2021-2022 Audi e-tron Battery Gauge Display TSB

This Technical Service Bulletin (TSB) 93 21 56 2059467/2, issued on October 21, 2021, provides important information regarding the high-voltage battery gauge display in the instrument cluster of certain Audi e-tron models. Specifically, it details the different methods used to visualize battery charge level across the A3 e-tron, Audi e-tron quattro, and Audi e-tron sportback quattro.

This bulletin is purely informational. It supersedes Technical Service Bulletin Group 93 number 20-28, dated May 18, 2020, with updates including the addition of Model Year 2022 and a correction for the Model Year 2016 A3 Model Code.

Technical Background

The Audi e-tron battery gauge display in the instrument cluster can vary significantly depending on the specific e-tron model. This TSB highlights these differences, focusing on how State of Charge (SOC) and State of Health (SOH) are represented to the driver.

• SOC (State of Charge): This indicates the current charge level of the battery, similar to a fuel gauge showing how much gas is left in the tank.
• SOH (State of Health): This refers to the overall capacity or health of the battery, reflecting its ability to hold a charge relative to its original design capacity. A lower SOH means the battery can hold less energy, even if fully charged.

Battery Gauge Display Strategies

The TSB illustrates two primary strategies for the Audi e-tron battery gauge display:

A3 e-tron: Combination of SOC and SOH

For the A3 e-tron (model years 2016-2018), the instrument cluster's battery gauge provides a combined indication of both State of Charge (SOC) and State of Health (SOH). This means the gauge not only shows how much charge is currently available but also gives a visual cue about the battery's overall condition or capacity.

For example, a new battery with 100% SOH and 100% SOC might show a range of 20 miles. If the battery ages to 85% SOH but is still at 100% SOC, the displayed range might decrease to 17 miles, reflecting the reduced overall capacity. The visual representation for the A3 e-tron typically includes a gauge with an 'F' (Full) and 'E' (Empty) marker, where the needle's position indicates the charge level, and potentially other visual elements or segments that subtly convey SOH.

Audi e-tron quattro and Audi e-tron sportback quattro: SOC Only

For the Audi e-tron quattro (model years 2019-2022) and Audi e-tron sportback quattro (model years 2020-2022), the instrument cluster primarily displays only the State of Charge (SOC). This approach is similar to how battery levels are typically shown on laptops or smartphones, focusing solely on the current charge percentage.

In these models, a new battery with 100% SOH and 100% SOC might show a range of 200 miles. An aged battery with 85% SOH but still at 100% SOC would still show a high charge level, but the displayed range would decrease to 170 miles, reflecting the reduced capacity. The gauge for these models often features a numerical percentage or a segmented bar, with a clear indication of the remaining range in miles. The visual design emphasizes the current charge state rather than a combined health indicator.

Important Notes for Owners

This bulletin is explicitly stated as