2025 Audi A5/S5/Q5/SQ5 P064F00 Unauthorized Software TSB

Audi Technical Service Bulletin (TSB) 2078914/3 addresses a specific issue affecting certain 2025 Audi A5, S5, Q5, and SQ5 models. This bulletin, released on December 8, 2025, details a condition where the Malfunction Indicator Lamp (MIL) illuminates and the engine may fail to start due to unauthorized software or coding detected in the Engine Control Module (ECM).

Revision History

This Technical Service Bulletin has undergone several revisions to ensure accuracy and expand its scope:

• Revision 3 (Date not specified): The header was revised, models were added, control units were updated, the condition description was revised to include the model table, and the service section verbiage was updated.
• Revision 2 (October 15, 2025): The header was revised, and additional models were included.
• Revision 1 (August 7, 2025): This was the initial publication of the bulletin.

Symptoms

Owners of affected 2025 Audi A5, S5, Q5, and SQ5 vehicles may experience specific symptoms, particularly when diagnostic work is performed in a workshop setting. These include:

• The vehicle's engine may not start.
• The Malfunction Indicator Lamp (MIL) or "Exhaust emission warning lamp is on" message may illuminate on the dashboard.

Fault Codes / DTCs

When diagnosing the issue, workshops have identified a specific Diagnostic Trouble Code (DTC) stored in the Engine Control Module (ECM), also known as J623 (address word 0001). This code is central to the problem described in TSB 2078914/3.

Code	Description	Error Type	Symptom	Status
P064F00	Unauthorized Software/Calibration Detected	active/static	10529	10100111

This P064F00 code indicates that the ECM has detected unauthorized software or calibration, which can lead to the symptoms observed, such as the "Engine does not start" condition or the illuminated MIL.

Technical Background

Audi has determined that the coding for the engine control unit (ECM) may become lost during routine ODIS diagnostic procedures conducted in a workshop. The precise root cause of this coding loss is currently under analysis by the manufacturer. This loss of coding is what triggers the "Unauthorized software/coding detected" fault, specifically the Audi A5 P064F00 error. The bulletin notes that a production solution is currently not applicable, indicating that the issue is addressed through a service procedure.

Repair Procedure Summary

To address the Audi A5 P064F00 issue, technicians are directed to consult Audi Technical Service Bulletin (TSB) 2079690. This separate bulletin details a combined software update, specifically version "00 Combined software update 03.10.00/C (28.13.01) KD2". The recommended action is to check if this particular software update is applicable and visible for the affected vehicle. If it is, the software update described in TSB 2079690 must be performed to correct the ECM coding and resolve the P064F00 fault. The current TSB 2078914/3 acts as a reference to the specific software update required.

Affected Components and Software

This issue primarily involves the Engine Control Module (ECM), identified as J623. The bulletin references specific hardware and software identifiers related to this component and the diagnostic process:

• Hardware Part Numbers: 06M907309N, 8B3907559B
• Hardware Version Number: H80
• Software Version Number: 0006
• Production Date: 16.01.2025
• Coding: 08 25 00 02 60 02 01 06 00 00 00 00 00 00 00 00 00 00 00 00 00 00, +, 000000000000000000000000000000000000000000000000
• Ability to Flash: Unknown
• System Name: V6 3.01 TFSI
• ASAM Base Version: BV_EnginContrModul1UDS
• ASAM 2D/ODX Data Set: EV_ECM30TFS011883907559B
• ASAM 2D/ODX Data Set Version: 001007
• Target Data Container: 06M909102BK
• Version of Target Data Container: 0005
• Equipment Code: 00 00 00 00 00 00 00 00
• System Abbreviation: J623

Important Owner Information

Owners should be aware of specific conditions related to this Technical Service Bulletin 2078914/3 and the associated repair:

• Warranty Coverage: If your vehicle is outside of any warranty, this Technical Service Bulletin is for informational purposes only, meaning repair costs may not be covered by Audi. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review and audit by Audi Warranty.
• Software Update Billing: When performing the combined software update, time stamps are not required for billing under warranty. Furthermore, technicians are permitted to work on other vehicles at the same time, and the combined software update can even be performed by non-productive personnel.
• Part and Service References: All part and service references provided in this TSB (2078914) are subject to change and/or removal. Always verify the latest information and parts bulletins with your Parts Department and/or ETKA. Additionally, technicians should consult the Repair Manual for any specific fasteners, bolts, nuts, and screws that require replacement during the repair.

Warranty Claim Details

For authorized Audi service centers, the following details are provided for warranty claims related to this issue:

• Claim Comment: As per TSB 2078914/3
• Service Number: 2470
• Damage Code: 0055
• Labor Operations:
  • GFF (0150 0060): Time stated on the diagnostic protocol
  • GFF (0150 0010): See SRT with associated operations

NHTSA ID: 11027334