2021-2024 Audi Steering Malfunction DTC B200FF0 C12A329

Symptoms

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

Fault Codes / DTCs

When diagnosing the Audi rear wheel steering malfunction, technicians may find one 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

Technical Background

The root cause of the Audi rear wheel steering malfunction and associated DTCs is identified as outdated software within the rear axle wheel steering control module (J1019). An update to this module's software is required to resolve the issue.

Repair Procedure Summary

To address the Audi rear wheel steering malfunction, technicians will perform a series of steps outlined in Technical Service Bulletin 2066318/4:

1. Software Version Management (SVM) Instructions: The technician must first follow the general instructions provided in TSB 2011732 for SVM operations.
2. Basic Setting (if applicable): If DTC B200FF0 is present with symptom code 251, a basic setting procedure must be performed in the J1019 control unit's self-diagnosis, utilizing service login 20103.
3. Software Update: The J1019 control unit (00CB) will be updated using the SVM action code CBA002. This involves installing new software version 0399 (or higher) to replace old software version 0398, both associated with part number 4N0909145C.
4. Wheel Alignment: After the software update, a wheel alignment must be performed. The recommendation is to adjust the rear axle's negative camber and positive toe (toe-in) to the tolerance limits, and to set the front axle's toe to the center of its tolerance range.

Required Tools or Parts

The primary requirement for this repair is access to the Audi diagnostic system for Software Version Management (SVM) updates. The specific software part number involved is 4N0909145C, with the new version being 0399 (or higher) and the SVM action code CBA002.

Warranty Information

This repair, identified by Service Number 4841 and Damage Code 0040, is covered under Audi's New Vehicle Limited Warranty for up to 48 months or 50,000 miles, whichever comes first. For Audi Certified Pre-Owned (CPO) vehicles, the repair falls under the G10 claim type. If the vehicle is outside of these warranty periods, this Technical Service Bulletin serves as informational guidance only, and the repair cost may not be covered.

Important Revisions

Technical Service Bulletin 2066318/4 supersedes Group 48 number 22-29 dated April 28, 2022. The bulletin has undergone several revisions:

• Revision 4: Added model year information to the header.
• Revision 3 (April 28, 2023): Also revised the header to include additional model year information.
• Revision 2 (March 29, 2022): Updated the Service Version Management (SVM) instructions.

What Owners Should Know

This update differs from a recall. Audi is not notifying consumers directly about this Technical Service Bulletin. Owners experiencing a "Steering malfunction warning in the instrument cluster" or suspecting an Audi rear wheel steering malfunction should contact their authorized Audi dealership to inquire about this service bulletin and schedule an appointment.

NHTSA ID: 10238355