2017-2023 Audi Quattro Ultra Vibrations in Turns TSB

Owners of various 2017-2023 Audi models equipped with the Quattro Ultra system may experience vibrations, humming, droning, or binding sensations. These Audi quattro Ultra vibrations are particularly noticeable when turning the steering wheel fully or when accelerating quickly from a stop with the wheels turned. Audi has released Technical Service Bulletin (TSB) 39 23 56 2059057/6 to provide diagnostic and repair instructions for these symptoms.

This TSB, dated October 9, 2023, supersedes an earlier bulletin, Group 39 number 22-49, issued on November 2, 2022, and includes updated service procedures and warranty information.

Symptoms

Owners may notice the following symptoms related to Audi quattro Ultra vibrations or binding:

• Drivetrain Noises: Sounds emanating from the drivetrain when accelerating quickly from a stop, especially with the steering wheel turned.
• Vibrations and Sensations: Vibrations, humming, droning, or rubbing sensations felt in the vehicle interior or rear seats when the steering wheel is fully turned.

Upon workshop inspection, technicians can typically reproduce these noises and sensations, attributing them to the all-wheel-drive clutch, propeller shaft, or rear differential. Importantly, no diagnostic trouble codes (DTCs) are typically stored in the transmission control module (TCM) J217 (address word 002) or the all-wheel-drive control module J492 (address word 0022) when this condition is present.

Technical Background

The root cause of these Audi quattro Ultra vibrations and binding issues stems from the differing speeds between the front axle differential and the rear final drive. In scenarios involving very tight cornering and a closed four-wheel-drive clutch 1, this speed difference can lead to varying degrees of humming, drumming, vibrations, or binding within the drivetrain.

Repair Procedure Summary

The repair outlined in TSB 39 23 56 2059057/6 involves a multi-step process, beginning with an all-wheel-drive clutch fluid exchange. If the issue persists, the all-wheel-drive clutch may need to be replaced.

1. Initial Assessment: Verify if the TSB procedure has been previously performed. Ensure the transmission is at operating temperature.
2. Diagnostic Data Collection: Use ODIS Guided Functions to access the All-Wheel Drive Electronics (address 0022) control module. Read and upload measured values to the diagnosis log.
3. ATF Drain and Documentation: Completely drain the automatic transmission fluid (ATF) from the four-wheel-drive clutch 1. Document the ATF quality with date-stamped, VIN-referenced photos.
4. First ATF Fill and Drive Cycle: Fill with new ATF (part number G 055 515 A2), set the ATF level, and drive the vehicle to reach operating temperature. Allow the vehicle to cool for at least 30 minutes.
5. Second ATF Fill and Drive Cycle: Drive the vehicle to operating temperature again, then completely drain the ATF. Refill with new ATF (part number G055 515 A2), set the level, and replace the sealing bolts. Drive to operating temperature once more and allow to cool for at least 30 minutes.
6. Basic Setting Reset: Perform the