2022-2024 Audi e-tron GT U112300 Electrical Fault TSB

Owners of 2022-2024 Audi e-tron GT and RS e-tron GT vehicles may encounter an electrical system fault that prevents the high-voltage system from activating. This issue means the vehicle cannot be charged or driven. Audi Technical Service Bulletin (TSB) 2071972/1, issued on January 12, 2024, provides a diagnostic and repair procedure for this specific condition, which is frequently associated with a U112300 fault code.

Symptoms

If your Audi e-tron GT is affected by this issue, you may observe the following:

• An electrical system fault message displayed in the instrument cluster.
• The high-voltage system cannot be activated, rendering the vehicle inoperable.
• The vehicle cannot be charged or driven, even after an extended bus sleep cycle of 15 minutes.

These symptoms point to a potential Audi e-tron GT U112300 fault related to data bus communication or battery management.

Fault Codes / DTCs

Technicians may find one or more of the following Diagnostic Trouble Codes (DTCs) stored in the vehicle's control modules:

Diagnosis / Trigger Conditions

This TSB applies if the customer's reported symptoms can be reproduced and if, after initial Guided Fault Finding (GFF) and addressing all logged DTCs, the complaint persists. The primary condition for this TSB is the inability to activate the high-voltage system due to a block in the Gateway Control Module J533, originating from the Hybrid Battery Management Control Module J840.

Repair Procedure Summary

To resolve the Audi e-tron GT U112300 fault, technicians will follow a specific procedure outlined in TSB 2071972/1:

1. Initial Diagnostics: All existing DTC entries must first be addressed using Guided Fault Finding (GFF).
2. Software Check: The software version of the Hybrid Battery Management Control Module J840 will be checked. If the software is lower than version 1641, a different TSB (2065473) may need to be performed first, which addresses DTCs such as P0AA1, P0AA2, P0AA4, P0AA5, P0AE2, P0AE3, P1609, P168A, P1A01, P1A37, P1D5F, and P1D65.
3. Battery Classification: A classification of the high-voltage battery will be performed to ensure its health.
4. Cell Voltage Verification: It is crucial to confirm that the cell voltage measurements of the high-voltage battery do not deviate by more than 10 mV.
5. ODIS Tester Procedure: Using the ODIS tester, the technician will navigate to the self-test function and select:
   • Diagnostic capable system
   • 008C - Hybrid Battery Energy Management - J840
   • 008C - Hybrid Battery Energy Management - functions
   • 008C - Reset cell voltages
6. Login Code Acquisition: A login code for the