2025 Audi A5 Instrument Cluster Messages TSB 2079930/2

Revision History

Technical Service Bulletin 2079930/2, released on December 16, 2025, is the second revision of this document. The initial publication (Revision 1) was issued on November 10, 2025. Revision 2 primarily involved a revised header that added a software version filter, refining the applicability of the bulletin.

Symptoms: Various Instrument Cluster Messages

Owners of 2025 Audi A5, S5 (FU), Q5, Q5 Sportback, SQ5, and SQ5 Sportback (GU) models may observe a range of warning messages appearing in their instrument cluster. These messages indicate potential issues with various vehicle systems and can be concerning. The presence of these 2025 Audi A5 instrument cluster messages is the primary symptom addressed by Technical Service Bulletin (TSB) 2079930/2.

Examples of the verbatim warning messages that owners might see 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 in cooling system"

Fault Codes (DTCs)

Upon diagnosis, technicians may find that certain diagnostic addresses are unreachable, specifically 00C5 and potentially 8132. The underlying cause for the 2025 Audi A5 instrument cluster messages is often linked to specific Diagnostic Trouble Codes (DTCs) stored in the vehicle's control units. These codes indicate communication issues or invalid data reception.

The following DTCs may be stored in the Engine electronics, J623 (address word 0001):

Code	Description	Condition
U02AB00	Thermal management control unit – no communication	Active/Static
U042200	Invalid data received from body control module	Active/Static

Additionally, for vehicles equipped with 2.0L TFSI engines (engine codes DWZA, DWZB, or DXCA), the following DTC may also be logged:

Code	Description	Condition
P021700	Engine Coolant Over Temperature Condition – symptom 47156	Active/Static

Technical Background

Audi has identified the root cause of these various instrument cluster warnings and associated DTCs as a software issue within the onboard supply control unit, designated as J519. This software anomaly can lead to communication failures between critical vehicle modules, resulting in the display of erroneous or critical warning messages to the driver. This issue can prevent diagnostic addresses 00C5 and 8132 from being reached, further complicating diagnosis without the proper procedure.

Repair Procedure Summary

Technical Service Bulletin 2079930/2 outlines a two-step repair process to address the software issue and resolve the 2025 Audi A5 instrument cluster messages. This TSB replaces previous bulletins, specifically Pending Service Solution TSB 2078345 and 97 PSS, which also dealt with instrument cluster messages and unreachable diagnostic addresses.

1. Perform a Terminal 30 Reset: The first step involves performing a terminal 30 reset for a minimum of 15 minutes. This procedure helps to clear temporary electrical states and can restore communication with diagnostic addresses 00C5 and 8132. This step is crucial before proceeding with any software updates.

2. Check for and Apply Software Update: After the terminal 30 reset, technicians must check if TSB 2079690, titled "00 Combined software update 03.10.00/C (28.13.01) KD2," is applicable and visible for the specific vehicle. If this TSB is applicable, the software update detailed within TSB 2079690 must be performed. This update is crucial for correcting the underlying software fault in the J519 onboard supply control unit, which is the root cause of the communication errors and subsequent instrument cluster warnings.

Warranty Information

This Technical Service Bulletin 2079930/2 provides guidance for repairs. If the vehicle is outside of any warranty, this bulletin serves as informational guidance only, meaning the repair costs may not be covered by Audi. For vehicles under warranty, specific labor operations and time units (TU) are provided for claiming the repair.

• Service Number: 9710
• Damage Code: KD02

Labor Operations for Terminal 30 Reset Only (for vehicles where TSB 2079690 is not yet visible):

Operation	Code	Time Units (TU)	Notes
GFF / Guided Functions	0150 0010	See SRT	With associated operations
GFF / Guided Functions	0150 0060	Time stated on diagnostic protocol
Loosen and secure ground cable	9785 0999	20

Labor Operations for Terminal 30 Reset AND Software Update (for vehicles where TSB 2079690 is already visible):

Operation	Code	Time Units (TU)	Notes
Software update, including connecting battery charger	0151 0010	See SRT	With associated operations
Fixed rate for software update	0151 0040	130	Includes all required preliminary and follow-up work (bus sleep cycle, calibration drive, additional work, and restarting software update if flashing is aborted)
Loosen and secure ground cable	9785 0999	20

Important Notes for Owners and Technicians

When performing the combined software update described in TSB 2079930/2, Audi specifies that 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 also be performed by non-productive personnel. This flexibility aims to streamline the repair process for dealerships.

Source: NHTSA ID 11027380