2025 Audi Generic Scan Tool Errors TSB 2078765/1

Symptoms

Owners or technicians using a generic scan tool (GST) on affected 2025 Audi vehicles may encounter issues during vehicle inspections or exhaust emissions tests. The primary symptom is the inability to complete the diagnostic routine. A diagnostic unit may display a message indicating that it has received incomplete data from the vehicle. This behavior is specific to generic scan tools and does not typically occur when using Audi's proprietary diagnostic system, ODIS.

Fault Codes / DTCs

Audi TSB 2078765/1 explicitly states that there are no Diagnostic Trouble Codes (DTCs) logged in connection with this complaint. Furthermore, no warning messages are displayed in the vehicle's instrument cluster related to this condition. This reinforces that the issue is not a vehicle malfunction but rather a communication anomaly with third-party diagnostic equipment.

Diagnosis and Trigger Conditions

The root cause of the 2025 Audi Q8 generic scan tool errors is an incomplete response from the vehicle's on-board diagnostic interface (Data Bus OBD Interface) to a diagnostic query from a generic scan tool. While a connection to the OBD interface is established, a portion of the query receives an incorrect response, leading the diagnostic tester to display a cancellation message. This issue is described as occurring very occasionally and is typically not reproducible in a workshop setting if the vehicle has undergone a bus sleep cycle.

This specific behavior is remedied by a bus sleep cycle, which occurs after the ignition is switched off and the vehicle remains undisturbed for several minutes. After this cycle, a subsequent query via the on-board diagnostic interface will typically receive a correct response. The TSB identifies the control unit involved as the "0019 - Data Bus OBD Interface" with software part numbers such as 85C*.907.468.AF and 85F*.907.468.F*.

Important Warnings and Warranty Information

Audi Technical Service Bulletin 2078765/1 contains a critical warning for owners and technicians: "This concern is due to a third-party system and is not covered by any Audi Warranty." This means that any diagnostic time or costs incurred due to these generic scan tool errors will not be covered under Audi's standard warranty. Owners should be aware that if a generic scan tool indicates this issue, it is not a defect in their Audi vehicle that requires warranty repair.

Repair Procedure Summary

No specific repair procedure is outlined in Audi TSB 2078765/1 because the issue is not considered a vehicle fault. The bulletin clarifies that if the system behavior is not currently active, no measures are possible. The problem, which manifests as 2025 Audi Q8 generic scan tool errors, is self-correcting. After the vehicle undergoes a bus sleep cycle—typically by turning off the ignition and waiting for approximately five minutes—the on-board diagnostic interface will provide a correct response to subsequent generic scan tool queries. Therefore, no parts replacement or software update is required to address this condition.

Owner Action

If you own a 2025 Audi Q8, SQ8, A7, S6, S7, A6 allroad, A6, S8, Q7, or SQ7 and experience generic scan tool errors, it's important to understand the information provided in Audi TSB 2078765/1. The issue is generally temporary and resolves itself after the vehicle completes a bus sleep cycle. You do not need to take your vehicle to an Audi dealer for this specific concern, as it is not a vehicle defect and is not covered under warranty. If you are using a generic scan tool and encounter the message "A message may be shown indicating that the diagnostic unit has received incomplete data from the vehicle," simply allow the vehicle to enter a bus sleep state (turn off the ignition and wait a few minutes) before attempting another scan.

NHTSA ID: 11025247