2022-2026 Audi e-tron GT 12V Battery Discharged TSB 2075846/3

Symptoms of a Discharged 12V Battery

Owners of 2022-2026 Audi e-tron GT and RS e-tron GT models may encounter specific symptoms related to an Audi e-tron GT 12V battery discharged condition. The most common indicators include an "Electrical system warning lamp lights up" message on the instrument cluster. In more severe cases, the vehicle may exhibit a "Vehicle does not start" condition, preventing operation. These symptoms point to an underlying issue with the 12V battery system.

Fault Codes and Diagnostic Trouble Codes (DTCs)

When the 12V battery experiences issues, technicians will likely find a specific diagnostic trouble code (DTC) logged in the Data Bus On Board Diagnostic Interface -J533- (address word 0019). The relevant DTC for this condition is:

• DTC P1D6C00: "12V battery faulty" - Symptom: 8519692 – Active/static OR Passive/sporadic.

This code directly indicates a fault with the 12V battery, which can manifest as an Audi e-tron GT 12V battery discharged state.

Technical Background

Audi has identified that a discharged 12V battery, often accompanied by DTC P1D6C00, can occur in affected e-tron GT and RS e-tron GT vehicles. The primary recommendation for diagnosis is to check the 12V battery itself once this DTC is present. There have been no production changes implemented to address this specific issue, meaning existing vehicles may require this service bulletin's procedure.

Important Warnings for Owners and Technicians

This Technical Service Bulletin 2075846/3 includes several critical warnings to ensure proper repair and prevent further damage:

• High-Voltage Battery Protection: "To prevent charging of the high-voltage battery during the software update, the high-voltage cable is to be removed BEFORE entry of the SVM code on vehicles with high-voltage components. Charging the high-voltage battery during a software update can damage the high-voltage components." This is crucial for technician safety and vehicle integrity.
• Software Update Requirement: The software for the Data Bus On Board Diagnostic Interface -J533- (address word 0019) "must be updated on this vehicle." Failure to do so will not resolve the Audi e-tron GT 12V battery discharged issue.
• Exact SVM Code Entry: "IMPORTANT: For new software update program, the SVM code must be entered exactly, including commas and without spaces (copy and paste the SVM code chain)." Incorrect entry can lead to failed updates.
• Aftermarket Software Modifications: Audi advises informing customers that this software update "may neutralize previous modifications to the vehicle's software performed either by the customer or other third parties." If a customer declines the update, it "could lead to issues or restrictions with the use of the vehicle or individual components."

Repair Procedure Summary

The repair for the Audi e-tron GT 12V battery discharged condition primarily involves a software update and battery maintenance. The procedure varies slightly depending on the model year:

1. Initial Diagnostics and Battery Preparation:

   • Read out all history data from the vehicle's systems.
   • Charge the 12V battery using a charger that provides a charging voltage of 14.8V or higher.
   • It is essential to "Leave the 12V battery charger connected to the vehicle during the flashing procedure."

2. Software Flash using SVM Code:

   • For Model Years 2022 – 2025: Technicians must run SVM code 637A001.
   • For Model Year 2026: Technicians should first perform the steps outlined in TSB 2080608. After that, they will use the "SVM – Authorized Multiple Code Entry" function to flash the SVM Code: BLEGT12VSOC,BLEGTCHECK.

The software update targets the Data Bus On Board Diagnostic Interface -J533- to correctly manage the 12V battery system and prevent future discharge events.

Warranty Information

For vehicles still under warranty, claims should be submitted according to the Audi Warranty Policies and Procedures Manual. However, it's important to note: "If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only." This means that owners of vehicles no longer covered by warranty may be responsible for the cost of diagnosis and repair.

Additional Information for Owners

Audi emphasizes that the software update may involve one or several control units to ensure proper functionality. Customers should be informed about the update and asked if any third-party modifications have been made to the vehicle's software. Such modifications could be affected by the update. If a customer declines the software update, it could lead to ongoing issues or restrictions with the use of the vehicle or its components. It is recommended that this information be documented on the repair order and signed by the customer.

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Source: NHTSA ID: 11031005