2022-2025 Audi Multi-Model Diagnostic TSB 2066297

Audi has issued Technical Service Bulletin (TSB) 2066297, an on-car analysis list dated November 1, 2025, to assist technicians in diagnosing a variety of concerns across multiple Audi models. This bulletin provides specific instructions for addressing several Audi e-tron diagnostic issues and other common problems, ensuring proper analysis and resolution.

Important Warnings

Audi advises that technicians "Please contact Audi Helpline before attempting repair" for any of the issues outlined in this TSB. Additionally, for drive-motor coolant and gear oil cross contamination concerns, the document states, "If there are prior repairs to the drive motor this document ca can be disregarded," indicating that previous work on the drive motor might affect the diagnostic procedure.

Overview of Issues and Affected Models

TSB 2066297 details several distinct issues, each with specific diagnostic steps and applicable vehicles. Owners experiencing any of these symptoms should be aware of the guidance provided in this bulletin.

P1B1B00: Wear Limit Reached

This issue affects Audi A6, A7, A8, Q7, and Q8 models from 2019 to 2025. Owners may observe a "warning message and light in the cluster" related to the "P1B1B00 wear limit of main protection reached" fault.

P001700: Crankshaft Position-Camshaft Position Correlation Bank 1 Sensor B

For 2025 Audi Q5 (GU) models equipped with a 2.0L engine, this TSB addresses the diagnostic trouble code (DTC) P001700, indicating a correlation issue between the crankshaft and camshaft position sensors.

P0A8200: 48V Battery Cooling Fan Malfunction

Audi A3 models from 2022 to 2025 may experience issues with the 48V battery cooling fan, identified by DTC "P0A8200". This fault indicates a problem with the cooling system for the 48V battery.

B&O Extendable Tweeter Malfunction

Owners of 2023-2025 Audi A6, A7, A8, Q7, and Q8 models with the B&O audio system may notice that the "Tweeter gets stuck or shutters during operation". This affects the extendable/retractable tweeters located in the dashboard.

Drive-Motor Coolant and Gear Oil Cross Contamination

This critical issue pertains to 2019-2023 Audi e-tron quattro vehicles. It involves the contamination of the drive motor's coolant with gear oil, which can lead to significant powertrain problems. This is a key example of Audi e-tron diagnostic issues covered.

PPE/PPC Vehicles Time Off by 1 Hour

For 2025 Audi A5, Q5, A6 e-tron, and Q6 (FU, GU, GH, GF) models, the TSB addresses a concern where the "time is off by 1 hour". This can manifest as discrepancies in the vehicle's cluster, MMI settings, or navigation system.

Detailed Diagnostic Guidance

The TSB provides specific steps for technicians to follow for each identified issue, emphasizing thorough documentation and communication with Audi's technical assistance center (TAC).

For P1B1B00

Technicians are instructed to upload photos of the warning message and light in the cluster, along with a GFF LOG showing the DTC stored as ACTIVE/STATIC. The test plan for this DTC and other related 48V DTCs should also be performed and uploaded. Documentation must include the date and time of the customer's concern in the TAC ticket. On-site analysis is required, and technicians must contact TAC for further instructions.

For P001700

Diagnosis for this DTC involves verifying the P001700 code. Technicians are required to open a TAC ticket for a possible onsite visit to further investigate the issue.

For P0A8200

For 48V Battery Cooling Fan issues, a diagnostic LOG showing DTC "P0A8200" in DA0021 must be uploaded to paperless. Pictures taken during work instructions provided by TAC are also required for proper documentation.

For B&O Extendable Tweeter

To diagnose a stuck or shuttering B&O tweeter, technicians should take a short video demonstrating the concern. They must then fully extend the tweeter manually, cycle the key, and check if its function is restored. Faults should be cleared and re-evaluated. A WEB TAC case with all documentation is required.

For Drive-Motor Coolant and Gear Oil Contamination

This diagnostic process for Audi e-tron diagnostic issues requires several photos: the coolant reservoir or coolant collected from the front drive motor, a gearbox fluid sample in a white cup at a 45-degree angle, and any debris collected from the gearbox. Technicians must verify the customer's concern and determine if there have been any prior repairs to the drive motor or gearbox, as this may affect the relevance of the document.

For PPE/PPC Time Discrepancy

To address the "time is off by 1 hour" issue, technicians need to provide a photo of the time displayed in the cluster, the time settings in MMI, and another phone showing the navigation location and time, all in one photo. They must read all MVB's from Da0075 both when the issue is NOT present and when it is actively occurring, documenting the log ID. Specific location information, including an address or GPS location where the concern happens, is required. Technicians should also investigate if the issue can be duplicated on other vehicles or if the area of concern is close to another time zone.

Owner Action

If you own a 2022-2025 Audi model and are experiencing any of the symptoms described in TSB 2066297, such as warning lights, unusual tweeter behavior, or time discrepancies, it is recommended to contact your authorized Audi dealer. They have access to this technical bulletin and the necessary diagnostic procedures to address these Audi e-tron diagnostic issues and other concerns effectively.

Source: NHTSA ID 11026202.