2025 Audi A5/Q5/S5/SQ5 Tire Pressure Warning TSB

Audi has issued Technical Service Bulletin (TSB) 2077226/5 to address instances where a 'Tire pressure/loose wheel warning' is displayed in certain 2025 Audi vehicles. This bulletin provides guidance for technicians on diagnosing and resolving the underlying causes of this warning message. The information is relevant for owners experiencing a 2025 Audi A5 tire pressure warning or similar messages in other affected models.

Revision History

TSB 2077226/5 has undergone several revisions to refine its guidance and scope:

• Revision 5: This revision updated the condition description by adding a model table and revised the warranty information.
• Revision 4 (October 17, 2025): The header was revised to update the model year, service information, and warranty table.
• Revision 3 (July 22, 2025): This revision updated the header to reflect changes in models and included a statement regarding launch vehicles in the service section.

Symptoms

Owners of affected 2025 Audi A5, S5 (FU), A6 Sportback e-tron, S6 Sportback e-tron (GH), Q5, Q5 Sportback, SQ5, SQ5 Sportback (GU), Q6 e-tron, Q6 Sportback e-tron, SQ6 e-tron, and SQ6 Sportback e-tron (GF) vehicles may observe an active 'loose wheel or tire pressure warning'. This primary warning message may also appear in combination with other messages on the instrument cluster. If you are seeing a 2025 Audi A5 tire pressure warning, this TSB provides the necessary diagnostic and repair steps.

Fault Codes / DTCs

When a 'Tire pressure/loose wheel warning' is active, workshop findings indicate that various Diagnostic Trouble Codes (DTCs) may be logged in the vehicle's control units. Technicians are specifically advised to check control unit addresses 812C, 0003, and 0065 (if available) for relevant DTCs. While specific DTC codes with descriptions are not listed in this TSB, their presence at these addresses indicates a potential issue related to the warning. Additionally, DTCs in other control units should be examined, and reference should be made to TSB 2078345 for potential related issues that could trigger the 'loose wheel warning'.

Diagnosis and Repair Procedure

The primary approach for resolving a 2025 Audi A5 tire pressure warning or similar issue begins with checking for an existing software update. Technicians should first determine if TSB 2079690, which details the "00 Combined software update 03.10.00/C (28.13.01) KD2," is applicable to the vehicle. If it is, performing this software update as described in TSB 2079690 is the initial recommended step.

If TSB 2079690 is not available, or if the 'Tire pressure/loose wheel warning' persists after the update, further diagnostic steps are necessary. These steps are crucial for narrowing down the cause of the complaint when the initial software update does not resolve the issue:

1. Software Update: Update the vehicle to the latest software version. This may involve performing other campaigns or TSBs that address software-related issues.
2. DTC Check: Check control unit addresses 812C, 0003, and 0065 (if available) for any relevant DTCs. These addresses are critical for tire pressure monitoring and wheel-related functions.
3. Wheel Balancing and Swapping: If DTCs have been logged for individual wheels or all four wheels, performing wheel balancing or swapping wheels over may help to identify or resolve the issue. This can rule out physical wheel-related problems.
4. Sensor Inspection: Check that the speed sensors and sensor rings for the affected wheel(s) are clean and functioning correctly. Contamination or damage to these components can directly impact the accuracy of tire pressure and wheel rotation readings.
5. Guided Fault Finding: If there are problems with the availability of the system, issues within the vehicle should be corrected according to the Guided Fault Finding process. This systematic diagnostic approach helps pinpoint complex system faults.
6. Control Unit Functionality: Always ensure that control unit addresses 812C and 0003 are functioning correctly, as they are integral to the system's operation.
7. Cross-Reference DTCs: Check DTCs in other control units and consult specific further TSBs, such as TSB 2078345. These may reveal other underlying causes of issues with the 'loose wheel warning' in terms of the chain of effects or based on a message in the instrument cluster.
8. Root Cause Rectification: It is important to remember that 'loose wheel warning' and 'tire pressure messages' can often be symptoms of other underlying issues within the vehicle. Therefore, the primary cause of the complaint should always be rectified first to ensure a lasting repair.

Important Warnings

Owners and technicians should be aware of specific conditions related to this TSB:

• Billing for Labor Time: This TSB number (2077226/5) cannot be used for billing labor time. This implies that the diagnostic and repair work outlined here may need to be billed under a different service campaign or warranty claim process, or it may be considered part of a larger repair. Technicians must consult Audi's warranty guidelines for proper claim submission.
• Warranty Status: If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only. This means Audi will not cover the costs associated with the diagnosis and repair if the vehicle is no longer under its original or extended warranty period.

Warranty Information

For vehicles under warranty, claims related to this TSB must adhere to the Audi Warranty Policies and Procedures Manual. The specific details for warranty claims are as follows:

• Claim Type: If the vehicle is within its warranty period, the issue is considered to be within warranty. If the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.
• Service Number: 4545
• Damage Code: KD02
• Labor Operations:
  • 0151 0010: This operation covers software updates, including the necessary step of connecting a battery charger. Technicians should refer to the Service Repair Time (SRT) system for associated operations and accurate time allocation.
  • 0151 0040: This is a fixed rate operation for software updates. It includes all required preliminary and follow-up work, such as bus sleep cycles, calibration drives, additional work, and restarting the software update if flashing is aborted. This operation accounts for 130 Time Units (TU), which is a standard measure for labor time.

When performing a combined software update, time stamps are not required for warranty billing. This flexibility allows technicians to work on other vehicles simultaneously, optimizing workshop efficiency. Furthermore, this combined update can also be performed by non-productive personnel, indicating that specialized diagnostic technicians are not always required for this specific task.

Additional Information

All part and service references provided in this TSB (2077226) are subject to change and/or removal. Technicians are advised to always check with their Parts Department and/or ETKA (Electronic Parts Catalog) for the latest information and parts bulletins. Additionally, the Repair Manual should be consulted for fasteners, bolts, nuts, and screws that require replacement during the repair process to ensure proper reassembly and safety.

NHTSA ID: 11026219