2025 Audi A5/Q5/S5/SQ5 Instrument Cluster Messages TSB

Owners of 2025 Audi A5, S5, Q5, and SQ5 vehicles may encounter various warning messages displayed in the instrument cluster. These 2025 Audi A5 instrument cluster messages are often accompanied by specific diagnostic trouble codes (DTCs) related to communication issues within the vehicle's electronic systems. Audi Technical Service Bulletin (TSB) 2078345/1 provides information regarding these concerns.

Symptoms

Customers may observe a range of warning messages appearing in their instrument cluster. These can include:

• "Drive system: fault. Limited performance. Please contact workshop."
• "Loose wheel warning: fault. See owner's manual."
• "Tire pressure: fault. See owner's manual."
• "Initializing active front assist. Please wait..."
• "Brakes: Function restricted. You can continue driving cautiously. Please contact workshop."

Fault Codes / DTCs

When these symptoms occur, a workshop diagnosis may reveal specific diagnostic trouble codes stored in the Engine electronics (J623) control unit. The primary DTCs identified in TSB 2078345/1 are:

Code	Description	Module	Condition
U02AB00	Thermal management control unit – no communication	Engine electronics J623	Active/static
U042200	Invalid Data Received From Body Control Module	Engine electronics J623	Active/static

Diagnosis and Technical Background

The root cause of these 2025 Audi A5 instrument cluster messages and DTCs is a software issue within the onboard supply control unit J519. This software anomaly can lead to the Thermal management module (address word 00C5) not being identified in the GFF LOG. Additionally, it may not be possible to reach address word 8132, indicating a communication problem within the vehicle's network.

Important Warnings for Owners

Audi has provided critical guidance for vehicles experiencing these issues under TSB 2078345/1:

• Do not replace any components for this condition. Replacing parts will not resolve the customer's concern, as the issue stems from a software problem.
• No repairs are necessary at this point. A solution is currently under development and is expected to be available by the end of the 3rd quarter of 2025. Your Audi dealer will explain this timeline, which is subject to change.

Service Procedure and Warranty Information

For affected vehicles, the service procedure involves diagnosing the vehicle according to the instructions in the PSS TSB. If the vehicle's condition matches the technical background, the customer should be informed that a solution is anticipated by the end of Q3 2025 and that no immediate repairs are required.

Workshops are instructed to create a PSS record in the PSS application via the Pending Service Solutions (PSS) link in AccessAudi. For vehicles still in the new model launch phase, a TAC case must be created per repair authorization, referencing TSB 2078345/1 in the first line of the TAC case.

This Technical Service Bulletin (TSB 2078345/1) is informational only if the vehicle is outside of any warranty. Warranty claims must adhere to the Audi Warranty Policies and Procedures Manual. The specific warranty details are:

• Service Number: 9710
• Damage Code: 0039
• Labor Operations:
  • GFF / Guided functions: 0150 0010 (See SRT with associated operations)
  • GFF / Guided functions: 0150 0060 (Time stated on the diagnostic protocol)
  • Loosen and secure earth strap: 9785 0999 (20 TU)
• Claim Comment: As per TSB 2078345/1

Production Solution

Audi is actively working on a production solution for this software issue. The 97 PSS bulletin will be updated once more information and a definitive fix are available. A solution is currently under development.

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Source: NHTSA ID: 11020359