2009 Mercedes-Benz SL63 AMG

The 2009 Mercedes-Benz SL63 AMG is a high-performance roadster known for its exhilarating driving experience and luxurious features. While it offers a thrilling ride, potential buyers should be aware of some common issues reported by owners. The SL63 AMG came equipped with a 6.2L M156 V8 engine producing 518 horsepower and 465 lb-ft of torque. It was available only with the AMG Speedshift MCT 7-speed transmission. Owners appreciate the car’s powerful engine, distinctive AMG styling, and comfortable interior. However, some have expressed concerns about its high running costs, complex electronics, and potential for expensive repairs.

Engine

6.2L M156 V8

• Camshaft Adjuster Bolts Failure
  • Description/Symptoms: The M156 engine is known to have issues with the camshaft adjuster bolts. These bolts can break, leading to engine damage. Symptoms include a ticking or rattling noise from the engine, especially on startup, and potential engine misfires.
  • Solution: Replace the camshaft adjuster bolts with the updated design.
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found
• Intake Manifold Failure
  • Description/Symptoms: The intake manifold can develop cracks, leading to vacuum leaks. This can cause poor engine performance, rough idling, and check engine light illumination.
  • Solution: Replace the intake manifold with a new one.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found
• Valve Lifter/Hydraulic Lash Adjuster Issues
  • Description/Symptoms: Ticking noise, especially when cold. This can develop into a more consistent sound.
  • Solution: Replace the valve lifters/hydraulic lash adjusters.
  • Estimated Cost to Fix: $2,000 - $4,000+
  • Recalls: None Found

Transmission

AMG Speedshift MCT 7-Speed

• Valve Body Issues
  • Description/Symptoms: Harsh or erratic shifting, slipping between gears, or failure to shift. The transmission may go into limp mode.
  • Solution: Replace or rebuild the valve body. In some cases, a software update may resolve the issue.
  • Estimated Cost to Fix: $1,500 - $4,000+
  • Recalls: None Found

Suspension

• ABC (Active Body Control) System Leaks/Failure
  • Description/Symptoms: The ABC system is prone to leaks in the hydraulic lines, struts, and pump. This can cause the car to sag on one side, ride height issues, and warning lights on the dashboard. The pump can also fail, resulting in a complete loss of ABC function.
  • Solution: Repair or replace the leaking components. The pump, struts, and lines may need to be replaced. Flushing the system and replacing the filter can also help.
  • Estimated Cost to Fix: $1,000 - $6,000+ (depending on the component)
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Rapid battery drain, especially when the car is not driven frequently. This can be caused by a variety of issues, including faulty control modules, aftermarket accessories, or a failing alternator.
  • Solution: Diagnose and repair the source of the battery drain. This may involve testing the charging system, checking for parasitic draws, and replacing faulty components.
  • Estimated Cost to Fix: $100 - $1,000+ (depending on the cause)
  • Recalls: None Found
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: The SAM modules control various electrical functions in the car. Failure of a SAM module can cause a wide range of issues, including lighting problems, wiper malfunction, and starting problems.
  • Solution: Replace the faulty SAM module.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found

Exterior

• Retractable Hardtop Issues
  • Description/Symptoms: The retractable hardtop mechanism can experience problems, including failure to open or close completely, unusual noises during operation, and leaks.
  • Solution: Diagnose and repair the hardtop mechanism. This may involve lubricating the moving parts, replacing hydraulic components, or reprogramming the control module.
  • Estimated Cost to Fix: $500 - $3,000+
  • Recalls: None Found

Interior

• COMAND System Malfunctions
  • Description/Symptoms: The COMAND system, which controls the navigation, audio, and other features, can experience malfunctions, including screen freezing, unresponsive buttons, and audio problems.
  • Solution: Reset the COMAND system, update the software, or replace the head unit.
  • Estimated Cost to Fix: $200 - $2,000+
  • Recalls: None Found

Summary

The 2009 Mercedes-Benz SL63 AMG is a desirable performance car but is known to have issues with the engine, transmission, suspension, and electrical systems. The camshaft adjuster bolt issues and ABC suspension leaks are particularly concerning due to their potential for high repair costs. Addressing these common problems can range from a few hundred dollars to several thousand, making it essential to thoroughly inspect the car and obtain a pre-purchase inspection before buying.