2019-2022 Audi Red Steering Warning Light TSB C10AC07

Audi has issued Technical Service Bulletin (TSB) 2064018/6 to address a condition where 2019-2022 Audi vehicles may display a "red steering warning light" and exhibit heavy steering. This issue is typically linked to a diagnostic trouble code (DTC) C10AC07 stored in the power steering control module. The TSB outlines a software update procedure for the affected control module to resolve the problem.

This bulletin, identified as 48 22 33 2064018/6, was revised on June 16, 2022. It supersedes an earlier Technical Service Bulletin, Group 48 number 22-20, dated January 31, 2022. The revision history indicates updates to the service procedures and notes, with Revision 6 being the latest, updating the service notes. Revision 5, dated January 31, 2022, also revised service notes and added models, while Revision 4, dated December 14, 2021, updated the SVM code and added a note.

Symptoms

Owners of affected 2019-2022 Audi models may observe the following symptoms:

• A "red steering warning lamp lights up in the instrument cluster."
• The steering feels "heavy."

These symptoms suggest a malfunction in the vehicle's power steering system, making the vehicle more difficult to steer.

Fault Codes / DTCs

When diagnosing this issue, technicians will typically find the following diagnostic trouble code stored in the power steering control module, J500 (address word 0044):

Code	Description	Symptom Code
C10AC07	Steering Malfunction	5258760

Diagnosis / Trigger Conditions

The root cause of the "Audi steering warning light C10AC07" and heavy steering is identified as an issue with the software for the power steering control module, J500 (address word 0044). The TSB specifies critical conditions for proceeding with the repair:

• Only proceed with the SVM update if the DTC C10AC07 is present in the J500.
• If there are other DTCs logged in the J500, technicians must first follow GFF/test plans to resolve those additional codes.
• If the steering is heavy but no DTCs are logged, a normal diagnostic procedure should be followed.

Before initiating the software update, technicians must perform a visual inspection of the steering rack and steering boots to ensure they are free of damage and that the steering wheel can move freely. Additionally, the "Control module temperature" value of address word 0044 must be checked and should be greater than 10°C for the software update to proceed successfully.

Repair Procedure Summary

The repair primarily involves updating the software of the power steering control module (J500) using the Audi Software Version Management (SVM) system. The high-level steps are:

1. Initial Inspection: Perform a visual check of the steering rack and steering boots. Verify that the steering wheel can be turned freely without obstruction.
2. Temperature Check: Check the "Control module temperature" value for address word 0044. The temperature must be above 10°C at the time of the software update.
3. SVM Update Instructions: Follow all instructions detailed in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
4. Software Update: Update the power steering control module, J500 (address word 0044), using the SVM action code 44A032. For some specific hardware numbers, the older SVM code 44A030 may be required. It is important to note that the software version number itself will not change after this update.

Warranty Information

This service is covered under warranty for eligible vehicles. The claim type is 110 for vehicles within the 48 months/50,000 miles New Vehicle Limited Warranty. For Audi Certified Pre-Owned (CPO) vehicles, the claim type is G10, and ownership verification is required. The Service Number for this bulletin is 4835, and the Damage Code is 0040.

Labor operations for this procedure include:

• Remove and install noise insulation: Labor operation 1082 1900 (Refer to SRT for associated operations).
• Check steering rack for damage and free movement: Labor operation 4835 0199, allocated 20 Time Units (TU).
• Software Update (Includes checking for DTCs): Labor operation 0151 0000, with time stated on the diagnostic protocol (maximum 50 TU).

Diagnostic time for GFF, and road tests prior to and after the service procedure, are listed as "No allowance" (0 TU). All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual, and claims are subject to audit by Audi Warranty.

Important Warnings

• If the vehicle is outside any warranty, this Technical Service Bulletin is informational only. Owners of out-of-warranty vehicles may be responsible for the cost of diagnosis and repair.
• The software version of the J500 control module will not change after this update, despite the new programming.
• Always check with your Parts Department and/or ETKA for the latest information and parts bulletins, and the Repair Manual for fasteners, bolts, nuts, and screws that require replacement during the repair.

NHTSA ID: 10222851