2025 Audi A5/S5/A6/S6 Adaptive Cruise Control Unavailable TSB

Owners of certain 2025 Audi A5, S5, A6 Sportback e-tron, and S6 Sportback e-tron models may encounter a warning message in their instrument cluster indicating that the adaptive cruise control or adaptive cruise assist system is currently unavailable. This issue, documented under Audi Technical Service Bulletin (TSB) 2080350/1, points to specific conditions that can lead to these warnings and outlines the steps for diagnosis and resolution.

This Pending Service Solution (PSS) is particularly relevant for vehicles that have received a KD2 software update or are experiencing issues with the exterior door handle sensors. The TSB provides guidance for technicians to address the underlying causes, ensuring the proper functionality of the 2025 Audi A5 adaptive cruise control system.

Symptoms

Owners will typically observe one of the following messages displayed in the instrument cluster:

• "Adaptive cruise control: currently unavailable. See owner's manual"
• "Adaptive cruise assist: currently unavailable. Door open"

These messages indicate a malfunction within the vehicle's driver assistance systems, specifically affecting the 2025 Audi A5 adaptive cruise control and assist features.

Fault Codes / DTCs

When these symptoms occur, workshop findings often reveal one or more event memory entries logged in diagnostic address 0013 as static or intermittent. The primary diagnostic trouble code (DTC) associated with this issue is U112200, which signifies a "Data bus implausible message." This DTC is further specified by symptom numbers that pinpoint the affected door:

Symptom number	Affected door	Diagnostic address
16776924	Rear passenger side door	00BC
16776925	Rear driver side door	00BB
16776926	Front passenger side door	0052
16776927	Driver side door	0042

Diagnosis and Trigger Conditions

Audi has identified two primary scenarios that lead to these warning messages and the U112200 DTC:

Scenario 1: Post-Software Update Initialization

This scenario occurs after a combined software update to KD2 has been performed. If, following the update, all doors were not opened and closed once as specified in the instructions to initialize the adaptive cruise assist system, the system may remain unavailable.

Scenario 2: Exterior Door Handle Sensor Software Issue

This scenario points to a software issue within the exterior door handle sensor itself. This is a known concern for which Audi is currently developing a sustainable solution. These scenarios directly impact the functionality of the 2025 Audi A5 adaptive cruise control system.

To diagnose the specific cause, technicians will perform a detailed diagnostic procedure. First, they will run a test plan to "Read/erase event memory" in the door control unit for the affected door(s) using Guided Fault Finding (GFF). The specific GFF path to access this function is "Door electronics 0042 / 0052 / 00BB / 00BC -> Functions." After running this test, technicians will upload and check the diagnostic log to determine whether the entry "Sensor for exterior door handle - no communication" was recorded under the respective function test. This entry helps confirm if the issue stems from the door handle sensor.

Repair Procedure Summary

The repair approach depends on the identified scenario, as outlined in Audi TSB 2080350/1:

For Scenario 1 (Doors Not Cycled After KD2 Update)

If the diagnostic log does not show the "Sensor for exterior door handle - no communication" entry, and the issue is attributed to the doors not being opened and closed after a KD2 software update, the resolution is straightforward. Technicians should simply instruct the customer to open and close all vehicle doors once. This action will re-initialize the adaptive cruise assist system, and the function will then be restored.

For Scenario 2 (Exterior Door Handle Sensor Software Issue)

If the diagnostic process confirms a software issue in the exterior door handle sensor, a different approach is taken:

1. After diagnosing the vehicle according to the instructions, if the customer's vehicle condition matches the "Technical Background" of this PSS TSB, technicians should explain that a sustainable solution is expected to be available by the end of the first quarter of 2026. It is important to note that this date is subject to change, and no repairs are necessary at this point.
2. Technicians are explicitly instructed not to replace any components for this condition, as doing so will not resolve the customer's concern.
3. A Pending Service Solutions (PSS) record must be created in the PSS database. This is done via the "Pending Service Solutions (PSS)" link found in Audi Now under "Service | AU-US > Pending Service Solutions (PSS)."

The issue related to Scenario 2 can be temporarily remedied by opening and closing the doors, which may restore functionality for a period.

Important Warnings for Owners

Owners should be aware of the following critical information regarding this issue:

• Do not replace components: If your vehicle is experiencing the "Adaptive cruise control: currently unavailable" message due to a software issue in the exterior door handle sensor (Scenario 2), do not replace any components. The manufacturer explicitly states that replacing parts for this condition will not resolve the concern.
• Solution timeline is an estimate: For Scenario 2, a sustainable solution is anticipated by the end of the first quarter of 2026. However, Audi notes that this target date is based on planning and is not binding. Delays or hindrances may occur during validation, technical, and regulatory approval processes. This must be considered when communicating with customers.

Warranty Information

Audi TSB 2080350/1 provides specific guidance on warranty claims for this issue:

Scenario 1

If the fault is due to doors not being cycled after a KD2 update, this condition is generally not covered under warranty. It is not possible to bill for fault finding and/or component replacement under warranty for this specific scenario.

Scenario 2

For the software issue in the exterior door handle sensor, if the vehicle is outside of any warranty, this Technical Service Bulletin is informational only.

The following details apply to warranty claims:

• Service Number: 5711
• Damage Code: 0039
• Labor Operations:
  • GFF / Guided Functions: 0150 0010 (See SRT with associated operations)
  • GFF / Guided Functions: 0150 0060 (Time stated on the diagnostic protocol)
• Claim Comment: As per TSB 2080350/1

All warranty claims must adhere to the Audi Warranty Policies and Procedures Manual and are subject to review or audit by Audi Warranty.

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Source: NHTSA ID 2080350/1