2022-2024 Audi e-tron GT / RS e-tron GT U112300 Data Bus Error

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, often indicated by the diagnostic trouble code (DTC) U112300 'Data bus error value received', can lead to the vehicle being unable to charge or drive. Audi Technical Service Bulletin (TSB) 2071972/2, also identified as 93 24 78, outlines the necessary steps for diagnosis and repair.

Symptoms

If your 2022-2024 Audi e-tron GT or RS e-tron GT is affected by the Audi e-tron GT U112300 data bus error, you might observe the following:

• An electrical system fault message displayed in the instrument cluster.
• The high-voltage system cannot be activated.
• The vehicle cannot be charged.
• The vehicle cannot be driven.

Fault Codes / DTCs

Technicians may find specific diagnostic trouble codes (DTCs) logged in the vehicle's system memory:

• U112300: 'Data bus error value received' logged in diagnostic address 0019 (gateway -J533-).
• B17D900: 'Safety controller' may also be logged (passive/intermittent) in diagnostic address 008C.

Additionally, the event memory entry U112300 may be associated with one or more of the following internal codes: 16711688, 16711779, 16711740, 16711690. These codes can be active, static, or intermittent.

Diagnosis and Trigger Conditions

The Audi e-tron GT U112300 data bus error occurs when the high-voltage system, managed by the gateway -J533- (0019), is blocked. This blockage is typically caused by the Hybrid Battery Management Control Module, -J840- (008C). Even after an extended bus sleep cycle of 15 minutes, the high-voltage system remains inactive, preventing charging and driving.

Repair Procedure Summary

Audi TSB 2071972/2 outlines two measures based on the vehicle's production date:

Measure 1 (For vehicles produced up to July 14, 2023)

For these vehicles, the repair involves updating the vehicle software. This is done by performing the procedure detailed in TSB 2073768, titled "93 Combined software update Audi e-tron GT". If a specific software update is not yet available for vehicles not covered by TSB 2073768, technicians should proceed with Measure 2.

Measure 2 (For vehicles produced from July 15, 2023, onward, with BMC Software version 1641)

This measure requires a more detailed diagnostic and calibration process:

1. HV Battery Classification Test: Perform a high-voltage battery classification test.
2. Cell Voltage Check: Ensure that the cell voltage measurements of the high-voltage battery do not deviate by more than 10 mV.
3. ODIS Tester Procedure: Using the ODIS diagnostic tester, perform the test program via the following path:
   • Select "Self test".
   • Navigate to "Systems with diagnostic capabilities".
   • Select "008C - hybrid battery management J840".
   • Select "008C - hybrid battery energy management – functions".
   • Finally, select "008C - reset cell voltages".
4. Login Code: A login code will be required to perform the "Reset cell voltages" function. This code can be obtained by opening a TAC web ticket, using TSB 2071972/2 as the TSB number and "Reset cell voltages" as the subject.
5. DTC Clearing and System Activation: After successfully performing the routine, it should be possible to clear the DTC entries in the gateway (address word 0019) and reactivate the high-voltage system.

Important Warnings

Owners should be aware that if their vehicle is outside of any warranty coverage, this Technical Service Bulletin 2071972/2 is provided for informational purposes only. Repair costs may not be covered by Audi in such cases.

Warranty Information

Warranty claims for this issue are typically covered for up to 48 months or 50,000 miles, whichever comes first. For Certified Pre-Owned (CPO) vehicles, G10 coverage applies, subject to owner verification. The service number for this bulletin is 9325, with a damage code of 0039. Diagnostic times for software updates and high-voltage battery checks are specified, as are road test allowances before and after the service procedure. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

NHTSA ID: 11005958