2025-2026 Audi A5 Driver Assist Systems Not Working TSB

Audi has issued Technical Service Bulletin (TSB) 2079926/2 to address an intermittent issue affecting various driver assist systems in certain 2025-2026 Audi A5, S5, Q5, and SQ5 models. This bulletin provides guidance for technicians on diagnosing and resolving instances where driver assist systems are not consistently available.

The core of the problem, as identified by Audi, is a software issue within the vehicle's cluster. This TSB outlines a specific software update designed to correct the underlying cause of the intermittent malfunctions, ensuring reliable operation of the driver assist features in your Audi. Owners experiencing problems with their Audi A5 driver assist systems should be aware of this bulletin.

Symptoms of Intermittent Driver Assist System Malfunctions

Owners of affected vehicles may experience a specific symptom: "various driver assist systems are sometimes not available." This means that features designed to assist the driver, such as adaptive cruise control, lane keeping assist, or parking aids, might occasionally cease to function or become unavailable during operation. The issue is characterized by its intermittent nature rather than a continuous failure.

Diagnosis and Trigger Conditions

This TSB applies when specific conditions are met during the diagnostic process. Technicians should consider this bulletin if:

• The customer's complaint about the driver assist systems is not permanent, meaning the issue occurs occasionally or has been adequately documented over time.
• All other relevant TSBs related to driver assist systems have been reviewed and found not applicable to the specific vehicle's symptoms.
• Initial fault-finding and diagnosis procedures have yielded no clear results, making it difficult to identify the root cause through standard methods.

Important Warnings for Owners and Technicians

Audi includes a critical notice within TSB 2079926/2 regarding the scope of this software update:

• NOTICE: "This TSB will not solve the problem if the complaint occurs continuously or cannot be remedied by switching the vehicle off and on again or performing a bus sleep cycle. In this case, please continue the diagnosis."

This means that if your vehicle's driver assist systems are always unavailable, or if the issue persists even after restarting the vehicle or allowing it to enter a bus sleep cycle, this particular software update may not be the solution. In such cases, further diagnosis beyond the scope of this TSB would be required to identify a different underlying problem.

Repair Procedure Summary

The resolution for the intermittent Audi A5 driver assist systems issue involves performing a combined software update. The specific software version to be installed is 03.10.00/C (28.13.01) KD2. This update targets the vehicle's cluster, which is responsible for managing various driver assist functions.

Technicians are instructed to connect a battery charger to the vehicle during the software update process to maintain stable voltage and prevent interruptions. For detailed instructions on performing the combined software update, technicians should refer to TSB 2079690. This ensures that the update is carried out correctly and efficiently, addressing the intermittent functionality of the driver assist systems.

Required Tools or Parts

While no specific part numbers are listed for replacement, the repair procedure requires standard diagnostic equipment capable of performing software updates on Audi vehicles. A battery charger is also explicitly mentioned as a necessary tool to ensure power stability during the update process. The software update itself is delivered electronically.

Warranty Information

This TSB provides detailed guidelines for warranty claims related to the software update:

• Claim Type: If the vehicle is outside of its warranty period, this Technical Service Bulletin is for informational purposes only, and the repair may not be covered.
• Service Numbers: Specific service numbers are provided for billing purposes: 9638 for vehicles with PR number GJ0, and 9093 for vehicles with PR number GJ6.
• Damage Code: The designated damage code for this issue is KD02.
• Labor Operations:
  • 0151 0010: Covers the software update procedure, including the connection of a battery charger. This operation is linked to specific time units (TU) detailed in the Service Repair Time (SRT) guide.
  • 0151 0040: Represents a fixed rate for the software update, encompassing all necessary preliminary and follow-up work. This includes procedures like bus sleep cycles and calibration drives, and is allocated 130 TU.
  • 0150 9999: An additional labor operation for claiming 50 TU per documented attempt if a flash abort occurs during the update process.
• Claim Comment: All claims must reference TSB 2079926/2.

Audi also notes that time stamps are not required for billing under warranty when performing this combined software update. This allows technicians to work on other vehicles concurrently, and the update can be performed by non-productive personnel, streamlining the service process.

Owner Action

If you own a 2025-2026 Audi A5, S5, Q5, or SQ5 and are experiencing intermittent issues where "various driver assist systems are sometimes not available," you should contact your authorized Audi dealership. Inform them about the symptoms you are experiencing and mention Technical Service Bulletin (TSB) 2079926/2. The dealership will be able to diagnose the issue and perform the necessary software update to resolve the problem with your Audi A5 driver assist systems.

TSB Revision History

This Technical Service Bulletin has undergone revisions to ensure accuracy and completeness:

• Revision 2 (December 18, 2025): This is the current revision. It includes a revised header with updated models, an expanded condition section with an added model table, and updated labor operations within the warranty section.
• Revision 1 (November 07, 2025): This was the initial publication of the TSB.

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Source: NHTSA ID: 11027415