2022-2024 Audi A3/S3/RS 3 3rd Brake Light Warning TSB

If your 2022-2024 Audi A3, S3, or RS 3 is showing a "3rd brake light warning" in the instrument cluster, you're not alone. This issue, which can be identified by diagnostic trouble code (DTC) B12C615, is addressed by NHTSA Manufacturer Communication 10247513. This bulletin provides important information for technicians regarding the proper diagnosis and resolution of this specific fault. Owners searching for "Audi S3 brake light warning" or related issues should be aware of this technical service bulletin.

Symptoms

Owners may observe the following symptom:

• A "3rd brake light warning" message displayed prominently in the vehicle's instrument cluster.

This warning indicates a potential malfunction within the third brake light system, which is crucial for vehicle safety.

Fault Codes / DTCs

When diagnosing this issue, technicians may find the following diagnostic trouble code (DTC):

Code	Description
B12C615	3rd brake light warning in instrument cluster

This specific code points directly to the third brake light system as the source of the problem.

Diagnosis and Trigger Conditions

The "3rd brake light warning" and DTC B12C615 are triggered when the vehicle's electrical system detects an anomaly with the third brake light. This could be due to various factors, including wiring issues, component failure, or other electrical discrepancies. The bulletin provides guidance for technicians to accurately diagnose the root cause of the "Audi S3 brake light warning" and ensure proper repair.

Repair Procedure Summary

NHTSA Manufacturer Communication 10247513 provides information to assist technicians in addressing the "3rd brake light warning" and associated DTC B12C615. While the bulletin itself provides information, the specific repair steps will depend on the diagnosis performed by a qualified Audi technician. This may involve inspecting the wiring, connections, and the third brake light assembly itself to identify and rectify the fault.

Owner Action

If your 2022-2024 Audi A3, S3, or RS 3 displays a "3rd brake light warning," it is recommended to schedule an appointment with an authorized Audi service center. Provide them with details of the warning message and mention the diagnostic trouble code B12C615 if you have retrieved it. The dealer will use NHTSA Manufacturer Communication 10247513 to guide their diagnostic and repair process. Addressing this "Audi S3 brake light warning" promptly ensures your vehicle's safety features are fully functional.

Important Warnings

Audi is not notifying consumers directly about this manufacturer communication. Owners should proactively check for this issue if they experience the symptoms.

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Source: NHTSA ID: 10247513