2021 Audi A6/A7 Selector Lever Fault U040400 TSB

Symptoms

Owners of affected 2021 Audi A6, A7, S6, RS 6 Avant, A6 allroad, A7 e quattro, S7, and RS 7 vehicles may experience specific issues related to the selector lever. The primary symptom is an intermittent warning message appearing in the instrument cluster. This message directly indicates a problem with the selector lever system.

• The message “Selector lever fault” appears intermittently in the instrument cluster.
• A transmission position cannot be selected via the selector lever, impacting the ability to shift gears.

Fault Codes / DTCs

When these symptoms occur, a specific Diagnostic Trouble Code (DTC) is logged in the vehicle's system. This code helps technicians identify the root cause of the problem.

• DTC U040400: Invalid Data Received From Gear Shift Control Module – Symptom: 27530

This DTC is stored in the Transmission Electronics Control Module -J217-, which is identified by address word 0002. The presence of this code confirms that the module responsible for managing gear shift data is receiving incorrect or invalid information.

Diagnosis

Workshop findings indicate that the complaint can be reproduced intermittently, aligning with customer reports. The core of the problem lies within the vehicle's electronics. The software in the Data Bus On Board Diagnostic Interface -J533- (diagnostic address 0019) requires an update. This module acts as a gateway for communication between various control units in the vehicle.

Repair Procedure Summary

To address the Audi A6 selector lever fault and DTC U040400, a software update is required. This update is part of Audi's Campaign 91DZ. Technicians must refer to the specific instructions detailed in the Campaign 91DZ circular to ensure the correct procedure is followed.

The repair involves updating the software package for the Data Bus On Board Diagnostic Interface -J533- (diagnostic address 0019) to version 0612. This new software package includes updated gateway software designed to resolve the communication issue that triggers the selector lever fault. The process ensures that the Transmission Electronics Control Module -J217- receives valid data, preventing the fault message and restoring proper selector lever functionality.

Important Warnings

Owners should be aware that this Technical Service Bulletin (TSB) is for informational purposes only. It is not applicable to any Audi Warranty. This means that while the TSB provides a solution, the repair may not be covered under standard warranty terms, depending on the vehicle's specific warranty status and the nature of the issue.

Owner Action

If you are experiencing the Audi A6 selector lever fault or the message “Selector lever fault” in your 2021 Audi A6, A7, S6, RS 6 Avant, A6 allroad, A7 e quattro, S7, or RS 7, you should contact your authorized Audi dealership. Inform them about the symptoms and reference Technical Service Bulletin 90 24 22 2074941/1 and Campaign 91DZ. The dealership will be able to check if the necessary software package is available for your vehicle and perform the required update.

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Source: NHTSA ID: 11007335