2021-2024 Audi Steering Malfunction DTC B200FF0 C12A329

Audi has issued Technical Service Bulletin (TSB) 2066318/6 to address a specific issue affecting the rear axle wheel steering system in certain 2021-2024 Audi A6, A7, A8, RS, and S models. This bulletin, which supersedes TSB Group 48 number 23-56 dated October 13, 2023, provides updated procedures for diagnosing and resolving a "Steering malfunction warning" that may appear in the instrument cluster.

This TSB is crucial for owners experiencing an Audi steering malfunction B200FF0 or C12A329, as it outlines the necessary software update to the rear axle wheel steering control module, J1019, to correct the problem.

Symptoms

Owners may notice a "Steering malfunction warning" displayed prominently in the instrument cluster. This warning indicates an issue with the vehicle's rear axle steering system.

Fault Codes / DTCs

When diagnosing the issue, technicians may find one or both of the following Diagnostic Trouble Codes (DTCs) logged in the rear axle wheel steering control module, J1019 (address word 00CB):

Code	Symptom Code	Description
B200FF0	251 and/or 129	Rear wheel steering malfunction
C12A329	224	Rear wheel steering malfunction

These codes confirm a software-related problem within the J1019 control unit.

Diagnosis

The presence of DTC B200FF0 or C12A329 in the J1019 control module, especially when accompanied by the "Steering malfunction warning in the instrument cluster," points to a software deficiency. The technical background provided by Audi indicates that the software for the rear axle wheel steering control module requires an update to resolve the malfunction.

Repair Procedure Summary

The repair involves updating the software of the rear axle wheel steering control module (J1019) and performing a wheel alignment. The procedure, as detailed in TSB 2066318/6, includes several key steps:

1. Software Version Management (SVM) Instructions: Technicians must first follow the instructions outlined in TSB 2011732:00, which covers general SVM operating procedures.
2. Basic Setting (Symptom Code 251): If symptom code 251 is present with DTC B200FF0, a basic setting must be performed in the self-diagnosis of the J1019 control unit using service login 20103.
3. J1019 Software Update: The J1019 control module (00CB) must be updated using the SVM action code CBA002. The old software part number is 4N0909145C with version 0398, which will be updated to version 0399 or higher.
4. Wheel Alignment: After the software update, a wheel alignment is required. This involves adjusting the rear axle for negative camber and positive toe (toe-in) within tolerance limits, and setting the front axle toe to the center of its tolerance range.

Warranty Information

This repair is 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 program, subject to owner verification. If the vehicle is outside of these warranty periods, this Technical Service Bulletin serves as informational guidance.

Owner Action

If you experience a "Steering malfunction warning" in your instrument cluster or suspect an Audi steering malfunction B200FF0 or C12A329, it is recommended to schedule an appointment with an authorized Audi dealership. The dealership will be able to diagnose the issue, confirm the presence of the relevant DTCs, and perform the necessary software update and wheel alignment as per TSB 2066318/6. This is a software-related fix and is typically covered under warranty if your vehicle qualifies.

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Source: NHTSA ID: 11002129