2023-2026 Audi Vehicle Vibrations TSB 2074846/4

Symptoms

Owners of 2023-2026 Audi vehicles may notice vibrations when driving between 35 and 70 mph (60–150 km/h). These vibrations can be felt in various parts of the vehicle, including the seat surface, vehicle floor, footwell, pedal cluster, or the steering wheel. The vibrations might intensify during braking or acceleration, or they may only manifest during specific driving phases. If you're experiencing Audi e-tron vibrations, this TSB provides guidance.

Diagnosis and Trigger Conditions

The primary cause of these vibrations is often related to tire characteristics, specifically radial force variation. Tires naturally have softer and stiffer areas around their circumference, leading to variations in compression force as the tire rolls. This radial force variation is measured using specialized equipment like the vibration control system VAS6230(A).

For proper diagnosis, the peak-to-peak value of the radial force variation should not exceed 120N, and the first harmonic vibration, which causes the strongest vibrations, must be 80N or less.

Another contributing factor can be flat spots on tires, which develop after the vehicle has been stationary for even a short period. These flat spots can falsify radial force variation measurements. It is crucial to drive the vehicle to warm up the tires and remove any flat spots before performing any wheel balancing procedures.

Repair Procedure Summary

To address vibrations and rotational steering wheel vibrations, technicians should follow a specific sequence of steps:

1. Test Drive: Perform a test drive of up to 20 miles at various speeds, reaching up to 65 mph, to confirm the customer's complaint.
2. Vehicle Preparation: Immediately after the test drive, raise the vehicle so the wheels are off the ground.
3. Wheel Removal: Remove the wheels and mount them onto the vibration control system VAS6230(A).
4. Measurement and Balancing: Measure, balance, and, if necessary, match the wheels according to the instructions provided by the equipment. Ensure the radial force variation values meet the specified limits (peak-to-peak ≤ 120N, first harmonic ≤ 80N).
5. Wheel Installation: Fit the wheels back onto the vehicle following the instructions from the Hunter equipment.
6. Tire Pressure Adjustment: Restore the vehicle's tire pressure to the manufacturer's recommended specifications.
7. Final Assessment: Conduct another assessment of the vehicle in the speed range where the original complaints occurred to ensure the Audi e-tron vibrations are resolved.

If the first harmonic vibration of the radial force cannot be brought within the 80N limit through matching, a new tire must be installed. When tightening wheels on the vibration control system, ensure the flange and wheel contact surfaces are clean, the wheel is correctly centered, and a suitable taper and tensioning device (such as a five-finger tensioning device) is used.

Required Tools or Parts

Technicians will require specific tools to accurately diagnose and repair this vibration issue:

• VAS 6230 (GSP9700): Road Force Measurement System
• VAS 6243: Clamping Plate

Owner Action

If your 2023-2026 Audi vehicle is experiencing vibrations, it is recommended to visit an authorized Audi dealer. They will use the procedures outlined in TSB 2074846/4 to diagnose and resolve the issue. Warranty claims for this service, identified by Service Number 4440 and Damage Code 0013, are processed according to the Audi Warranty Policies and Procedures Manual. If the vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only.