2021-2025 Audi e-tron Coolant Contamination TSB

Audi has issued Technical Service Bulletin (TSB) 2066297, an on-car analysis list, to address several distinct concerns affecting various 2021-2025 Audi models. This TSB provides detailed instructions for technicians on how to diagnose and document these issues for the Audi Technical Assistance Center (TAC).

Symptoms

Owners may observe a range of symptoms depending on the specific issue:

• Warning Message/Light: A warning message or light may appear in the instrument cluster, often related to a P1B1B00 wear limit of main protection reached fault.
• Tweeter Malfunction: For vehicles equipped with the B&O audio system, the extendable/retractable tweeter in the dash may get stuck or shutter during operation.
• Fluid Contamination: For e-tron models, there may be signs of drive-motor coolant and gear oil cross contamination.
• Engine Performance: Issues related to crankshaft and camshaft position correlation, potentially indicated by DTC P001700.
• Battery Cooling Fan: Malfunctions with the 48V battery cooling fan, possibly triggering DTC P0A8200.
• Incorrect Time Display: The vehicle's clock may be off by one hour, a concern noted for PPE/PPC vehicles.

Fault Codes / DTCs

Technicians may find the following Diagnostic Trouble Codes (DTCs) when scanning affected vehicles:

Diagnosis and Trigger Conditions

Audi's TSB outlines specific diagnostic steps for each concern:

• For P1B1B00: Technicians must capture photos of the warning message/light in the cluster, upload GFF LOG data showing the DTC as ACTIVE/STATIC, and include the test plan for this and other related 48V DTCs. The date and time of the customer's concern must be documented, and on-site analysis may be required.
• For P001700: The TSB instructs technicians to verify the P001700: Crankshaft Position-Camshaft Position Correlation Bank 1 Sensor B fault and open a TAC ticket for potential on-site assistance.
• For P0A8200: A diagnostic LOG showing DTC P0A8200 in DA0021 should be uploaded to paperless, along with pictures taken during work instructions provided by TAC.
• For B&O Extendable Tweeter: Technicians should record a short video demonstrating the tweeter malfunction. They must then manually extend the tweeter, cycle the key, and check if the function is restored. Output diagnosis should be verified, faults cleared, and re-evaluated. A WEB TAC case with all documentation is required.
• For e-tron coolant contamination: This requires photos of the coolant reservoir, coolant collected from the front drive motor, gearbox fluid samples (taken at a 45° angle), and any debris found in the gearbox. Technicians must verify the customer's concern and check for any prior repairs to the drive motor or gearbox, as this document may be disregarded if previous repairs exist.
• For PPE/PPC Vehicle Time Off: Photos of the time displayed in the cluster and MMI settings, along with a navigation location and time from another phone, are needed. Technicians must read all Measured Value Blocks (MVBs) from Da0075 both when the issue is not present and when it is actively occurring. Specific location information, duplication on other vehicles, proximity to other time zones, and GPS location of the concern area are also required.

Repair Procedure Summary

This TSB primarily focuses on comprehensive data collection and documentation for the Audi Technical Assistance Center (TAC) rather than providing a direct repair procedure. For each identified issue, technicians are instructed to gather specific evidence, such as diagnostic logs, photos, and videos, and to document customer concerns thoroughly. This information is then submitted to TAC for further instruction or on-site analysis, indicating that the repair strategy will be determined based on the collected data and Audi's expert guidance.

Owner Action

If you experience any of the symptoms described above, particularly e-tron coolant contamination or a warning light in your 2021-2025 Audi, it is recommended to contact your authorized Audi dealership. They will be able to perform the necessary diagnostic steps outlined in TSB 2066297 and consult with Audi's Technical Assistance Center to determine the appropriate resolution. Since this is a manufacturer communication, diagnostic work related to these issues is typically covered under warranty.

Source: NHTSA ID 11026202