2022-2024 Audi A3, S3, RS 3 Engine Start System Fault TSB

Audi has released Technical Service Bulletin (TSB) 2069999/3 to address a common starting issue affecting 2022-2024 Audi A3, S3, and RS 3 models. Owners may experience their vehicle not starting and see a specific warning message in the instrument cluster. This TSB, which supersedes Group 97 number 23-99 dated August 25, 2023, provides a solution involving a software update.

The core of the problem, leading to the "Audi S3 engine start system fault", is often a hardware conflict within the onboard supply control unit, known as J519 (address word 0009). This conflict can trigger various diagnostic trouble codes (DTCs) related to the vehicle's electrical system.

Symptoms

Owners of affected 2022-2024 Audi A3, S3, and RS 3 vehicles may encounter the following:

• The vehicle does not start.
• The instrument cluster displays the message "Engine start system: fault".
• The instrument cluster displays the message "Power unit start system: fault".

Fault Codes / DTCs

Technicians investigating the Audi S3 engine start system fault will likely find one or more of the following diagnostic trouble codes (DTCs) stored in various control modules, particularly in the J519 onboard supply control unit:

Diagnostic Address	DTC	Description	Module
J519	B114815	Terminal 15 open circuit/short circuit to B+	Onboard Supply Control
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

Diagnosis / Trigger Conditions

The primary underlying cause for these symptoms and DTCs is identified as a hardware conflict within the J519 onboard supply control unit. This conflict can lead to implausible signals on Terminal 15, which is crucial for vehicle startup and operation.

Repair Procedure Summary

The resolution for the Audi S3 engine start system fault involves updating the software of the J519 onboard supply control unit. The repair process, as outlined in TSB 2069999/3, includes several key steps:

1. Software Update: The primary step is to update the onboard supply control unit -J519- (diagnostic address 0009) using SVM code 09A059. This update requires following all instructions in TSB 2011732: 00 Software Version Management (SVM), operating instructions.
2. DoIP Activation: When flashing a control module via ODIS, DoIP (Diagnostics over Internet Protocol) must be used. Technicians need to activate DoIP by navigating to Administration>>General>>GFF Process>>DoIP communication>>Only allow DoIP communication. This setting will automatically reset after the diagnostic session.
3. Headlight Aiming: After the software update, both headlight assemblies must be aimed to ensure proper functionality.

The TSB specifies that the new software version will be 0183, replacing older versions like 0174-0182 for module software part numbers 5WA937086** and 5WA937087**.

Required Tools or Parts

To perform this repair, technicians will need specific diagnostic equipment:

• VAS 6160/VAS 6150: A VAS tester with the current version of ODIS (Windows 10) is required to carry out the software update and diagnostic procedures.

Important Warnings

Owners should be aware that if their vehicle is outside of any applicable warranty period, this Technical Service Bulletin is informational only. In such cases, the cost of diagnosis and repair may not be covered by Audi.

Owner Action

If your 2022-2024 Audi A3, S3, or RS 3 is experiencing a no-start condition or displaying the "Engine start system: fault" or "Power unit start system: fault" message, it is recommended to schedule an appointment with an authorized Audi service center. Inform them about TSB 2069999/3 and the symptoms you are observing. The repair, involving a software update to the J519 control unit, should resolve the Audi S3 engine start system fault.

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Source: NHTSA ID: 10244603