2021 Mercedes-Benz AMG GT Parking Assist Malfunction TSB

Owners of the 2021 Mercedes-Benz AMG GT may experience various issues with their vehicle's parking assist system. Mercedes-Benz has released Technical Service Bulletin (TSB) L154.65-P-080132, dated December 11, 2025 (Version 1), to provide diagnostic guidance for these problems, which can manifest in several ways, including warning messages and system malfunctions.

This TSB specifically applies to vehicles equipped with PARK213, PARK213M, and PARK223 control units, which are integral to the Mercedes-Benz AMG GT parking assist system. The document outlines common complaints and directs technicians to a detailed diagnostic guide for proper resolution.

Symptoms of Parking System Malfunction

Owners might notice a range of symptoms related to the parking assist system. These can include:

• One or More PARK Sensor Activations: Parking sensors activating without an apparent obstacle or input.
• Red Ring Around Vehicle: A visual warning appearing as a "Red Ring Around Vehicle" on the display.
• Instrument Cluster Message: The specific warning message "Active Parking and Parking Assist Inoperative" displayed in the instrument cluster.
• Camera Issues: Malfunctions related to the vehicle's cameras used for parking assistance.
• Display Malfunctions: Problems with the parking assist displays, such as:
  • Malfunction of displays, specifically the front left display.
  • General malfunction of displays.
  • All displays malfunctioning simultaneously.
  • Displays operating without obvious cause.
• Acoustic Warning Malfunction: General issues with the audible warnings from the PARKTRONIC system, or acoustic warnings operating without obvious cause.
• Automatic Shutoff: The parking assist function automatically shutting off.

These symptoms indicate a need for diagnosis of the Mercedes-Benz AMG GT parking assist system.

Cause of Malfunctions

The TSB states that these parking system malfunctions can stem from various root causes. Due to the complexity of modern vehicle electronics, pinpointing the exact issue requires a comprehensive diagnostic process by trained professionals.

Important Warnings for Owners

Mercedes-Benz includes critical disclaimers in this TSB that owners should be aware of:

• No Guarantee of Defect: The information provided does not indicate that a defect is present in any vehicle or imply warranty coverage.
• Varied Causes and Repairs: "DO NOT assume that a symptom or condition... affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles." There can be multiple causes for similar symptoms.
• Warranty Coverage Not Guaranteed: "The information contained in this document does not guarantee warranty coverage nor does it extend the vehicle's warranty in any way."

Diagnosis and Remedy

This TSB serves as an overview and directs technicians to a separate, detailed document titled "Park System Diagnostic Guide 213_213M_223.pdf" for the actual remedy. This attached diagnostic guide contains the specific steps and procedures required to properly diagnose and repair the various parking assist malfunctions. Therefore, the exact repair procedure will depend on the specific findings from the diagnostic guide.

There are no specific operation numbers or damage codes listed within this TSB itself for warranty claims; these details would typically be found in the comprehensive diagnostic guide or related service information.

Next Steps for Owners

If your 2021 Mercedes-Benz AMG GT is exhibiting any of the described Mercedes-Benz AMG GT parking assist symptoms, it is recommended to schedule an appointment with an authorized Mercedes-Benz dealership. Their technicians have access to the detailed diagnostic guide and approved tools necessary to accurately identify the root cause and perform the appropriate repairs. Be prepared to discuss the symptoms you are experiencing in detail.

NHTSA ID: 10229864