2024-2025 Audi A4/A5 Yellow Steering Warning Lamp TSB

Symptoms

Owners of 2024-2025 Audi A4, A4 allroad, S4, A5, A5 Cabriolet, S5, S5 Cabriolet, RS 5, and RS 5 Sportback models may experience a specific issue upon starting the engine. The primary symptom is the "yellow steering warning lamp lights up" on the dashboard. Concurrently, drivers may notice that the "power steering assistance is reduced", making the steering feel heavier than usual. This condition is linked to a software issue within the steering system.

Fault Codes / DTCs

When diagnosing this issue, technicians may find specific Diagnostic Trouble Codes (DTCs) stored in the steering control unit (diagnostic address 0044, also known as J500). These codes indicate a problem with the steering system's software, specifically with software version SW 0172 and VW-Audi part number 8W0909144N.

Fault Code	Symptom Code	Description
B200000	4176	Steering system fault
B200FF4	16712020	Steering system fault
B200000	4432	Steering system fault

Important Warnings

Audi has issued specific instructions for technicians to ensure correct repair and to prevent confusion during the process. It is crucial to understand that you should "Please ensure that you do not confuse the SVM code with the login code when entering the code!" when performing the software update. Additionally, if the red steering warning lamp illuminates after the update, it is a normal occurrence; simply "Switch the ignition off and on again and then erase all DTCs."

For vehicles with a start/stop system, a factory reset of the steering control unit may be required. Technicians are advised: "Please note that option -2-resets all data from the Power steering control unit-J500. This means that the control module must be re-initiated." This specific reset should only be performed "if you are instructed to do so by a TSB or Technical Assistance Center (TAC)."

Repair Procedure Summary

Audi Technical Service Bulletin 2074847/2, which supersedes TSB 24-69 dated August 9, 2024, provides an updated procedure to address the software issue causing the "Audi A4 A5 yellow steering warning lamp" and reduced power steering assistance. The solution involves an optimized software update for the steering system.

For vehicles without a start/stop system, the procedure is straightforward:

1. Perform a software update of the steering system using SVM code 44A041, followed by SVM code 44B041.
2. After the update, if the red steering warning lamp appears, cycle the ignition and clear all DTCs.

For vehicles with a start/stop system, the process is more involved:

1. Reset the steering control unit (J500 at diagnostic address 0044) to factory settings using Guided Functions.
2. Select option "2" for "Reset to factory settings" within the basic settings for the test program.
3. Use login code 1181 for the program "0044 - Reset all adaptation values / adapt end stops".
4. The diagnostic tester may not automatically confirm the reset; manually click "Done/Continue".
5. Verify that the coding in control unit J500 (address 0044) under Identification is set to "00000000000000". If it is, proceed with the software update. If not, perform the factory reset again.
6. Perform the software update of the steering system using SVM code 44A041, followed by SVM code 44B041.
7. After the update, if the red steering warning lamp appears, cycle the ignition and clear all DTCs.

All instructions in TSB 20117352: 00 Software Version Management (SVM) operating instructions should be followed.

Required Software and Codes

This repair primarily involves software updates and specific codes to access and perform the necessary programming. There are no physical parts to replace for this particular issue.

• Software Version: SW 0172 (old) to SW 1181 (new or higher)
• Part Numbers: 8W0909144N (old software), 8W0909144P (new software)
• SVM Codes for Update: 44A041, 44B041
• Login Code for Factory Reset: 1181

Warranty Information

This service bulletin outlines the warranty claim procedures for this repair. The claim type is informational if the vehicle is outside of its warranty period. The service number for this procedure is 4835, and the damage code is 0040. Labor operations for the software update include codes 0151 0010 and 0151 0060. Road tests before and after the service procedure are listed as