2023-2024 Audi e-tron GT HVAC Air Distribution Malfunction TSB

Symptoms of HVAC Air Distribution Malfunction

Owners of 2023-2024 Audi e-tron GT and RS e-tron GT vehicles may notice that the heating or cooling temperature delivered from the air vents and outlets is erratic. This can manifest as uneven temperature distribution from side to side or upper to lower vents, or the system may not respond correctly to inputs from the display and control head. This indicates an Audi e-tron GT HVAC malfunction affecting climate control performance.

Fault Codes / DTCs

When an Audi e-tron GT HVAC malfunction occurs, one or more of the following Diagnostic Trouble Codes (DTCs) may be stored in the HVAC Electronics control module, J301 (address word 0008). These DTCs can be passive/sporadic or active/static:

DTC Code	Description
B109209	Recirculation flap motor Component malfunction
B10C909	Left side vent motor Component malfunction
B174F09	Right rear air door motor Component malfunction
B173D09	Right footwell flap motor Component malfunction
B10CA09	Right side vent motor Component malfunction
B109009	Defroster flap motor Component malfunction
B10D909	Left footwell temperature door motor Component malfunction
B174E09	Left rear air door motor Component malfunction
B116909	Left rear temperature door motor Component malfunction
B108C09	Left temperature flap positioning motor Component malfunction
B116A09	Right rear temperature door motor Component malfunction
B108D09	Right temperature flap positioning motor Component malfunction
B10B709	Airflow door motor Component malfunction
B174A09	Left center indirect ventilation door motor Component malfunction

Diagnosis and Technical Background

The root cause of this Audi e-tron GT HVAC malfunction is that the control door motor(s) run beyond their intended end stop. When this happens, the motor becomes blocked and can no longer properly adjust its corresponding air door or flap. To correct this, an update to the software for the HVAC Electronics control module, J301 (address word 0008), is required.

Important Warnings for Owners

For vehicles equipped with high-voltage components, it is crucial to note that the high-voltage cable must be removed BEFORE the SVM code is entered during the software update. Failure to do so, by charging the high-voltage battery during the software update, can potentially damage the high-voltage components.

Repair Procedure Summary

Technical Service Bulletin 87 23 42 2070449/1 outlines the following repair steps for the Audi e-tron GT HVAC malfunction:

1. High-Voltage Cable Removal: For vehicles with high-voltage components, the high-voltage cable must be removed prior to entering the SVM code to prevent damage.
2. Motor Replacement: The affected control door motor(s) must be replaced. The specific motor(s) will be identified based on the stored DTCs.
3. Software Update: The HVAC Electronics control module, J301, needs to be updated using SVM code 08A033. Technicians should follow the instructions provided in TSB 2011732 for Software Version Management (SVM) operating procedures.
4. End Stop Adaptation: After the software update, a control door motor end stop adaptation must be performed using the function "Addressing the A/C system actuators" in the GFF diagnostic tool.

Required Parts and Software

To address this issue, the following part may be required:

• Part Number: 8W0820511F
• Part Description: Motor for adjustment
• Quantity: Quantity necessary (depending on the number of affected motors)

The software update will bring the HVAC control module to a new software version 0710 (or higher) from an old software version 0525 (or higher), using part number 4J3907040*.

Warranty Information

This repair is covered under warranty for up to 48 months or 50,000 miles. For Audi Certified Pre-Owned (CPO) vehicles, the claim type is G10, and ownership must be verified. If the vehicle is outside of warranty, this Technical Service Bulletin serves as informational guidance only.

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Source: NHTSA ID: 10237406