2025 Audi A5/Q5 Driver Assist System Fault U110100 TSB

Symptoms

Owners of affected 2025 Audi A5, S5, Q5, and SQ5 vehicles may observe various messages displayed on their instrument cluster related to the driver assist systems. These messages indicate a malfunction within the vehicle's advanced safety and convenience features.

Fault Codes / DTCs

When diagnosing the issue, technicians will find the following entry logged in the event memories of the short-range radars and/or adaptive cruise control units:

• U110100: "Component protection active, active/static, symptom: 1231633"

This fault code is specifically associated with diagnostic addresses 8109, 810A, 810B, and 810C for the short-range radars, and 0013 and 008B for the adaptive cruise control units. The root cause is traced back to the onboard supply control unit, identified by diagnostic address 0009.

Technical Background

The underlying cause of the 2025 Audi A5 driver assist system fault U110100 is a software issue within the onboard supply control unit, designated as -J519-. This control unit is responsible for managing various electrical functions, and in this specific scenario, a software glitch prevents the component protection feature in the short-range radars from deactivating as it should. When component protection remains active, it can lead to functional issues within the driver assist systems, triggering the warning messages and the specific DTC U110100.

Component protection is an anti-theft and security feature in Audi vehicles designed to prevent the unauthorized exchange of electronic control units. When a component is replaced, it must be properly adapted to the vehicle. If this adaptation process fails or if there's a software error preventing it, the component protection remains active, rendering the component inoperable or limited in function, as is the case with the short-range radars here.

Repair Procedure Summary

The resolution for the 2025 Audi A5 driver assist system fault U110100 involves performing a software update. This update targets the onboard supply control unit -J519- to correct the software logic that is preventing the deactivation of component protection in the short-range radars. During this process, a battery charger must be connected to the vehicle to maintain stable voltage throughout the software flashing procedure. Technicians should also check for the visibility of TSB 2079690, which describes a combined software update, and perform it if applicable. The software update typically involves using specialized diagnostic tools to flash the new software version onto the control unit, followed by any necessary recalibration of the affected driver assist systems.

Warranty Information

This Technical Service Bulletin (TSB 2079729/3) is primarily informational if the vehicle is outside of its warranty period. For vehicles still under warranty, Audi provides specific labor operations for the repair. The Service Number for this operation is 9710, with a Damage Code of KD02. Labor operations include code 01510010 for the software update with battery charger connection, and 01510040 for a fixed rate covering all required preliminary and follow-up work, including bus sleep cycle, calibration drive, and restarting the software update if flashing is aborted, estimated at 130 time units (TU). An additional 50 TU (code 01509999) may be claimed for subsequent attempts if a flash cancellation occurs. All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual. Notably, when performing a combined software update, time stamps are not required for billing under warranty, allowing technicians flexibility.

Important Warnings

Owners should be aware that if their vehicle is no longer covered by warranty, this Technical Service Bulletin is considered informational only. This implies that the cost of diagnosis and repair may not be covered by Audi. It is always advisable to consult with an authorized Audi service center to understand the warranty status of your vehicle and the potential costs involved.

Owner Action

If your 2025 Audi A5, S5, Q5, or SQ5 is exhibiting various driver assist system messages or has logged the 2025 Audi A5 driver assist system fault U110100, it is recommended to schedule an appointment with an authorized Audi service center. The necessary repair is a software update that addresses the underlying issue in the onboard supply control unit. This TSB (2079729/3) supersedes the previous Pending Service Solution (PSS) TSB 2078209 and references TSB 2079690 for a combined software update.

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Source: NHTSA ID: 11027390