2009-2026 Audi Vehicles Front Noise in Dynamic Mode TSB

Audi has released Technical Service Bulletin (TSB) 2074729/2 to address customer complaints of noises and vibrations originating from the front of various Audi vehicles when driven in dynamic mode. This bulletin, dated December 6, 2024, supersedes a previous TSB, 24-76, from July 31, 2024, with updated verbiage regarding the condition.

This TSB applies to a wide range of Audi vehicles from model years 2009 to 2026, all equipped with an actuator for structure-borne sound. Owners experiencing an Audi e-tron front noise or similar issues in other models should be aware of this bulletin.

Symptoms of Front Noise and Vibration

Owners of affected Audi vehicles may notice various types of noises and vibrations emanating from the front of the vehicle, the engine compartment, dashboard, or center console, specifically when the vehicle is in dynamic mode. The reported noises include:

• "Humming"
• "Droning"
• "Rattling"
• "Whirring"

These symptoms collectively point to an issue that can significantly impact driving comfort and perception of vehicle quality.

Diagnosis and Workshop Findings

Audi workshops have found that these customer-reported noises and vibrations can be consistently reproduced. The source of these disturbances has been isolated to the "actuator for structure-borne sound," also referred to as an "impulse sender." This component is typically located within the plenum chamber of the vehicle.

To properly diagnose the issue, technicians are instructed to carefully inspect the installation of this actuator. Key inspection points include:

• Nut Tightness: Verify that the actuator's mounting nut is correctly tightened to specification.
• Free Movement: Ensure the actuator has unrestricted movement and is not making contact with the vehicle body, a bent bracket, or similar obstructions.
• Cable Routing: Check that the connecting cable for the actuator is routed correctly, without contact with the vehicle body or being under tension.

Repair Procedure Summary

If the initial inspection of the actuator's installation points (nut tightness, free movement, and cable routing) does not reveal any issues, technicians are advised to perform a final control diagnosis of the actuator. This diagnostic step helps to definitively confirm if the actuator itself is the root cause of the noise or vibration.

Once the issue is clearly isolated to the actuator for structure-borne sound, the recommended repair is to replace the actuator. This procedure is designed to resolve the humming, droning, rattling, or whirring noises experienced by vehicle owners.

Warranty and Claim Information

For vehicles still under warranty, this Technical Service Bulletin provides guidance for repair claims. If a vehicle is outside of its warranty period, the TSB serves as informational guidance only.

When submitting a warranty claim, the following details are relevant:

• Service Number: 2793
• Damage Codes: Specific codes are used to categorize the nature of the fault:
  • 0018: If the nut is not tightened correctly or if the actuator cannot move freely.
  • 0029: If the routing of the connecting cable is not correct.
  • 0010: If the component (actuator) is replaced.

For claim comments, reference TSB 2074729/1.

Important Notes for Owners

Audi requires specific documentation for warranty claims related to this issue. When billing for the repair, a video clearly showing the complaint must be attached to the warranty claim via DOC-IT. This video must include the vehicle's VIN and the date to ensure it matches the vehicle. It is crucial that the video documentation does not show any persons, faces, vehicle registration numbers, or customer data to protect privacy.

If you are experiencing an Audi e-tron front noise or similar symptoms in your Audi vehicle, it is recommended to contact an authorized Audi service center. They can perform the necessary diagnosis and repairs according to TSB 2074729/2.