2023 Audi e-tron Ignition Failure DTC U043100 U014100

Symptoms of Ignition Failure

Owners of affected 2023 Audi e-tron models may experience a complete Audi e-tron ignition failure, where the ignition simply "Ignition cannot be switched on." This critical issue prevents the vehicle from starting or operating.

Fault Codes (DTCs)

When the ignition cannot be switched on, diagnostic trouble codes (DTCs) will typically be stored in the Data Bus On Board Diagnostic Interface -J533- (address word 0019). These codes indicate communication problems within the vehicle's electrical system.

Code	Description	Module
U014100	Lost Communication With Body Control Module "A"	Data Bus On Board Diagnostic Interface -J533-
U043100	Invalid Data Received From Body Control Module "A"	Data Bus On Board Diagnostic Interface -J533-

In some cases, after the software update, a secondary DTC C115E54 ("Inertial sensors no basic setting") may appear in the Airbag Control Unit -J234-. This is a known post-update condition and has a specific resolution.

Technical Background

The root cause of this Audi e-tron ignition failure is outdated software within the Comfort System Central Control Module, J393 (diagnostic address 0046). This module is crucial for various vehicle functions, and a software glitch can lead to communication errors that prevent the ignition from activating. Audi has since implemented new software in production to address this condition.

Repair Procedure Summary

To resolve the "Ignition cannot be switched on" condition and clear DTCs U043100 or U014100, technicians will perform a software update on the Comfort System Central Control Module (J393). This procedure is outlined in Technical Service Bulletin 2075237/1 and involves several key steps:

1. Preparation: Before flashing the J393 module, the terminal 30 reset must be performed by pulling the relevant fuses. Technicians must consult the latest wiring diagrams to identify the correct fuse locations.
2. Software Update: The J393 module (diagnostic address 0046) is updated using the Software Version Management (SVM) system, following instructions in TSB 2011732. The specific SVM action code input for this update is 46A034. The new software part number will be 8W1.907.064.EA or higher, with a version of 0630 or higher.
3. Post-Update Reset: After the software update is complete, a bus sleep cycle must be performed. This involves cycling the key off and allowing the vehicle to sit for a few minutes to ensure the module fully resets.
4. Addressing Post-Update DTCs: If DTC C115E54 ("Inertial sensors no basic setting") is stored in the Airbag Control Unit -J234- after the update, technicians must perform basic settings for the inertial sensors. It is not necessary to perform test plans for faults in the Chassis Control with Air Suspension -J774-. Once these basic settings are complete, the C115E54 fault can be deleted.

Important Warnings for Owners and Technicians

• Key Position During Update: The vehicle key must be placed on the emergency reader coil throughout the software update process.
• Module Accessibility: The convenience system central module (J393, diagnostic address 0046) can only be flashed via vehicle self-diagnosis once it is reachable.
• Fuse Reset: Prior to flashing the J393, a terminal 30 reset is required by pulling fuses. Always refer to the latest wiring diagram for correct fuse locations.

Warranty Information

This repair is covered under warranty if the vehicle is within its warranty period. The following codes are used for claim submission:

• Service Number: 5789
• Damage Code: 0039
• Claim Comment: As per TSB 2075237/1

Labor Operations:

Operation	Code	Time Units (TU)	Notes
Software Update	0151 0010	See SRT	With associated operations
Software Update	0151 0060	Time stated	On the diagnostic protocol
Self-diagnosis	0129 0050	See SRT	With associated operations
Repair Convenience system control unit (reset)	5789 4199	10 TU
Check vehicle (bus sleep mode)	0689 0199	10 TU

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Owner Action

If your 2023 Audi e-tron is experiencing an Audi e-tron ignition failure or you suspect related issues, especially if you've seen the "Ignition cannot be switched on" message, it is recommended to contact an authorized Audi service center. Provide them with the details of the problem and mention Technical Service Bulletin 2075237/1. They will be able to diagnose the issue and perform the necessary software update to resolve the communication fault.

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Source: NHTSA ID: 11009368