2022-2024 Audi e-tron GT Uneven HVAC Output TSB 2070449/3

Audi has released Technical Service Bulletin (TSB) 2070449/3 to address customer complaints regarding uneven heating and cooling output, as well as poor air distribution in 2022-2024 Audi e-tron GT and RS e-tron GT vehicles. This bulletin, released on May 6, 2025, indicates a software issue within the HVAC control unit that can cause climate control motors to run past their intended end stops, leading to various climate system malfunctions.

This issue, which affects the Audi e-tron GT uneven HVAC output, can result in an uncomfortable cabin environment. Owners may notice that their vehicle cools instead of heats, or that air conditioning does not regulate correctly. The TSB provides diagnostic trouble codes and a repair procedure to correct this software-related problem.

Revision History

Technical Service Bulletin 2070449/3 has undergone several revisions:

• Revision 3: Updated the title, header, condition, technical background, production solution, service, and warranty sections. It also removed the table and image related to required parts and tools.
• Revision 2 (December 18, 2023): Revised the header to add Model Year 2022.
• Revision 1 (May 30, 2023): Initial publication of the bulletin.

Symptoms of Uneven HVAC Output

Owners of affected 2022-2024 Audi e-tron GT and RS e-tron GT models may observe several symptoms related to their vehicle's climate control system. These include:

• Uneven heating output or uneven cooling output.
• The vehicle cooling when heating is expected.
• Inconsistent temperatures at the vents.
• The air conditioning system failing to regulate correctly.
• Issues with air distribution control, leading to functionality that is "not adjustable" or has "no function".
• Manual heating or climate control modes exhibiting "operation sequence incorrect" functionality.
• Automatic climate control mode (AUTO) showing "misfire" functionality.
• Climate control unit heat or cooling output being "irregular".
• Ventilation with fresh air blower at various levels (1, 3, 5) having "no function" or being "too little".
• Side window defroster vent issues, potentially indicating "damaged" components.

Fault Codes / DTCs

Workshop findings indicate that these symptoms are often accompanied by specific Diagnostic Trouble Codes (DTCs) logged in the control unit for air conditioner/heater electronics (diagnostic address 0008). These codes typically point to malfunctions of various flap and door motors within the HVAC system.

Diagnostic Address	Diagnostic Trouble Code	Fault Symptom	Storage State
0008 - HVAC electronics	B109209: Recirculation flap motor Component malfunction		static/intermittent
0008 - HVAC electronics	B10C909: Left side vent motor Component malfunction		intermittent/static
0008 - HVAC electronics	B174F09: Right rear air door motor Component malfunction		intermittent/static
0008 - HVAC electronics	B173D09: Right footwell flap motor Component malfunction		intermittent/static
0008 - HVAC electronics	B10CA09: Right side vent motor Component malfunction		intermittent/static
0008 - HVAC electronics	B109009: Defroster flap motor Component malfunction		intermittent/static
0008 - HVAC electronics	B10D909: Left footwell temperature door motor Component malfunction		intermittent/static
0008 - HVAC electronics	B174E09: Left rear air door motor Component malfunction		static/intermittent
0008 - HVAC electronics	B116909: Left rear temperature door motor Component malfunction		intermittent/static
0008 - HVAC electronics	B108C09: Left temperature flap positioning motor Component malfunction		intermittent/static
0008 - HVAC electronics	B116A09: Right rear temperature door motor Component malfunction		intermittent/static
0008 - HVAC electronics	B108D09: Right temperature flap positioning motor Component malfunction		intermittent/static
0008 - HVAC electronics	B10B709: Airflow door motor Component malfunction		intermittent/static
0008 - HVAC electronics	B174A09: Left center indirect ventilation door motor Component malfunction		intermittent/static

Technical Background

The root cause of the Audi e-tron GT uneven HVAC output and related malfunctions is identified as a software issue within the control unit for the air conditioner. This software flaw causes the control motors to run past their intended end stops, leading to incorrect flap and door positioning and, consequently, poor air distribution and temperature control.

Important Warning

CAUTION: To prevent the high-voltage battery from charging during the software update, the high-voltage charging cable on vehicles with high-voltage components must be unplugged BEFORE the SVM code is entered.

Repair Procedure Summary

To resolve the uneven HVAC output issue, technicians should follow these steps outlined in TSB 2070449/3:

1. If necessary, replace any affected control motor. The TSB implies that a motor replacement might be needed if the motor is physically damaged from continually running past its end stop.
2. Run the SVM code 08A033. This is a crucial step for initiating the software update process.
3. Follow all instructions detailed in TSB 2011732, titled "00 Software Version Management (SVM), operating instructions," for proper SVM procedures.
4. Update the A/C control module, identified as J301 (diagnostic address 0008), using the SVM action code 08A033. The required software update involves changing the A/C control module from an Old Software Version of 0525 to a New Software Version of 0710 for the software part number 4J3907040*.
5. After the software update is complete, a control door motor end stop adaptation must be performed. This adaptation is done using the function "Addressing the A/C system actuators” within the Guided Fault Finding (GFF) system.

Warranty Information

For vehicles still under warranty, claims submitted for this repair must adhere to the Audi Warranty Policies and Procedures Manual. The relevant details for warranty claims are:

• Service Number: 8720
• Damage Code: 0040
• Labor Operations:
  • Positioning motor remove and reinstall: Labor code 8720 19XX (refer to SRT for associated operations)
  • Software Update (Includes checking for DTCs): Labor code 0151 0000 (time stated on the diagnostic protocol)
  • Charge battery: Labor code 2706 8950 (refer to SRT for associated operations)
• Claim Comment: As per TSB 2070449/3

If the vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only, and repair costs may be the owner's responsibility.

Source

NHTSA ID: 10249767