2021-2023 Audi e-tron Rear Axle Noise TSB 2064019/2

Symptoms

Owners of 2021-2023 Audi e-tron vehicles may notice rumbling or rattling noises emanating from the rear axle area. These noises are typically heard when driving over irregularities in the road surface.

Technical Background

Audi's Technical Service Bulletin (TSB) 2064019/2, originally issued on July 15, 2021, and revised on June 9, 2022, identifies the root cause of the Audi e-tron rear axle noise. The issue stems from frozen water or dirt accumulating above the shock absorber mountings. When temperatures drop below 32°F, this frozen debris can restrict the proper operation of the shock absorber mounting, leading to the audible rumbling or rattling.

Diagnosis and Trigger Conditions

Workshop findings indicate that the Audi e-tron rear axle noise can be consistently reproduced when the vehicle is driven between 5 and 30 mph, specifically at outside temperatures below 32°F. Technicians can confirm the concern by carefully heating the shock absorber mounting and then re-evaluating the vehicle for the noise. This diagnostic step helps determine if the temperature-dependent freezing of water or dirt is indeed the cause.

Repair Procedure Summary

To resolve the rumbling/rattling noises from the rear axle, the TSB outlines a specific repair procedure:

1. Remove Rear Shock Absorbers: Both rear shock absorbers must be removed according to the detailed instructions found in the Elsa Repair Manual, under Chassis >> Suspension, Steering, Wheels >> 42 Rear Suspension >> Suspension Strut, Shock Absorber, Spring.
2. Replace Shock Absorber Mountings: The shock absorber mountings on both sides of the vehicle are to be replaced. Figure 1 in the TSB illustrates the components, with item 6 specifically pointing to the shock absorber mounting.
3. Apply Butyl Sealing Cord: After installing the new mountings, approximately 10 inches of butyl sealing cord must be applied to each side of the vehicle. This cord creates a seal between the protective cap (item 4 in Figure 1) and the newly installed shock absorber mounting (item 6 in Figure 1). The TSB includes images (Figure 1, pictures 2 and 3) demonstrating the correct application of the butyl sealing cord.
4. Ensure Clean Surfaces: Before applying the butyl sealing cord, it is crucial to ensure that the sealing surfaces of both the new shock absorber mounting and the corresponding shock absorber protective cap are clean and dry. The original shock absorber cap (item 4) can be reused if it is in good condition.

Required Parts and Tools

Technicians will need to consult ETKA and/or ELSA for the latest information on fasteners, bolts, nuts, and screws required for the repair. Specific parts include:

• Shock absorber mounting: Quantity 02 (Part number to be sourced via ETKA)
• Butyl Sealing Cord: Part Number AKD49701004R10, Quantity 0.1

Warranty Information

This repair is covered under Audi's warranty for up to 48 months or 50,000 miles, whichever comes first, under Claim Type 110. The Service Number associated with this repair is 4295, and the Damage Code is 0020. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual.

Important Warnings

• If your vehicle is outside of the specified warranty period or mileage, this Technical Service Bulletin serves as informational guidance only, and the repair may not be covered.
• The concern is highly dependent on temperature, as it is caused by ice or frozen dirt. A simple check involves heating the shock absorber mounting to see if the noise temporarily resolves.

NHTSA ID: 10214461