2022-2025 Audi e-tron GT 12V Battery Discharged TSB

Symptoms of a Discharged 12V Battery

Owners of 2022-2025 Audi e-tron GT models might notice several issues related to a discharged 12V battery. The most common complaints include the "electrical system fault lamp lights up" on the dashboard, or the vehicle simply "does not start." These are critical indicators that the 12V battery is not functioning correctly.

Beyond these primary indicators, a discharged 12V battery can manifest through various electrical system malfunctions. Owners may report issues with battery management functionality, or problems with indicator, information, malfunction, or warning display symbols. General functionality problems within the instrument cluster, displays, and screens are also common. Technicians investigating these complaints may observe specific conditions such as the starter battery exhibiting "electrical -> voltage too low," or even physical damage to either the starter battery or the auxiliary battery, described as "component, automotive fluids damaged."

Diagnostic Trouble Code (DTC) P1D6C00

When a 12V battery discharge issue occurs in an Audi e-tron GT, the Data Bus On Board Diagnostic Interface -J533- (address word 0019) will typically log Diagnostic Trouble Code (DTC) P1D6C00. This code specifically indicates a "12V battery faulty" condition. The fault can be recorded in the system as either static (constantly present) or intermittent (occurring sporadically), and it is associated with symptom code 8519692.

Understanding the Diagnosis

Diagnosis for the Audi e-tron GT 12V battery discharged issue begins with verifying the customer's complaint and checking for the presence of DTC P1D6C00. The technical background for this TSB emphasizes the importance of checking the 12V battery whenever this DTC is logged. It's important to note that there is no production change related to this issue, meaning the problem is addressed through specific service procedures rather than a manufacturing update.

Revision History

Technical Service Bulletin 2075846/2 has undergone revisions to ensure comprehensive guidance:

• Revision 1 (October 31, 2024): This was the initial publication of the bulletin.
• Revision 2: This revision included a revised header, specifically adding Model Year 2025 to the scope. It also revised the service section, adding new directions and changing verbiage to clarify the repair procedure.

Repair Procedure Summary

To address the Audi e-tron GT 12V battery discharged condition, technicians are instructed to follow a precise, multi-step procedure:

1. Run Test Plan and Read History Data: The initial step requires running the vehicle's test plan to thoroughly read out all available history data. This comprehensive data collection is crucial for understanding the fault's context, frequency, and potential contributing factors.
2. Charge the 12V Battery: The vehicle's 12V battery must be charged using a charger capable of providing a charging voltage of 14.8V or higher. Proper charging ensures the battery is brought to an optimal state before further evaluation and diagnostic steps.
3. Delete DTC Memory Entry: After the battery has been charged, the Diagnostic Trouble Code (DTC) P1D6C00 entry is to be deleted from the vehicle's fault memory. This clears the existing fault, allowing for a fresh assessment of the battery's condition.
4. Re-evaluate Battery using GFF: The battery is then re-evaluated using the Guided Fault Finding (GFF) system. This system provides a structured diagnostic process to confirm the battery's health and determine the effectiveness of the charging procedure.
5. Run Associated Test Plan (if needed): If the DTC P1D6C00 is still logged in the system after the charging and initial re-evaluation steps, technicians are instructed to run the associated test plan specifically for that DTC entry within the Guided Fault Finding system. This ensures a comprehensive and targeted diagnosis of any persistent issues, guiding the technician to the root cause.

Important Warning for Owners and Technicians

Audi explicitly states a critical warning regarding this issue: "Replacing the battery without an instruction to do so from Guided Fault Finding is not permitted." This means that technicians should not replace the 12V battery as a first resort or without strictly adhering to the prescribed diagnostic steps. Premature or unauthorized battery replacement will not resolve the underlying issue if the Guided Fault Finding system does not specifically recommend it, potentially leading to unnecessary costs and unresolved problems.

Warranty Information

For warranty claims related to this TSB (Transaction No. 2075846/2), the claim type is generally informational only if the vehicle is outside of its warranty period. The service number associated with this bulletin is 2706, and the damage code is 0040. Labor operations for Guided Fault Finding (GFF) are specified as:

• 0150 0010: For GFF / Guided Functions, with instructions to "See SRT with associated operations."
• 0150 0060: Also for GFF / Guided Functions, with the time stated on the diagnostic protocol.

All warranty claims submitted for payment must strictly adhere to the guidelines outlined in the Audi Warranty Policies and Procedures Manual. Claims are subject to review and audit by Audi Warranty to ensure compliance.

Source Citation

NHTSA ID: 11020338