2021-2022 Audi e-tron 12V Battery Discharge TSB

Owners of 2021-2022 Audi e-tron and e-tron Sportback vehicles may experience a discharged 12V battery, particularly after a high-voltage charging cycle. This condition, addressed by Audi Technical Service Bulletin (TSB) 93 24 88 2074707/1, can lead to significant inconvenience, as the vehicle may not start or even unlock.

Symptoms

If you own a 2021-2022 Audi e-tron, you might notice the following symptoms related to the 12V battery:

• The 12V battery is discharged.
• The vehicle can no longer be started.
• The vehicle's electrical system has no power after a high-voltage charging cycle.
• As a result, the vehicle cannot be unlocked.
• The vehicle cannot be started as a result of the power loss.

Workshop findings confirm that these customer complaints can be reproduced, indicating a consistent underlying problem with the Audi e-tron 12V battery.

Technical Background and Cause

Audi has identified the root cause of this 12V battery discharge as a software issue within the vehicle's systems. This software anomaly incorrectly manages the 12V battery's state of charge, especially after the main high-voltage battery has been charged.

Repair Procedure Summary

The solution for this Audi e-tron 12V battery problem involves a software update. An updated software version is available through Audi's campaign 93N1. This update aims to correct the software logic that leads to the 12V battery discharging unexpectedly.

Important Warnings for Technicians and Owners

Audi provides specific instructions to ensure the correct application of this TSB:

• Technicians must first reproduce the customer complaint to confirm it aligns with the issue described in this TSB. This ensures the repair is correctly assigned.
• The repair, which involves the software update, should only be performed if all specified criteria are met. These criteria include the correct model/type, chassis number, engine/motor and gearbox code, PR number(s), part number, and software version. Applying the solution without meeting all criteria will not resolve the problem and may lead to repeat repairs.
• Audi states that warranty claims may be rejected, and parts redebated if the solution is applied incorrectly.
• It is crucial to process all other open campaigns on the vehicle before applying any other Technical Service Bulletins.

Owner Action

If you are experiencing a discharged Audi e-tron 12V battery after charging, or any of the symptoms listed above, you should contact your authorized Audi dealership. They will be able to diagnose the issue and apply the necessary software update under campaign 93N1. This TSB is informational and generally not applicable to any Audi Warranty for direct reimbursement to owners, but the underlying campaign 93N1 would typically cover the software update.

Source: NHTSA ID: 11005968