2023-2025 Audi Quattro Droning Noises / Vibrations TSB 2075681/4

Symptoms

Owners of 2023-2025 Audi Quattro vehicles equipped with ultra technology may experience specific issues related to the drivetrain. These include audible droning noises and vibrations originating from the gearbox, drive shaft, or rear final drive. These symptoms are particularly noticeable when pulling away quickly from a standstill with the wheels turned.

Additionally, vibrations, humming, droning, or rubbing sensations may be felt within the vehicle's interior, including the rear seats, especially when the steering wheel is turned to its full lock position. These Audi Quattro droning noises and vibrations indicate a potential issue with the vehicle's four-wheel drive system.

Fault Codes / DTCs

After the repair procedure, technicians are instructed to check for and erase the event memory entry "C05DC00 4WD/AWD Clutch Temperature Too High" in the all-wheel drive electronics module. This DTC (Diagnostic Trouble Code) indicates that the all-wheel drive clutch temperature has exceeded normal operating limits.

Diagnosis / Trigger Conditions

This issue, leading to Audi Quattro droning noises and vibrations, is often linked to the friction system of the four-wheel drive clutch. Over time, if the vehicle has a very low proportion of all-wheel drive use, the clutch's friction system may change slightly. The problem is typically reproducible by turning the steering wheel to full lock and driving in tight circles.

To confirm the complaint, technicians should attempt to reproduce the symptoms based on the customer's description. It is crucial that all vehicle criteria, such as model type, chassis number, engine/gearbox code, and PR number(s) like GH4, precisely match the specifications outlined in Technical Service Bulletin 2075681/4. Failure to meet these criteria may result in a rejected warranty claim.

Important Warnings

Technicians performing this service must adhere to strict safety guidelines:

• Distracted Driving: Using application programs while driving can distract the driver, potentially leading to accidents. Road traffic regulations take priority over any driving instructions. The test program must always be performed with a second person operating the test equipment, ensuring the equipment does not distract the driver.
• Unsecured Test Equipment: Transporting unsecured test equipment or placing it in areas where airbags inflate can cause injuries during maneuvers or in an accident. Ensure all test equipment is properly secured and, if possible, use it on the rear seat bench. If no rear seat bench is available, keep the equipment flat on the passenger's lap, with the passenger operating it and the seat moved as far back as possible.
• Test Abort Condition: During the frictional vibration test, if a speed of 11 km/h (~7 mph) is exceeded, the test will be automatically aborted. In such cases, the test procedure must be restarted from the beginning.

Repair Procedure Summary

The repair for Audi Quattro droning noises and vibrations involves a specific diagnostic and function test using the ODIS tester, as detailed in TSB 2075681/4. The procedure is as follows:

1. Drive the vehicle to a safe, cordoned-off area where it is possible to drive in circles safely with the steering wheel at full lock. No other traffic should be present.
2. Allow the vehicle to reach its operating temperature before parking it in the designated area.
3. Connect the ODIS tester. Expand the test plan by entering the reference number 2074883. Then, add the suggested test program "-0022 – Function test of clutch for frictional vibration" to the test plan. It is critical NOT to search for this test plan using the "Select self test" option; detailed instructions are provided in the "TestPlanAssignment.pdf" document.
4. Start the "-0022 – Function test of clutch for frictional vibration" and select "-1- Target torque 150 Nm" to perform the test program.
5. With the engine idling and brakes applied, turn the steering wheel to full lock. Release the brakes and slowly increase the vehicle speed to a maximum of 10 km/h (6 mph). Drive in circles until the Audi Quattro droning noises symptoms no longer occur. This process may take several minutes. If temperature monitoring stops the test prematurely, or if the "Four-wheel drive overheating" warning lamp and message activate, the procedure may need to be repeated up to three times if the customer complaint persists.
6. After successfully completing the test, check the all-wheel drive electronics for the event memory entry "C05DC00 4WD/AWD Clutch Temperature Too High" and erase it if present. The complete diagnostic log should be provided online.

Warranty Information

This Technical Service Bulletin (TSB) 2075681/4 provides guidance for addressing the droning noises and vibrations. If the vehicle is outside of its warranty period, this bulletin is for informational purposes only. Warranty claims must comply with the Audi Warranty Policies and Procedures Manual.

• Service Number: 3960
• Damage Code: 0020
• Labor Operations:
  • Measure all-wheel drive clutch unit (four-wheel drive overheating): 3960 0399 (30 Time Units)
  • GFF: 0150 0060 (Time stated on the diagnostic protocol)
  • Road test prior to service procedure: 0121 0002 (10 Time Units)
  • Road test after service procedure: 0121 0004 (10 Time Units)
  • Charge battery: 2706 8950 (See SRT with associated operations)
• Claim Comment: As per TSB 2075681/4

Source: NHTSA ID 11021455