2021-2022 Audi e-tron Battery Control Unit Software Update

The Issue: Audi e-tron Battery Imbalance

Electric vehicle battery systems are comprised of many individual cells, each with slightly different capacities and voltages. Without proper balancing, the overall battery capacity is limited by the weakest cell. This can lead to individual cells being overloaded and aging prematurely.

Audi has identified that the efficiency of the battery balancing function in some e-tron vehicles may be affected by an error in the cell voltage measurement. This measurement inaccuracy can prevent the battery management system from effectively balancing the cells, potentially impacting the battery's overall performance and lifespan.

The Solution: Software Update 93N6

To address this, Audi has released a software update, identified as 93N6, for the battery modules control unit. This Audi e-tron battery software update is designed to optimize the control unit's function concerning cell balancing and to stabilize the cell voltage measurement. By ensuring more accurate measurements and improved balancing, the update helps maintain the health and performance of the high-voltage battery system.

Repair Procedure Overview

The repair involves updating the software for the battery modules control units. If necessary, other related control units within the vehicle's system may also receive updates. Detailed repair instructions are available to technicians through Audi's ELSA/ServiceNet system.

Audi dealerships are instructed to check their daily campaign open inventory reports or Order Management Data (OMD) for affected vehicles in their inventory. It is mandatory to perform this software update on every affected vehicle before it is delivered to consumers.

Important Information for Owners

Audi has stated that it is NOT notifying consumers about this specific update. Updates like this differ from recalls and service actions, for which consumers typically receive written notifications. Owners of affected vehicles will need to proactively address this with their dealership.

Furthermore, dealer stock vehicles that are affected by this issue cannot be delivered to consumers until the Update is completed. This ensures that all new vehicles are delivered with the latest software improvements.

Parts and Tools

This update is software-only. No parts are needed for this repair, streamlining the service process.

What Owners Should Do

If you own a 2021-2022 Audi e-tron, it is recommended to contact your authorized Audi dealership to inquire about the 93N6 Audi e-tron battery software update. While Audi is not directly notifying owners, this update is important for the long-term health and performance of your vehicle's battery system. You can ask your dealer to check if your vehicle is eligible for this software update during your next service visit.

Source: NHTSA ID 10210581