2021 Audi Lane Departure Warning C12D7F0 TSB

Audi has released Technical Service Bulletin (TSB) 2062265/2, superseding TSB 21-89 dated February 16, 2021, to address a condition where the lane departure warning (aLDW) system may be sporadically unavailable in certain 2021 Audi models. This issue is often accompanied by a specific diagnostic trouble code and a warning message in the instrument cluster. This TSB provides a solution through a software update.

Symptoms

Owners of affected 2021 Audi vehicles may experience the following:

• The lane departure warning (aLDW) system is sporadically not available.
• When attempting to activate the aLDW system, the instrument cluster displays the message: "Lane departure warning: function requiring license not purchased/expired. See owner's manual."
• The setting to change the activation status of the Emergency Assist system may appear grayed out.

Workshop findings indicate that this issue usually cannot be reproduced easily and occurs only sporadically while driving. Technicians may find a specific Diagnostic Trouble Code (DTC) stored in the driver assistance systems control module, J1121.

Fault Codes / DTCs

When diagnosing this issue, the following DTC may be stored in the J1121 control unit (address word 00A5):

Code	Description	Symptom Code
C12D7F0	Emergency assistant Status feedback for HMI implausible	65551

This DTC C12D7F0 indicates an implausible feedback from the Emergency Assist system to the Human Machine Interface (HMI).

Technical Background

The root cause of the sporadic lane departure warning unavailability and the associated DTC C12D7F0 is an incorrect parameter setting or coding within the driver assistance systems control module, J1121. A software update is required to correct this parameter.

Repair Procedure Summary

The repair involves performing a software update on the driver assistance systems control module, J1121. This update is carried out using the Software Version Management (SVM) system.

1. Technicians must first follow all instructions outlined in TSB 2011732, which details the operating instructions for Software Version Management (SVM).
2. The driver assistance systems control module, J1121 (address word 00A5), is then updated using the SVM action code A5A012. This update will install the new target data container version, resolving the issue with the Audi e-tron lane departure warning C12D7F0.

Required Tools or Parts

The software update utilizes specific Target Data Container Numbers and Versions. Technicians will use the SVM system to apply the correct update based on the vehicle's model. Examples of Target Data Container Numbers and their corresponding versions include:

• Q7/Q8: Old Target Data Container Numbers like 4M1909466B, 4M1909466G, 4M1909466E will be updated to New Target Data Container Version 4M1909466VG (0010) or 4M1909466F (0011).
• A6/A7: Old Target Data Container Numbers like 4K0909466H, 4K0909466T, 4K0909466S will be updated to New Target Data Container Version 4K0909466VT (0047) or 4K0909466AB (0048).
• A8: Old Target Data Container Numbers like 4N0909466L, 4N0909466T will be updated to New Target Data Container Version 4N0909466VT (0055).

Important Warnings

Owners and technicians should be aware that this software update might cause the driver assistance settings of the vehicle to be reset. It is recommended to note down any personalized settings before the update is performed, so they can be reconfigured afterward. Dealers are advised to explain this possibility to customers prior to the update.

Warranty Information

This repair is covered under warranty for up to 48 months or 50,000 miles. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, requiring verification of ownership. If the vehicle is outside of warranty, this Technical Service Bulletin serves as informational guidance only.

• Service Number: 9093
• Damage Code: 0039
• Labor Operations: Software Update (Includes checking for DTCs) - 0151 0000. Time stated on the diagnostic protocol (Maximum 40 TU).
• Diagnostic Time: GFF (No allowance, 0 TU).
• Road test prior to the service procedure: No allowance, 0 TU.
• Road test after the service procedure: No allowance, 0 TU.
• Claim Comment: As per TSB #2062265/2.

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

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Source: NHTSA ID: 10189531