2021 Audi A6/A7 Selector Lever Fault U040400 TSB

Symptoms

Owners of affected 2021 Audi A6, A7, S6, S7, RS 6 Avant, RS 7, and A6 allroad models may observe an intermittent warning message in the instrument cluster. The primary symptom is the appearance of the message "Selector lever fault". This warning is often accompanied by an inability to select a transmission position using the selector lever, indicating a problem with the vehicle's gear selection system.

Fault Codes / DTCs

When diagnosing the "Selector lever fault" condition, technicians will typically find a specific Diagnostic Trouble Code (DTC) logged in the Transmission Electronics Control Module -J217- (address word 0002). The relevant fault code is:

This DTC U040400 indicates that the Transmission Electronics Control Module -J217- is receiving invalid data from the Gear Shift Control Module, leading to the reported issues.

Diagnosis / Trigger Conditions

The complaint of an intermittent "Selector lever fault" and inability to select gears can be reproduced intermittently. Workshop findings confirm that the DTC U040400 is logged in the Transmission Electronics Control Module -J217-. The root cause identified is related to the software within the Data Bus On Board Diagnostic Interface -J533- (diagnostic address 0019). This module requires an update to resolve the communication issue that triggers the DTC U040400.

Repair Procedure Summary

To address the 2021 Audi A6 selector lever fault U040400, a software update is required for the Data Bus On Board Diagnostic Interface -J533- (diagnostic address 0019). This update involves installing software version 0612. The repair process is managed through Campaign 91DZ. Technicians must refer to Campaign 91DZ to check for the availability of the specific software package for the vehicle. If the software is available, the update procedure should be performed as described in the Campaign Circular for the vehicle, which is specified within the 91DZ documentation. This required software package includes new gateway software specifically designed to resolve the communication complaint causing the intermittent "Selector lever fault".

Important Warnings

This Technical Service Bulletin (TSB) 90 24 22 2074941/1 is provided for informational purposes only. It is not applicable to any Audi Warranty. Owners should be aware that this repair is not covered under standard Audi warranty terms. All part and service references provided in this TSB (2074941) are subject to change and/or removal, so it is always advisable to check with an authorized Audi Parts Department for the latest information.

Owner Action

If your 2021 Audi A6, A7, or related model is displaying the "Selector lever fault" message or you are experiencing difficulty selecting transmission gears, it is recommended to contact your authorized Audi dealership. Inform them about the symptoms and mention Technical Service Bulletin 90 24 22 2074941/1 and Campaign 91DZ. The dealership will be able to check if the required software update is available for your specific vehicle and perform the necessary repair to resolve the Audi A6 selector lever fault U040400.

Source: NHTSA ID 11007254