2009 Mercedes-Benz SL600

The 2009 Mercedes-Benz SL600 is a luxurious roadster equipped with a powerful 5.5L Twin-Turbo V12 engine, producing 510 horsepower and 612 lb-ft of torque. Other engine options available for the 2009 SL-Class include the SL550 with a 5.5L V8 and the SL63 AMG with a 6.2L V8. All engines are paired with an automatic transmission, specific to each model. Owners appreciate the SL600’s refined performance, luxurious features, and comfortable ride. However, potential drawbacks include high maintenance costs, complex electronics, and potential issues with the hydraulic suspension system.

Engine

5.5L Twin-Turbo V12 (M275)

• Oil Leaks
  • Description/Symptoms: Oil leaks can occur from various locations on the engine, including the valve cover gaskets, oil pan gasket, and turbocharger lines. Symptoms include visible oil leaks, oil spots on the ground, and a burning oil smell.
  • Solution: Replacing the leaking gaskets or seals.
  • Estimated Cost to Fix: $200 - $1,500+ depending on the location and complexity of the repair.
• Coil Pack Failure
  • Description/Symptoms: M275 engines are known for coil pack failures, leading to misfires, rough running, and a check engine light.
  • Solution: Replacing the faulty coil pack(s).
  • Estimated Cost to Fix: $150 - $400+ per coil pack, including labor.
• Turbocharger Issues
  • Description/Symptoms: The turbochargers can experience issues such as bearing wear, boost leaks, or wastegate malfunction, resulting in reduced power, whistling noises, and a check engine light.
  • Solution: Replacing or rebuilding the turbocharger(s).
  • Estimated Cost to Fix: $2,000 - $5,000+ depending on the extent of the damage and whether one or both turbos need attention.

Recalls: None Found

Transmission

5-Speed Automatic Transmission (722.6)

• Valve Body Issues
  • Description/Symptoms: Erratic shifting, harsh gear changes, slipping, or failure to shift can be caused by a malfunctioning valve body.
  • Solution: Replacing or rebuilding the valve body.
  • Estimated Cost to Fix: $800 - $2,000+
• Torque Converter Failure
  • Description/Symptoms: Shuddering, stalling, or complete transmission failure can result from a failing torque converter.
  • Solution: Replacing the torque converter.
  • Estimated Cost to Fix: $1,000 - $3,000+

Recalls: None Found

Suspension

• ABC (Active Body Control) System Leaks and Failure
  • Description/Symptoms: The ABC system can develop leaks in the hydraulic lines, struts, or pump, leading to a loss of ride height, uneven suspension, and warning lights. Struts can also fail internally.
  • Solution: Replacing leaking lines, struts, or the pump. In some cases, a full system flush and refill may be required.
  • Estimated Cost to Fix: $500 - $3,000+ per component, potentially much higher for a complete system overhaul.
• ABC Pump Failure
  • Description/Symptoms: Whining noises, hard steering, and suspension issues.
  • Solution: Replacing the pump.
  • Estimated Cost to Fix: $1,500 - $3,000+

Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: The SL600’s complex electronics can cause excessive battery drain, especially if the car is not driven frequently.
  • Solution: Identifying and addressing the source of the drain. This may involve replacing faulty modules, repairing wiring issues, or installing a battery maintainer.
  • Estimated Cost to Fix: $100 - $1,000+ depending on the complexity of the issue.
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: Malfunctions in various electrical systems, such as lighting, wipers, or door locks.
  • Solution: Replacing the faulty SAM unit.
  • Estimated Cost to Fix: $500 - $1,500+
• Convertible Top Issues
  • Description/Symptoms: Failure to open or close, slow operation, or error messages. Issues can stem from hydraulic pump, sensors, or wiring problems.
  • Solution: Diagnosing and repairing the specific cause of the problem, which may involve replacing hydraulic components, sensors, or wiring.
  • Estimated Cost to Fix: $300 - $3,000+ depending on the severity.

Recalls: None Found

Exterior

• Convertible Top Seal Leaks
  • Description/Symptoms: Water leaks around the convertible top seals, particularly in the corners.
  • Solution: Replacing or adjusting the seals.
  • Estimated Cost to Fix: $100 - $500+ per seal.

Recalls: None Found

Interior

• COMAND System Malfunctions
  • Description/Symptoms: The COMAND system can experience glitches, freezes, or complete failure.
  • Solution: Attempting a software update, replacing the COMAND unit, or addressing underlying electrical issues.
  • Estimated Cost to Fix: $200 - $2,000+

Recalls: None Found

Summary

The 2009 Mercedes-Benz SL600 offers impressive performance and luxury but can be prone to several costly issues. Engine problems, particularly oil leaks and coil pack failures in the V12, are common. The ABC suspension system is also a frequent source of trouble due to its complexity and hydraulic components. Electrical issues can also be a headache. Potential owners should be prepared for higher-than-average maintenance costs and prioritize a thorough pre-purchase inspection to identify potential problems. The severity of the issues ranges from minor inconveniences to major repairs, with costs potentially exceeding several thousand dollars depending on the problem.