2024-2025 Audi Models Front Axle Guide Link Bush Noises

Audi has released Technical Service Bulletin (TSB) 40 25 93 2076605/1, dated January 15, 2025, to address customer complaints regarding sporadic rattling and clacking noises emanating from the front axle. This TSB applies to a wide range of 2024-2025 Audi models and provides an explanation for the Audi guide link bush noise.

This informational bulletin helps technicians and owners understand the root cause of these sounds and clarifies that the guide link bush is functioning as intended despite the noise.

Symptoms of the Audi Guide Link Bush Noise

Owners may notice a distinct sporadic rattling or clacking noise originating from the front axle. These sounds are typically heard when the vehicle is rolling slowly, specifically at speeds under 12 mph. The noises are most prominent when driving over uneven road surfaces, such as cobblestones, or when traversing curbs.

Diagnosis and Trigger Conditions

When investigating the Audi guide link bush noise, technicians are advised that it is not productive to diagnose noises at temperatures below 32°F (0°C). At these low temperatures, the rubber bushes in the running gear harden, which can alter noise characteristics. Additionally, the presence of snow, ice, or grit can interfere with accurate noise analysis.

To precisely identify if the noise is coming from the guide link bush, technicians can utilize specialized equipment. The TSB recommends using the PICO tool VAS 611015 or other noise analysis tools. Further reference for this diagnostic process can be found in TSB 2070568 or by searching for "PICO" in the Audi Knowledge Tank.

Technical Explanation of the Noise

The rattling and clacking noises are caused by an air bubble that becomes enclosed within the guide link hydro-bush during its manufacturing process. This air bubble is designed to decouple the suspension from micro-amplitudes, which enhances the vehicle's interior acoustics, especially on rough asphalt, and positively influences steering behavior.

When the axle experiences vibrations from uneven road surfaces, particularly multiple brief, hard knocks, the high-frequency changes in the bush's internal pressure cause the volume of this air bubble to fluctuate. This phenomenon can lead to the characteristic rattling or clacking noises, especially under certain climatic conditions. Despite these noises, the TSB clarifies that the bush itself is functioning as designed under all conditions.

Important Notes for Owners

Owners should be aware that this Technical Service Bulletin 40 25 93 2076605/1 is purely informational. It is not associated with any Audi Warranty claims, meaning any diagnostic work or potential replacement of parts would typically not be covered under warranty. The TSB explicitly states that the guide link bush functions as it should, and the noises are a characteristic of its design and manufacturing process.

What Owners Should Do

If you experience the described Audi guide link bush noise in your 2024-2025 Audi model, you may consult with an authorized Audi dealer. The dealer can perform a diagnosis to confirm the source of the noise. However, it is important to understand that this TSB is for informational purposes, explaining the technical background of the noise rather than outlining a repair procedure for a defect.

Source: NHTSA ID: 11013719