2021-2026 Audi Cracking Noises When Changing Direction TSB

Symptoms

Owners of affected Audi vehicles may experience a distinct cracking noise when changing direction. This noise can originate from either the front or rear of the vehicle. On quattro models, the noise is specifically attributed to the prop shaft in some cases.

Another common symptom is a single crack noise heard when pulling off and changing direction. If you hear an Audi e-tron cracking noises or similar sounds from your vehicle, it's important to have it inspected.

Technical Background

Audi has identified that the cracking noise is caused by relative movement between the stub axle of the drive shaft and the wheel bearing. This friction or slight play results in the audible cracking sound. An optimized stub axle with improved teeth in the outer joint has been introduced in production to address this issue in newer vehicles.

Repair Procedure Summary

To resolve the cracking noises, technicians are instructed to bond the stub axle of the affected drive shaft to the wheel bearing using a specialized locking fluid. This procedure aims to eliminate the relative movement causing the noise.

Before proceeding with the repair, technicians must first reproduce the customer complaint to ensure it aligns with the conditions described in this TSB. The locking fluid, part number D 185400A3, is applied as a continuous bead around the stub axle, requiring approximately 5 ml per drive shaft. For vehicles with multi-link suspension, it may be necessary to release the upper link to facilitate removal of the outer joint from the hub.

Important Warning: After the bonding process is complete, the vehicle must not be driven for 8 hours. This crucial waiting period allows the locking fluid to cure properly and establish a secure bond.

Labor operations associated with this repair include bonding for one or two front or rear outer driveshafts (Service Numbers 4041 for front axle, 4221 for rear axle). Depending on the specific repair, additional tasks such as removing and installing wheels, detaching and re-attaching suspension links, adjusting headlights (9415 16XX), or calibrating the front camera (9638 15XX) may also be required.

Required Parts

The primary part required for this repair is:

• Locking fluid: Part number D 185400A3

Technicians should always consult the latest information from the Parts Department and/or ETKA for any additional fasteners, bolts, nuts, or screws as needed.

Owner Action

If you are experiencing cracking noises from your 2021-2026 Audi, particularly when changing direction or pulling off, it is recommended to contact an authorized Audi dealer. Describe the symptoms, such as the Audi e-tron cracking noises, to help the service department diagnose the issue correctly. This Technical Service Bulletin provides the repair procedure for this specific concern. Warranty coverage for this repair will depend on your vehicle's warranty status.

Source: NHTSA ID: 11030992