2025-2026 Audi Main Beam Assist Instrument Cluster Messages TSB

Audi has released Technical Service Bulletin (TSB) 2080876/1 to address specific instrument cluster messages that may appear after the onboard supply control unit (J519, also known as HCP4) has been replaced and set up in certain 2025-2026 Audi models. This TSB was released on February 4, 2026, and applies to a range of vehicles including the A5, S5, Q5, Q5 Sportback, SQ5, SQ5 Sportback (FU/GU) from 2025-2026, and various e-tron models like the A6 Sportback e-tron, S6 Sportback e-tron, Q6 e-tron, Q6 Sportback e-tron, SQ6 e-tron, and SQ6 Sportback e-tron from 2025, as well as the A6 (FN) from 2026.

Symptoms

Owners of affected vehicles may first notice that after the onboard supply control unit J519 (HCP4) has been replaced and set up, "various messages in instrument cluster about main beam assist" appear. The TSB specifies that initially, Diagnostic Trouble Code (DTC) entries related to the basic setting of the headlights are logged in diagnostic address 0009. These initial DTCs can be cleared. However, after the ignition (terminal 15) is switched off and on again, persistent "faults regarding the main beam assist" and/or "Audi adaptive light are displayed in the instrument cluster." A key detail is that these subsequent, persistent warnings do not result in new DTC entries being logged again in diagnostic address 0009. If you are experiencing these types of warnings, such as an "Audi A6 main beam assist" message, this TSB provides the solution.

Fault Codes / DTCs

This Technical Service Bulletin (TSB 2080876/1) clarifies the behavior of Diagnostic Trouble Codes (DTCs) related to this issue. Immediately after the replacement and setup of the onboard supply control unit J519 (HCP4), DTC entries concerning the basic setting of the headlights are logged in diagnostic address 0009. The TSB indicates that these initial DTCs can be successfully deleted. However, the subsequent and persistent instrument cluster messages, such as those indicating "faults regarding the main beam assist" or "Audi adaptive light are displayed in the instrument cluster," do not generate new DTC entries in diagnostic address 0009. Therefore, technicians might not find active DTCs corresponding to the visible instrument cluster warnings after the initial clearing.

Diagnosis / Trigger Conditions

The core technical reason for these instrument cluster messages is that the basic setting of the headlights is not automatically triggered during the initial setup process of the new onboard supply control unit (HCP4). This omission prevents the main beam assist and adaptive light systems from properly calibrating, leading to the warning messages displayed to the driver. The system expects this basic setting to occur, and its absence causes the system to report a fault condition.

Repair Procedure Summary

To rectify the issue and clear the persistent instrument cluster warnings, the service procedure outlined in TSB 2080876/1 involves performing a specific calibration. Technicians must execute the "Basic setting of headlamps" program. This program is accessible through the vehicle's diagnostic system, specifically via the Guided Functions/Guided Fault Finding interface. This step ensures that the headlights are correctly calibrated and configured, allowing the main beam assist and Audi adaptive light systems to function as intended and eliminating the warning messages. No specific part replacements or software updates are mentioned as being required beyond this calibration.

Important Warnings

Audi explicitly states that this Technical Service Bulletin (TSB 2080876/1) is for informational purposes only. It is crucial for owners to understand that this TSB is "not applicable to any Audi Warranty." This means that any diagnostic work or repair performed to address the instrument cluster messages described in this bulletin, including the "Basic setting of headlamps" procedure, may not be covered under your vehicle's factory warranty or extended service plans. Owners should be prepared for potential out-of-pocket expenses. Furthermore, Audi advises technicians to always check with their Parts Department and/or ETKA for the latest information and parts bulletins, and to consult the Repair Manual for details on fasteners, bolts, nuts, and screws that require replacement during any related repair. This highlights the importance of using up-to-date resources for accurate service.

Owner Action

If your 2025-2026 Audi A5, S5, Q5, SQ5, A6, S6, or Q6 is displaying persistent instrument cluster messages such as "faults regarding the main beam assist" or "Audi adaptive light are displayed in the instrument cluster" after a recent replacement of the onboard supply control unit (J519/HCP4), you should contact your authorized Audi service center. Inform them about Technical Service Bulletin 2080876/1. The service center will need to perform the "Basic setting of headlamps" program using their diagnostic tools. Be aware that, as per the TSB's explicit warning, this service is "not applicable to any Audi Warranty," meaning you may be responsible for the cost of the repair. Discuss potential costs with your service advisor before proceeding.

Source: NHTSA ID: 11029414, Transaction No.: 2080876/1