersedes previous TSB Group 39 number 20-26 dated March 17, 2020, with updates to the header, model years, and SVM software procedures.

Symptoms

Owners will typically observe the following symptom:

• An "All Wheel Drive Malfunction Message" displayed in the instrument cluster.

Fault Codes / DTCs

When diagnosing the Audi A6 all wheel drive malfunction, technicians will find a specific diagnostic trouble code (DTC) logged in the all-wheel drive control module, J492 (address word 0022). This DTC indicates a software incompatibility.

Code	Description	Module
U030000	Internal Control Module Software Incompatibility	J492 (All-Wheel Drive Control Module)

Technical Background

The root cause of the "All Wheel Drive Malfunction Message" and DTC U030000 is identified as a Quattro Ultra software error. This incompatibility within the all-wheel drive control module (J492) triggers the warning message and fault code.

Repair Procedure Summary

To resolve the Audi A6 all wheel drive malfunction and clear DTC U030000, technicians will perform a software update on the J492 all-wheel drive control module. The procedure involves several key steps:

1. Software Version Check: The current software version number in the J492 control module is checked using diagnostic tools.
2. SVM Table Comparison: The installed software part number and version are compared against an SVM (Software Version Management) table. If a newer software version is available, an update is required.
3. SVM Update Execution: The software update is performed on the J492 control module using the specified SVM action code, such as 22A007. This process requires following the detailed instructions outlined in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
4. Road Test: After the software update is completed, a road test is performed to confirm the repair and ensure the malfunction message and DTC no longer appear.

Affected Control Module and Software Versions

The all-wheel drive control module, identified as J492 (address word 0022), is the component requiring the software update. Various software part numbers and versions are involved, with updates bringing them to newer revisions. For example, older software versions like 8W9927755 (version 0006) are updated to 8W9927755 (version 0012), and 80A927755C (version 0008) is updated to 80A927755C (version 0024).

Warranty Information

This repair is typically covered under Audi's New Vehicle Limited Warranty for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, coverage falls under the G10 claim type. The Service Number for this bulletin is 3993, and the Damage Code is 0039.

Important Warnings

• If your vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only, meaning the repair costs may not be covered by Audi.

Owner Action

If you experience the "All Wheel Drive Malfunction Message" or suspect an Audi A6 all wheel drive malfunction in your 2021 Audi A4, A5, A6, A7, or Q5, it is recommended to contact an authorized Audi dealership. They can diagnose the issue, confirm the presence of DTC U030000, and perform the necessary software update as per TSB 39 21 45 2048671/5.

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Source: NHTSA ID: 10203591