2021-2023 Audi A6, A7, A8 Rear Wheel Steering Malfunction TSB

Symptoms

Owners of affected Audi vehicles may observe a "Steering malfunction warning in the instrument cluster." This warning indicates a potential issue with the rear axle wheel steering system.

Fault Codes / DTCs

Technicians diagnosing the "Audi rear wheel steering malfunction" will likely find one of the following Diagnostic Trouble Codes (DTCs) stored in the rear axle wheel steering control module, identified as J1019 (address word 00CB):

Code	Symptom Code(s)	Description
B200FF0	251 and/or 129	Rear axle wheel steering control module fault
C12A329	224	Rear axle wheel steering control module fault

Diagnosis / Trigger Conditions

The root cause of the "Audi rear wheel steering malfunction" is identified as outdated software within the J1019 rear axle wheel steering control module. The presence of DTC B200FF0 or C12A329 confirms this condition.

Repair Procedure Summary

Audi Technical Service Bulletin (TSB) 2066318/3 outlines a software update procedure to correct the rear wheel steering malfunction. The repair involves updating the software for the J1019 control unit and performing subsequent adjustments.

1. Software Version Management (SVM) Update: Follow the instructions provided in TSB 2011732 for SVM operating procedures. The J1019 (00CB) module must be updated using the SVM action code CBA002.
2. Basic Setting: If DTC B200FF0 with symptom code 251 is present, a basic setting must be performed in the self-diagnosis of the J1019 control unit. This step requires service login 20103.
3. Wheel Alignment: After the software update, a wheel alignment is mandatory. For the rear axle, adjust to the tolerance limits for negative camber and positive toe (toe-in). For the front axle, set the toe to the center of its tolerance range.

Required Tools or Parts

The primary component for this repair is the updated software for the rear axle wheel steering control module. The new software part number is 4N0909145C, with version 0399 (or higher), superseding old software version 0398.

Important Warnings

Owners should be aware that if their vehicle is outside any applicable warranty, this Technical Service Bulletin is informational only, and any repair costs may not be covered by Audi.

Owner Action

If your 2021-2023 Audi A6, A7, or A8 is displaying a "Steering malfunction warning in the instrument cluster" or you suspect an Audi rear wheel steering malfunction, it is recommended to contact an authorized Audi dealership. They can diagnose the issue, confirm the presence of DTC B200FF0 or C12A329, and perform the necessary software update and wheel alignment as per TSB 2066318/3. This repair is typically covered under warranty for eligible vehicles.

This TSB (2066318/3) supersedes Technical Service Bulletin Group 48 number 22-24, dated March 29, 2022.

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Source: NHTSA ID 10210570