2011 Mercedes-Benz SL65 AMG

2011 Mercedes-Benz SL65 AMG

Overview

The 2011 Mercedes-Benz SL65 AMG, a high-performance roadster, is renowned for its potent V12 engine and luxurious appointments. While generally built to a high standard, like any complex performance vehicle, it can experience specific issues as it ages. This analysis focuses on documented, non-wear-and-tear related reliability concerns for this model year, providing insights into potential problem areas for owners and enthusiasts. The focus is on components that have shown a propensity for failure beyond typical maintenance cycles, offering a realistic view of its long-term ownership experience.

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Engine

6.0L Twin-Turbo V12 (M275)

Turbocharger Wastegate Actuators

• Symptoms: Reduced engine power, boost pressure issues, check engine light.
• Solution: Replacement of faulty wastegate actuators.
• Cost: $800 - $1500

Intercooler System Leaks

• Symptoms: Overheating, loss of power, rough idle.
• Solution: Repair or replacement of intercooler hoses and components.
• Cost: $500 - $1200

Ignition Coil Failure

• Symptoms: Misfires, rough running, check engine light.
• Solution: Replacement of faulty ignition coils.
• Cost: $300 - $600 per coil

Transmission

5-Speed Automatic (722.6)

Torque Converter Issues

• Symptoms: Slipping, shuddering, delayed engagement, fluid leaks.
• Solution: Rebuild or replacement of the torque converter.
• Cost: $1500 - $3000

Transmission Control Module (TCM) Failure

• Symptoms: Erratic shifting, failure to shift, limp mode activation.
• Solution: Replacement or reprogramming of the TCM.
• Cost: $800 - $1800

Suspension

Active Body Control (ABC) System

Hydraulic Fluid Leaks

• Symptoms: Vehicle sagging, suspension warning lights, stiff ride.
• Solution: Repair or replacement of leaking ABC lines, struts, or pump.
• Cost: $1000 - $4000+

ABC Pump Failure

• Symptoms: Complete loss of hydraulic pressure, vehicle sagging, suspension warning.
• Solution: Replacement of the ABC hydraulic pump.
• Cost: $1200 - $2500

Electrical

Infotainment System (COMAND)

Screen Malfunctions

• Symptoms: Flickering screen, dead pixels, unresponsiveness.
• Solution: Repair or replacement of the COMAND unit or screen.
• Cost: $500 - $1500

Keyless Go System

Door Handle Sensors

• Symptoms: Keyless entry/start not functioning intermittently or completely.
• Solution: Replacement of faulty door handle sensors.
• Cost: $300 - $700

Exterior

Retractable Hardtop Mechanism

Hydraulic Pump/Cylinder Leaks

• Symptoms: Slow or failed operation of the roof, fluid leaks under the car.
• Solution: Repair or replacement of leaking hydraulic components.
• Cost: $800 - $2000

Sensor Malfunctions

• Symptoms: Roof not closing or opening completely, error messages.
• Solution: Diagnosis and replacement of faulty roof sensors.
• Cost: $300 - $600

Interior

Seat Adjustment Motors

Malfunctioning Adjustment

• Symptoms: Power seats not moving forward, backward, or reclining.
• Solution: Replacement of faulty seat adjustment motors.
• Cost: $400 - $800 per seat

Climate Control System

Blower Motor Resistor

• Symptoms: Fan only works on certain speeds or not at all.
• Solution: Replacement of the blower motor resistor.
• Cost: $200 - $400

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Summary Verdict

The 2011 Mercedes-Benz SL65 AMG is a complex and powerful machine. While its V12 engine and performance-oriented systems are generally robust, owners should be aware of potential issues, particularly with the Active Body Control (ABC) suspension and the retractable hardtop mechanism, which can be costly to repair. Electrical gremlins, especially within the infotainment and keyless entry systems, can also arise. Transmission issues, though less common, can also occur. Regular maintenance and prompt attention to warning lights are crucial for maintaining the reliability and enjoyment of this exotic convertible.