2022-2024 Audi A3, S3, RS 3 "Engine/Power Unit Start System: Fault" TSB

Owners of 2022-2024 Audi A3, S3, and RS 3 models may encounter a frustrating issue where their vehicle fails to start, accompanied by a specific warning message in the instrument cluster. This problem is addressed by Audi Technical Service Bulletin (TSB) 97 23 99 2069999/2, which supersedes TSB Group 97 number 23-93 dated April 17, 2023.

This TSB outlines a software-based solution for a hardware conflict within the onboard supply control unit, J519, which is critical for vehicle starting functions. If you experience an Audi S3 Engine/power unit start system fault, this bulletin provides the necessary information for diagnosis and repair.

Symptoms

If your 2022-2024 Audi A3, S3, or RS 3 exhibits a no-start condition, you will likely see one of the following warning messages displayed in the instrument cluster:

• "Engine start system: fault"
• "Power unit start system: fault"

Fault Codes / DTCs

When diagnosing this issue, technicians will typically find Diagnostic Trouble Code (DTC) B114815 stored either statically or intermittently in the onboard supply control unit, J519 (address word 0009). Additionally, various related Terminal 15 implausible DTCs may be stored in other modules. The following codes are commonly associated with this problem:

Diagnostic Address	DTC	Description
0003	U140500	Terminal 15, implausible signal
0015	B201C00	Supply voltage implausible signal
0023	C121E00	Terminal 15, implausible signal
0044	U112300	Data bus error value received
0069	U140500	Terminal 15, implausible signal
0075	U112300	Data bus error value received
J519 (0009)	B114815	Terminal 15 open circuit/short circuit to B+

Diagnosis

The root cause of the Audi S3 Engine/power unit start system fault and related DTCs is identified as a hardware conflict within the J519 onboard supply control unit. This conflict disrupts the proper functioning of Terminal 15, which is essential for ignition and power supply to various systems upon vehicle startup.

Repair Procedure Summary

The resolution for this issue involves updating the software of the onboard supply control unit J519. This is performed using SVM (Software Version Management) code 09A059. The update process requires the use of DoIP (Diagnostic over Internet Protocol) communication.

Technicians must follow these general steps:

1. Activate DoIP: In the diagnostic system, navigate to Administration>>General>>GFF Process>>DoIP communication>>Only allow DoIP communication. This setting will reset after the diagnostic session concludes. DoIP is active when a red LED is observed on the VAS 6154(A) diagnostic tool.
2. Refer to SVM Operating Instructions: Follow all instructions detailed in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
3. Update J519 Control Unit: Update the onboard supply control unit J519 (diagnostic address 0009) using the SVM action code 09A059. The TSB specifies software part numbers 5WA937086** and 5WA937087**, with old software versions ranging from 0174 to 0182, and a new target software version of 0183.

Required Tools

To perform the software update, technicians will need the following equipment:

• VAS 6160/VAS 6150: A VAS tester equipped with the current version of ODIS (Offboard Diagnostic Information System) running on Windows 10.

Warranty Information

This repair is covered under warranty for eligible vehicles. The claim types include:

• Type 110: For vehicles up to 48 months or 50,000 miles.
• Type G10: For CPO (Certified Pre-Owned) covered vehicles, requiring owner verification.

If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only. The service number for this procedure is 9710, with a damage code of 0039. Labor operations for the software update in the J519 control unit are timed according to the diagnostic protocol, with a maximum of 100 Technical Units (TU).

Important Warnings

• Out-of-Warranty Vehicles: If your vehicle is no longer under warranty, this TSB is for informational purposes only. The repair may not be covered by Audi.
• Parts Replacement: The updated TSB revision (2069999/2) specifically removes part replacement, indicating that the issue is resolved purely through a software update.

Owner Action

If your 2022-2024 Audi A3, S3, or RS 3 is experiencing a no-start condition with the "Engine start system: fault" or "Power unit start system: fault" message, you should contact an authorized Audi dealership. Inform them about the symptoms and the warning messages you've observed. Reference TSB 97 23 99 2069999/2 to ensure they are aware of the specific software update required to resolve this Audi S3 Engine/power unit start system fault.