2022-2023 Audi A3/S3/RS 3 Starting Fault TSB 2069999/1

Symptoms

Owners of 2022-2023 Audi A3, S3, and RS 3 vehicles may experience a no-start condition. When this occurs, one of two specific warning messages will appear in the instrument cluster:

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

This indicates a problem with the vehicle's starting system. If you are experiencing an Audi S3 engine start system fault, it's important to have your vehicle diagnosed.

Fault Codes / DTCs

When the "Engine start system: fault" or "Power unit start system: fault" message appears, the following Diagnostic Trouble Code (DTC) is typically stored in the onboard supply control unit, J519 (address word 0009):

• B114815: Terminal 15 open circuit/short circuit to B+

Additionally, various other Terminal 15-related implausible DTCs may be stored in different modules. These include:

Diagnostic Address	DTC	Description	Module
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 root cause of the Audi S3 engine start system fault and the associated DTCs is identified as a hardware conflict within the onboard supply control unit, J519. This conflict leads to the incorrect reporting of Terminal 15 status, which is crucial for vehicle operation and starting.

Repair Procedure Summary

To resolve the "Engine start system: fault" condition and clear the associated DTCs, the recommended repair is to replace the onboard supply control unit, J519 (diagnostic address 0009). This procedure directly addresses the hardware conflict causing the issue. Technicians should reference Technical Service Bulletin 2069999/1 when submitting claims for this repair.

Required Tools

For proper diagnosis and repair, technicians will need specific tools:

• VAS 6160 / VAS 6150: A VAS tester equipped with the current version of ODIS (Windows 10).

Important Warnings

Owners should be aware of the warranty implications for this service. If your vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only, meaning the repair costs may not be covered.

Warranty Information

This repair is generally covered under warranty for qualifying vehicles. The claim types and details are as follows:

• Claim Type: 110 (Up to 48 Months/50,000 Miles) or G10 (for CPO Covered Vehicles – verify owner).
• Service Number: 9710
• Damage Code: 0040
• Labor Operations: Remove and install onboard supply control unit (code 9710 19xx). Refer to the Service Repair Time (SRT) for associated operations.
• Diagnostic Time: GFF (0150 0000), based on the diagnostic protocol (maximum 100 TU).
• Road Test: No allowance for road tests performed before or after the service procedure (0 TU).

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit.

Owner Action

If your 2022-2023 Audi A3, S3, or RS 3 displays the "Engine start system: fault" or "Power unit start system: fault" message, or if you suspect an Audi S3 engine start system fault, it is recommended to contact an authorized Audi service center. They will be able to diagnose the issue, confirm the presence of DTC B114815 or related codes, and perform the necessary replacement of the J519 control unit.

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Source: NHTSA ID: 10235530