2023-2024 Audi Engine Start System Warning TSB

Symptoms

Owners of certain 2023-2024 Audi models may observe a warning message in their instrument cluster stating either "Engine start system: fault" or "Power unit start system: fault". Despite these messages, the vehicle typically experiences no functional issues related to the engine or power unit. This Audi engine start system warning is primarily a display error caused by a software anomaly.

Fault Codes / DTCs

When these warning messages appear, a specific diagnostic trouble code (DTC) is stored in the Comfort Control Module, identified as -J393- (address word 0046). The relevant fault code and symptom combination is:

• DTC B200047: Control Module Faulty, active/static – Symptom 65552

This DTC points directly to a software-related problem within the control module rather than a hardware failure.

Diagnosis and Trigger Conditions

The root cause of the "Engine start system: fault" or "Power unit start system: fault" messages is a known software issue within the Comfort Control Module -J393-. This module is responsible for various comfort and convenience functions, and a glitch in its programming leads to the erroneous display of the Audi engine start system warning. The issue is purely software-based, meaning no physical component is malfunctioning.

Important Warnings

During the software update procedure, it is crucial to ensure the vehicle's key is placed on the emergency reader coil. This step is vital for the successful completion of the update and to prevent potential interruptions or errors.

Repair Procedure Summary

To resolve the Audi engine start system warning and clear DTC B200047, a software update for the Comfort Control Module -J393- is required. This procedure is detailed in Audi Technical Service Bulletin 2071735/5, which supersedes previous bulletin Group 57 number 24-38 dated April 16, 2024.

The update process involves using the Software Version Management (SVM) system. Technicians must follow the instructions outlined in TSB 2011732, which covers SVM operating procedures. The specific SVM action code for this update is 46A034.

The update targets the Comfort Control Module -J393- (diagnostic address 0046). Depending on the vehicle model, the software part numbers will be updated from an older version (e.g., 8W1.907.064.* or 992.907.064., version 0627) to a newer version (e.g., 8W1.907.064. or 992.907.064.*, version 0630 or higher). This ensures the latest software fixes are applied to the module, eliminating the erroneous warning messages.

Warranty Information

For eligible vehicles, this software update is covered under warranty. The claim type is "110 up to 48 Months/50,000 Miles." For Audi Certified Pre-Owned (CPO) vehicles, the claim type is "G10 for CPO Covered Vehicles," requiring verification of ownership. If the vehicle is outside of any warranty coverage, this Technical Service Bulletin serves as informational guidance, and the cost of the update may be borne by the owner.

Owner Action

If your 2023-2024 Audi vehicle displays an "Engine start system: fault" or "Power unit start system: fault" message, even without any noticeable functional issues, it is recommended to contact your authorized Audi dealership. Inform them about the specific warning message and mention Technical Service Bulletin 2071735/5. The dealership will be able to diagnose the issue, confirm the presence of DTC B200047, and perform the necessary software update on the Comfort Control Module -J393-.

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Source: NHTSA ID 11002133