2022-2023 Audi e-tron GT HVAC Control Head Switches Off TSB

Audi has issued Technical Service Bulletin (TSB) 87 21 17 2064830/1 to address an intermittent issue affecting the HVAC system in certain 2022-2023 Audi e-tron GT and RS e-tron GT vehicles. This TSB provides instructions for a software update to correct the problem where the HVAC control head unexpectedly switches to 'off'. Owners searching for solutions to their "Audi e-tron GT HVAC off" problem will find the details of the official fix here.

Symptoms

Owners of affected vehicles may experience the following:

• HVAC control head is discovered in the 'off' mode: After the vehicle has been off for a period long enough to enter a bus sleep cycle, the HVAC control head is found in the 'off' position when the vehicle is re-entered and started. This occurs even if the customer did not manually select the 'off' mode.
• The customer must then manually turn the HVAC system back on.
• The symptom is intermittent and may be difficult to reproduce.

It is important to note that no Diagnostic Trouble Codes (DTCs) are stored in the A/C control module (J301, address word 0008) when this specific "Audi e-tron GT HVAC off" condition occurs.

Technical Background

The root cause of the issue is an intermittent misinterpretation by the HVAC control head of the customer's last settings input. This misinterpretation causes the system to default to the 'off' mode after the vehicle undergoes a bus sleep cycle. The software in the A/C control module (J301, address word 0008) requires an update to resolve this behavior. Specifically, software version 0525 is identified as the affected version.

Important Warnings

For vehicles equipped with high-voltage components, such as the Audi e-tron GT, a critical precaution must be taken during the software update procedure:

• High-voltage cable removal: To prevent potential damage to high-voltage components, the high-voltage cable must be removed BEFORE entering the SVM code for the software update. Charging the high-voltage battery during the software update process can lead to damage.

Repair Procedure Summary

The repair involves updating the software for the A/C control module (J301). This procedure is outlined in Audi Technical Service Bulletin 87 21 17 2064830/1 and requires following the instructions in TSB 2011732, titled "00 Software Version Management (SVM), operating instructions."

Technicians will update the A/C control module, J301 (address word 0008), using the SVM action code 08A033. The old software part number is 4J3907040* with version 0525. The update will install new software version 0710, also with part number 4J3907040* (or higher). An improved air conditioning system control unit with software version 0710 has been released in production to prevent this issue in newer vehicles.

Warranty Information

This software update is covered under warranty for:

• New vehicles: Up to 48 months or 50,000 miles.
• Certified Pre-Owned (CPO) vehicles: Covered under the G10 program, requiring verification of owner status.

If the vehicle is outside of any applicable warranty, this Technical Service Bulletin serves as informational guidance only. The Service Number for this procedure is 8711, and the Damage Code is 0039. The labor operation for the software update, including checking for DTCs, is 0151 0000, with a maximum allowance of 50 Technical Units (TU).

Owner Action

If you own a 2022-2023 Audi e-tron GT or RS e-tron GT and are experiencing the "Audi e-tron GT HVAC off" symptom, you should schedule an appointment with an authorized Audi dealership. The dealership technicians will perform the necessary software update to the A/C control module (J301) as described in TSB 87 21 17 2064830/1.

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Source: NHTSA ID: 10203689