2022-2023 Audi S3, A3, RS 3 C10CA00 Limp-Home Mode TSB

Symptoms

Owners of 2022-2023 Audi A3, S3, and RS 3 vehicles may not experience any noticeable symptoms related to this issue. The Diagnostic Trouble Code (DTC) C10CA00 is typically discovered during a routine service visit, rather than due to a customer complaint. When detected, the onboard supply control unit -J519- will store the fault code, indicating a "Limp-home mode" condition.

Even without immediate customer-reported symptoms, a stored DTC C10CA00 and the associated "Limp-home mode" indicate a potential underlying issue that should be addressed. This condition suggests that the vehicle's onboard supply control unit is operating with reduced functionality to protect other systems.

Fault Codes / DTCs

The following Diagnostic Trouble Code (DTC) is associated with this technical service bulletin:

Code	Description	Module
C10CA00	Limp-home mode	Onboard supply control unit -J519- (address word 0009)

Technical Background

Audi Technical Service Bulletin 2071394/1 explains that the presence of DTC C10CA00 in the onboard supply control unit -J519- is due to a software sensitivity. This sensitivity can cause the control unit to incorrectly register a "Limp-home mode" condition, even when the vehicle appears to be functioning normally.

To address this software sensitivity, Audi has developed and implemented optimized software. This updated software aims to prevent the erroneous detection of the "Limp-home mode" and the storage of the C10CA00 fault code.

Repair Procedure Summary

To resolve the DTC C10CA00 and the "Limp-home mode" condition, technicians will perform a software update on the Electronic Central Electrical (BCM), also known as the J519 control unit. This update is carried out using the Software Version Management (SVM) system.

Specifically, the procedure involves updating the J519 module to a newer software version. Depending on the current software version installed in the vehicle, different SVM action codes will be used:

• For vehicles with old software versions 0150 through 0160 (part numbers 5WA 937 086 or 5WA 937 087), the new software version will be 0161, applied using SVM code input 09A057.
• For vehicles with old software versions 0170 and higher (part numbers 5WA 937 086 or 5WA 937 087), the new software version will be 0183, applied using SVM code input 09A059.

Technicians must follow all instructions detailed in TSB 2011732 for SVM operating procedures to ensure the update is performed correctly. This software update directly addresses the software sensitivity causing the Audi S3 C10CA00 limp-home issue.

Required Tools

To perform the software update described in Technical Service Bulletin 2071394/1, specific diagnostic tools are required:

• VAS 6160 / VAS 6150: These are VAS testers that must be equipped with the current version of ODIS (Offboard Diagnostic Information System) running on Windows 10. These tools are essential for communicating with the vehicle's control modules and performing the necessary software flashing.

Important Warnings

Technicians performing this software update must adhere to the following critical instructions:

• DoIP Communication: "Always use DoIP when flashing a control module via ODIS in supported vehicles." DoIP (Diagnostics over Internet Protocol) is crucial for reliable communication during the update process. To activate DoIP, technicians must navigate through the ODIS menu: Administration>>General>>GFF Process>>DoIP communication>>Only allow DoIP communication.
• Temporary Setting: This DoIP setting will automatically reset once the diagnostic session has ended.
• Visual Confirmation: A red LED light will be visible on the VAS 6154(A) diagnostic interface when DoIP is actively engaged.

Warranty Information

This Technical Service Bulletin 2071394/1 outlines the warranty coverage for the software update:

• Standard Warranty: The repair is covered for up to 48 months or 50,000 miles, whichever comes first.
• Certified Pre-Owned (CPO) Vehicles: For CPO vehicles, the claim type is G10, requiring verification of ownership.
• Out-of-Warranty Vehicles: If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only, meaning the repair cost may not be covered.

The service number for this operation is 9710, with a damage code of 0039. The labor operation for the software update, which includes checking for DTCs, is 0151 0000. Diagnostic time is GFF, and no allowance is provided for pre- or post-service road tests.

All warranty claims must comply with the Audi Warranty Policies and Procedures Manual and are subject to review by Audi Warranty.

NHTSA ID: 10242977