2023-2024 Audi e-tron Start System Warning TSB

Owners of 2023-2024 Audi e-tron models may encounter an "Engine start system: fault" or "Power unit start system: fault" message displayed in their instrument cluster. This issue, while not causing any functional problems with the vehicle's operation, is a known software glitch that Audi is addressing through Technical Service Bulletin (TSB) 2071735/3.

This TSB, identified as 57 24 33 2071735/3, supersedes a previous bulletin, 23-20, dated October 25, 2023. It provides a clear solution for the Audi e-tron start system warning by updating the software in the affected control module.

Symptoms

The primary symptom owners will notice is one of two specific messages appearing in the instrument cluster:

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

Despite these warnings, the vehicle's starting and operational functions remain unaffected. The Audi e-tron start system warning is purely an informational display error caused by a software anomaly.

Fault Codes / DTCs

When scanned, the Comfort Control Module (-J393-), located at address word 0046, will store the following Diagnostic Trouble Code (DTC):

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

This specific DTC confirms the software-related nature of the Audi e-tron start system warning.

Technical Background

The root cause of the "Engine start system: fault" and "Power unit start system: fault" messages is a software issue within the Comfort Control Module, designated as -J393-. This module is responsible for various comfort and convenience features, and a bug in its programming leads to the erroneous warning display.

Repair Procedure Summary

The repair involves updating the software of the Comfort Control Module (-J393-). This procedure is performed using Audi's Software Version Management (SVM) system. Technicians must follow the instructions outlined in TSB 2011732, which details the general operating procedures for SVM updates.

Specifically, the Comfort Control Module will be updated using SVM action code 46A034. The update will transition the software from an older version, 0627 (part number 8W1.907.064.), to a newer version, 0628 (part number 8W1.907.064. or higher). This software revision corrects the internal logic that triggers the incorrect Audi e-tron start system warning.

Important Warnings

During the software update process, it is crucial that the vehicle's key remains on the emergency reader coil. Failure to do so could interrupt the update and potentially cause further issues with the control module.

Warranty Information

This software update is covered under Audi's warranty policies. For vehicles within the new vehicle limited warranty, the repair is covered up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, and owner verification is required. If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only, and costs may apply.

The service number for this specific repair is 5789, and the associated damage code is 0039. Warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Owner Action

If you are experiencing the "Engine start system: fault" or "Power unit start system: fault" message in your 2023-2024 Audi e-tron, or if your vehicle's diagnostic scan reveals DTC B200047, you should schedule an appointment with an authorized Audi dealership. They will perform the necessary software update to the Comfort Control Module, resolving the Audi e-tron start system warning without affecting vehicle functionality.

NHTSA ID: 10250801