2023-2024 Audi Engine Start System Warning TSB

Owners of 2023-2024 Audi vehicles may encounter an Audi e-tron engine start system warning message displayed in the instrument cluster. This Technical Service Bulletin (TSB) 2071735/5, issued by Audi, addresses these specific warnings and provides a solution to prevent them from appearing.

This bulletin, identified as 2071735/5, is a revision 5 document dated May 14, 2024, and supersedes previous versions, including Technical Service Bulletin Group 57 number 24-38 dated April 16, 2024. It clarifies the diagnostic and repair procedure for the affected vehicles.

Symptoms

Vehicle owners may observe one of the following messages in their instrument cluster:

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

Audi notes that despite these warnings, there are no actual functional issues with the vehicle's engine start or power unit systems. The warnings are primarily informational due to a software anomaly.

Fault Codes / DTCs

When diagnosing the Audi e-tron engine start system warning, technicians will find a specific Diagnostic Trouble Code (DTC) stored in the Comfort Control Module, -J393- (address word 0046). The relevant DTC is:

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

Technical Background

The root cause of the "Engine start system: fault" or "Power unit start system: fault" messages and the associated DTC B200047 is a software issue within the Comfort Control Module -J393-. This module is responsible for various comfort and convenience functions, and the software glitch leads to the erroneous warning display.

Repair Procedure Summary

The repair involves updating the software of the Comfort Control Module -J393-. This process is performed using the Software Version Management (SVM) system. Technicians must follow the instructions detailed in TSB 2011732: 00 Software Version Management (SVM), operating instructions, to ensure a correct and complete update.

The update procedure involves using the SVM action code 46A034. The software versions for the Comfort Control Module -J393- will be updated as follows:

Model(s)	Old Software Part Number	Old Software Version	New Software Part Number	New Software Version
A4, A5, Q7, Q8, and Q8 e-tron	8W1.907.064.*	0627	8W1.907.064.*	0630
e-tron GT	992.907.064.*	0627	992.907.064.*	0630

This software update will resolve the underlying issue causing the Audi e-tron engine start system warning and clear the DTC B200047.

Important Warnings

During the software update process, it is critical that the key must be on the emergency reader coil to ensure uninterrupted communication and successful completion of the update. Failure to do so could lead to complications or an incomplete update.

Warranty Information

This repair is covered under Audi's warranty program. For eligible vehicles, the claim type is 110, applicable for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, the claim type is G10, requiring verification of owner eligibility. If the vehicle is outside of any warranty coverage, this Technical Service Bulletin is for informational purposes only, and the repair cost may not be covered.

Owner Action

If your 2023-2024 Audi vehicle displays an "Engine start system: fault" or "Power unit start system: fault" message, you should contact your authorized Audi dealership. Inform them about the warning message and mention Technical Service Bulletin 2071735/5. The dealership will be able to perform the necessary software update to the Comfort Control Module -J393- to resolve the issue.

NHTSA ID: 11002233