2021-2023 Audi MIB3 A/C Settings Not Saving TSB

Audi has issued Technical Service Bulletin (TSB) 2079618/1 to address a specific concern affecting the MIB3 infotainment system in various 2021-2023 models. The core problem identified is that "customizations to the air conditioning function bar in the lower display not being saved." This means that personalized A/C settings are not retained, leading to a frustrating user experience. The 2021 Audi e-tron MIB3 A/C settings not saving issue is a common complaint among affected owners.

Symptoms of Unsaved A/C Settings

Owners of affected Audi vehicles may notice that any shortcuts they program into the air conditioning operating unit, such as "Steering wheel heating" or "REAR" defrost, revert to default settings. After the vehicle completes a bus sleep cycle (typically when the car has been off for a period), these shortcuts are reset to their original status, usually "A/C MAX" and "OFF." The complaint types associated with this issue include "functionality -> no function," "functionality -> misfire," and "functionality -> operation sequence incorrect."

Technical Background and Affected Components

Audi's investigation reveals that the root cause of this problem is a "Software issue in control unit 1 for information electronics (005F)." This specifically impacts vehicles equipped with MIB3 Pr 35/37 and MIB3 Pr 33 systems. The "Information electronics 1" control unit, identified by diagnostic address 005F, is the primary component where the software anomaly resides. Various existing software versions, such as "38**," "36**," "35**," "37**," and "33**," have been identified in affected units. The long-term production solution involves updating this control unit to a software version greater than 4000.

Relevant PR Numbers

The following PR (Production Release) numbers are associated with the affected systems and configurations:

• ?:with B30
• ?:or?:with ER3 ?:and?: without B39?:and?:without I8W?:and?:without I8Y
• ?:or?:with ER1 ?:and?:without I8W?:and?:without I8Y
• ?:or?:with B24
• ?:or?:with ER5
• ?:or?:with ER6
• ?:or?:with ER4 ?:and?:without B39?:and?:without I8W?:and?:without I8Y
• ?:or?:with ER7

Repair Procedure Summary

The resolution for the issue of "customizations to the air conditioning function bar in the lower display not being saved" is a software update for the affected control unit. This software update is being rolled out in stages, depending on the specific country and vehicle equipment. For detailed update instructions and the current planning status for remaining updates, technicians are directed to consult TSB 2076404, titled "00 Deployment overview for customer service packages MLB and MQB for MIB3/connectivity." This update directly addresses the 2021 Audi e-tron MIB3 A/C settings not saving problem.

Important Notes for Owners

Owners should be aware that TSB 2079618/1 replaces a previous Pending Service Solution (PSS) TSB 2072285, which was titled "91 PSS MIB3: air conditioning function favorite on the lower display is lost." Notably, the release date for TSB 2079618/1 is October 7, 2025. This indicates that it is a future-dated document, and the software solution may not be immediately available for all vehicles. Audi is implementing the software update in stages, so it is recommended to consult your authorized Audi dealer for the most current information regarding availability for your specific vehicle.

Source: NHTSA ID: 11025290