2021 Mercedes-Benz AMG GT Parking Assist Faults TSB

Mercedes-Benz has released Technical Service Bulletin (TSB) L154.65-P-080132, Version 4, dated February 27, 2026, to address various parking assist system concerns in the 2021 Mercedes-Benz AMG GT. This TSB, which includes a nomenclature update, provides guidance for diagnosing issues related to the PARK213, PARK213M, and PARK223 control units.

Owners of affected vehicles may experience an AMG GT parking assist fault that manifests in several ways, often involving warning messages or unexpected system behavior. The TSB highlights common complaints and symptoms to help technicians accurately diagnose the underlying cause of the AMG GT parking assist fault.

Symptoms

Owners may observe a range of symptoms indicating an AMG GT parking assist fault, including:

• One or More PARK Sensor Activations: Parking sensors may activate without an obvious obstruction.
• "Red Ring Around Vehicle" Display: A visual warning of a "Red Ring Around Vehicle" may appear on the instrument cluster.
• "Active Parking and Parking Assist Inoperative" Message: The instrument cluster may display the message "Active Parking and Parking Assist Inoperative".
• Camera-related issues: Problems with the vehicle's cameras contributing to parking assist malfunction.
• PARKTRONIC Display Malfunctions: This can include issues with the front left display, general display malfunctions, or all displays malfunctioning simultaneously.
• Acoustic Warning Malfunctions: The audible parking assist warnings may not function correctly or at all.
• Automatic Shutoff: The parking assist function may automatically shut off unexpectedly.
• Operation Without Obvious Cause: The system may operate or malfunction without any clear external trigger.

Cause

The TSB indicates that these parking assist system issues can arise from various root causes. The complexity of modern vehicle electronics means that a single symptom can often be traced back to multiple potential failures within the system.

Diagnosis and Remedy

To address an AMG GT parking assist fault, Mercedes-Benz directs technicians to consult the attached diagnostic guide, titled "Park System Diagnostic Guide 213_213M_223.pdf". This comprehensive guide provides the necessary steps and procedures for thorough diagnosis and proper repair of the parking assist system. The TSB itself serves as a reference point, directing service personnel to the detailed instructions contained within the diagnostic document.

Important Warnings for Owners and Technicians

Mercedes-Benz emphasizes that this document is intended for use by trained, professional technicians who possess the knowledge and tools required for proper diagnosis and repair. It is crucial to understand the following:

• No Warranty Guarantee: The information provided in this TSB does not guarantee warranty coverage, nor does it extend the vehicle's warranty in any way.
• No Implied Defect: The TSB does not indicate that a defect is present in any vehicle referenced, nor does it imply warranty coverage.
• Professional Diagnosis Required: Technicians must use their diagnostic skills and make evaluations on a case-by-case basis. A described symptom or condition, or its cause, does not automatically mean it affects all vehicles or that a described repair applies universally.
• Multiple Causes for Symptoms: Similar symptoms can have various root causes, necessitating careful and professional service.

Owners should be aware that a proper diagnosis by a qualified Mercedes-Benz technician is essential to correctly identify and resolve any parking assist system issues.

NHTSA ID: 11029093