2016-2026 Audi Suspension Noise Diagnosis TSB 2076604/2

Understanding Audi TSB 2076604/2

Audi has issued Technical Service Bulletin (TSB) 2076604/2, titled "40 Locating noises coming from suspension," to provide general assistance in diagnosing various noises originating from the suspension system of 2016-2026 Audi vehicles. This TSB is not specific to a single complaint but offers a structured approach for technicians to identify the root cause of these auditory issues. The bulletin was initially published on January 15, 2025, as Revision 1, and subsequently updated with a revised header (Revision 2) on September 29, 2025, to add model years.

Symptoms of Suspension Noises

Owners of affected Audi vehicles may experience a range of noises and vibrations emanating from different parts of the vehicle's suspension. These symptoms can include:

• Thumping: Often heard from the vehicle's front or rear areas, indicating potential issues with suspension components.
• Vibrating: Can manifest in both the front and rear of the vehicle, suggesting a general vibration issue within the suspension system.
• Squeaking: Commonly reported from the front or rear suspension, which might point to worn bushings or joints.
• Snapping: May occur in the front or rear suspension, potentially due to components shifting or breaking.
• Crunching, Groaning, or Crackling: These noises can originate from the front or rear vehicle areas, or specifically from the wheel suspension, suspension, or damping components like shock absorbers, indicating friction or binding.
• Too Loud: General noises that are unusually prominent from the front or rear, suggesting an abnormal sound level.
• Pinging: A distinct metallic sound that can come from the rear or front, often associated with loose or impacting metal parts.
• Chattering: Often heard from the front or rear of the vehicle, which could be related to loose or vibrating components.
• General Noise: Undefined noises from the front or rear, or specifically related to the brake system, steering, wheels, tires, tire pressure monitoring, or the level control system, requiring detailed investigation.

These various forms of Audi suspension noise indicate a potential issue with different suspension components, requiring a thorough diagnostic process to identify the exact source.

Diagnostic Approach and Service Procedure

TSB 2076604/2 outlines a detailed, systematic approach for technicians to diagnose the Audi suspension noise. The process emphasizes careful observation, reproduction of the complaint, and systematic elimination of potential sources.

Initial Assessment and Road Test

The first critical step involves performing a road test with the customer present. This allows the technician to experience the reported noise firsthand and reproduce it under conditions similar to when the owner first noticed it. This direct observation provides valuable context for the diagnostic process.

Pinpointing Noise Location and Characteristics

Technicians are instructed to determine the precise area where the noise occurs, identifying if it originates from the front end, rear end, or side of the vehicle. Further investigation includes assessing whether the noise is more clearly heard inside the vehicle cabin or from the outside as the vehicle passes. It's also important to note if the noise's loudness varies at specific locations or depends on the technician's seating position within the vehicle.

Understanding Conditions and Driving Situations

Understanding the specific circumstances under which the Audi suspension noise manifests is crucial. Technicians should investigate external conditions such as temperature and precipitation, as well as road surface properties and unevenness. Driving situations like speed, acceleration, deceleration, steering wheel angle, driving direction (forwards/backwards), selected gear, engine speed range, pedal operation, drive select mode, and vehicle load condition can all significantly influence when and how the noise appears.

Characterizing the Noise

Describing the noise's characteristics helps narrow down potential causes. Technicians are asked to consider the subjective description of the noise (e.g., metallic sound, hollow sound), how often it occurs (always, sporadically, only when the vehicle is started), and if it's limited to specific durations like only on short or long trips.

Documentation

To aid in diagnosis and future reference, technicians are advised to record a video or audio file documenting the noise. This provides an objective record of the symptom, which can be helpful for collaboration or further analysis.

Correlating with Other Phenomena

It's important to check if the noise coincides with any other vehicle phenomena that could be logically connected. This includes observing if the vehicle is tilted, if there are worn parts, or if any warning lamps are illuminated or event memory entries are present, as these could provide clues to the noise's origin.

Reproducing on a Lifting Platform

If possible, technicians should attempt to reproduce the noise while the vehicle is on a lifting platform. This can be done by manually moving components or creating vibrations. Having one person listen where the noise is loudest while another creates the vibration can be a very effective method for isolating the source.

Electronic Component Testing

Diagnosis can also involve activating or deactivating electronic components (e.g., using final control diagnosis or basic settings) to see if the noise changes or disappears. Disconnecting running gear components or control units, such as assembly mountings or the anti-roll bar, can help isolate the source by eliminating potential contributors.

Identifying Related Components

Technicians should consider which other components might cause vibrations and if the noise is connected to direct or adjacent parts that perform movement (linear movement, bearing point, rotation). Temporarily decoupling components can reveal if the noise is eliminated, thereby identifying the problematic part.

Component Swapping

As a diagnostic step, swapping components can help determine if the noise moves with a particular part, indicating that the swapped component is the source of the Audi suspension noise.

Specialized Diagnostic Tools

To precisely locate the source of the Audi suspension noise, the TSB strongly recommends using acoustic measuring devices and noise location tools. These specialized tools enhance the accuracy and efficiency of the diagnostic process:

• PICO tool VAS 611015: This advanced tool is recommended for precise acoustic measurements. Technicians should refer to TSB 2070568 or the Audi Knowledge Tank, using the search term "PICO tool," for detailed instructions and information on its operation and application.
• Chassis Ear: A common diagnostic tool used to amplify and pinpoint noises within the chassis and suspension components.
• V.A.G 1842: Another specialized tool from the Volkswagen Audi Group (V.A.G) designed for noise detection and analysis.

These tools enable technicians to perform measurements at various points (different sides of the vehicle, inner/outer sections) simultaneously, moving systematically towards the noise source based on their perception and the data collected.

Important Warnings and Technician Considerations

This TSB includes critical advisories for technicians to ensure effective and responsible diagnosis and repair:

• Component Replacement Strategy: When replacing components, technicians should always consider the least expensive component first. As a general rule, no components should be replaced without reasonable suspicion, preventing unnecessary costs and repairs.
• Technical Repair Query Submission: Technicians must work through all recommendations in this TSB before submitting a technical repair query. The basis for processing any query is a qualified initial analysis performed by the workshop. The completed TSB, with all findings, must be submitted; otherwise, the situation cannot be assessed remotely.
• Documentation Requirements: Technicians are required to attach photos to the DOC-IT and/or TAC case. These photos must clearly show how and where the noise measurements were taken with the specified tools, providing essential visual evidence for the diagnostic process.
• Training Courses: Technicians are encouraged to make use of the training courses on this topic offered by Technical Training to further enhance their diagnostic skills.

Important Warranty Information

It is important for owners to note that this TSB (2076604/2) is informational only and is not applicable to any Audi Warranty. This means that diagnostic and repair costs associated with suspension noises may not be covered under standard warranty terms, depending on the specific issue and vehicle warranty status. All part and service references in this TSB are subject to change, and technicians should always check with their Parts Department and/or ETKA for the latest information and parts bulletins. Additionally, the Repair Manual should be consulted for fasteners, bolts, nuts, and screws that require replacement during the repair.

NHTSA ID: 11023772