2025-2026 Audi A5/Q5 Tire Pressure/Loose Wheel Warning TSB

Symptoms

Owners of affected Audi vehicles may observe a persistent warning message on their instrument cluster, specifically "Tire pressure/loose wheel warning shown". This critical alert indicates that either a tire pressure issue or a potentially loose wheel condition has been detected. The message "loose wheel or tire pressure warning is active" may appear alone or in conjunction with other messages, prompting immediate attention.

Diagnosis / Trigger Conditions

When an Audi A5 tire pressure loose wheel warning is reported by a customer, workshop findings indicate that the complaint can be reproduced, and various Diagnostic Trouble Codes (DTCs) may be logged in the vehicle's control units. The initial and primary diagnostic step, as outlined in this Technical Service Bulletin 2077226/6, is to perform the software update detailed in TSB 2079690, which is titled "00 Combined software update 03.10.00/C (28.13.01) KD2." This update is crucial for addressing potential software-related causes of the warning.

If the software update from TSB 2079690 is not yet available, or if the "Tire pressure/loose wheel warning shown" message persists after the update, a more comprehensive diagnostic procedure is required. Technicians should follow these steps to narrow down the cause of the Audi A5 tire pressure loose wheel warning:

• First, update the vehicle to the latest available software version, which may involve performing other campaigns or TSBs.
• Next, check control unit addresses 812C and 0003, and 0065 (if available) for any relevant DTCs that could indicate a specific fault.
• If DTCs have been logged for individual wheels or all four wheels, performing wheel balancing or swapping wheels over may help to resolve the issue.
• It is also important to check that the speed sensors and sensor rings for the affected wheel are clean and working correctly, as these components are vital for tire pressure monitoring.
• Should there be problems with the availability of the system, the issues in the vehicle should be corrected according to Guided Fault Finding procedures.
• Always verify that control unit addresses 812C and 0003 are functioning correctly, as their proper operation is critical for the system.
• Finally, check for DTCs in other control units and consult specific further TSBs, such as TSB 2078345, which may identify possible causes of issues related to the loose wheel warning in terms of the chain of effects or based on a message in the instrument cluster.

It is critical to understand that the "loose wheel warning and tire pressure messages are often a result of other issues with the vehicle." Therefore, the main underlying cause must be identified and rectified first to properly address the Audi A5 tire pressure loose wheel warning.

Repair Procedure Summary

The core repair strategy for the "Tire pressure/loose wheel warning shown" message, as per Technical Service Bulletin 2077226/6, begins with performing a comprehensive software update. This update is specifically outlined in TSB 2079690, titled "00 Combined software update 03.10.00/C (28.13.01) KD2." This initial step aims to resolve any software-related anomalies that might be triggering the warning.

Should the software update not fully resolve the Audi A5 tire pressure loose wheel warning, or if TSB 2079690 is not yet accessible, technicians are directed to proceed with a detailed diagnostic process. This involves systematically checking various vehicle systems and components. Key steps include examining control unit addresses 812C, 0003, and 0065 for any stored Diagnostic Trouble Codes (DTCs). Technicians will also inspect physical components such as the speed sensors and their corresponding sensor rings on the affected wheels, ensuring they are clean and operating correctly. In cases where DTCs are present for specific wheels, wheel balancing or swapping might be performed. Furthermore, any system availability problems are to be addressed using Guided Fault Finding, and other relevant TSBs, such as 2078345, should be consulted for additional diagnostic insights. The overarching principle is to identify and rectify the fundamental cause of the warning, rather than merely clearing the message.

Important Warnings

Owners and technicians should be aware of several important points regarding this Technical Service Bulletin 2077226/6. First, this specific TSB number, 2077226/6, cannot be used for billing labor time. Labor operations related to this issue are to be billed under the referenced software update and diagnostic procedures. Second, if your vehicle is outside of any applicable warranty, this Technical Service Bulletin is provided for informational purposes only, meaning that associated repair costs would typically be the owner's responsibility. It is crucial to consult with an authorized Audi service center to understand warranty coverage and potential charges.

Warranty Information

For vehicles still covered by warranty, the software update and associated diagnostic work required to resolve the Audi A5 tire pressure loose wheel warning are generally covered. However, if the vehicle is outside of its warranty period, this Technical Service Bulletin serves as informational guidance only, and charges may apply for diagnosis and repair. All warranty claims must strictly adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

The following specific codes are used for warranty claims related to this issue:

• Claim Type: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 4545
• Damage Code: KD02

Labor operations for the software update and related diagnostic work include:

• 0151 0010: Software update, including connecting a battery charger. This operation refers to the Service Repair Time (SRT) with associated operations.
• 0151 0040: Fixed rate for the software update, which covers all required preliminary and follow-up work. This includes tasks such as bus sleep cycle management, calibration drives, and any additional necessary work. This operation is allocated 130 time units (TU).
• 0150 9999: In the event of additional attempts after a flash abort has occurred, an additional lump sum of 50 time units can be claimed per flash cancellation. This is allocated 50 TU per each documented attempt.

The "Claim Comment" for these operations should reference "As per TSB 2077226/5". When performing the combined software update, technicians are not required to log time stamps for warranty billing, allowing them to work on other vehicles concurrently. Furthermore, the combined software update can be performed by non-productive personnel.

Revision History

This Technical Service Bulletin 2077226/6 has undergone several revisions to ensure accuracy and provide the most current information. The revision history is as follows:

• Revision 6 (Current): The header was revised to include additional model years.
• Revision 5 (November 24, 2025): The 'Condition' section was updated with a revised model table, and the 'Warranty' table was also updated.
• Revision 4 (October 17, 2025): The header was revised to include additional model years, the 'Service' information was updated, and the 'Warranty' table was also updated.

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Source: NHTSA ID: 11027402