2007 Mercedes-Benz SL550

The 2007 Mercedes-Benz SL550 is a luxury roadster known for its retractable hardtop, powerful engine, and comfortable ride. The SL550 came standard with a 5.5L V8 engine producing 382 horsepower and 391 lb-ft of torque, paired with a 7-speed automatic transmission (7G-Tronic). While offering a blend of performance and luxury, some owners have reported various issues. Common praises include the powerful V8 engine, refined interior, and the convenience of the hardtop convertible. Complaints often revolve around the cost of maintenance and repairs, particularly with the complex systems like the Active Body Control (ABC) suspension.

Engine

5.5L V8

• Camshaft Adjuster Solenoid Failure
  • Description/Symptoms: Engine may experience rough idling, misfires, and reduced power. Diagnostic trouble codes (DTCs) related to camshaft timing or position may be present.
  • Solution: Replacement of the faulty camshaft adjuster solenoid.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found
• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks are visible around the valve covers, potentially dripping onto exhaust components and creating a burning smell. Low oil levels and oil consumption may also be observed.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $300 - $600+
  • Recalls: None Found

Transmission

7G-Tronic 7-Speed Automatic

• Torque Converter Failure
  • Description/Symptoms: Shuddering during acceleration, especially at lower speeds, slipping between gears, and/or harsh shifting.
  • Solution: Replacement of the torque converter.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Erratic shifting, delayed engagement of gears, or getting stuck in a gear. Diagnostic trouble codes related to valve body function may be present.
  • Solution: Replacement or rebuild of the valve body.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found

Suspension

• Active Body Control (ABC) System Leaks
  • Description/Symptoms: The ABC system uses hydraulic fluid to control the suspension. Leaks are common in the lines, struts, and pump. Symptoms include a sagging suspension, warning lights on the dashboard, and a stiff or bouncy ride.
  • Solution: Repair or replacement of leaking components, such as hydraulic lines, struts, or the pump. Flushing the system is also recommended.
  • Estimated Cost to Fix: $500 - $3,000+ (depending on the component)
  • Recalls: None Found
• ABC Pump Failure
  • Description/Symptoms: The ABC pump provides pressure to the hydraulic system. Failure results in a complete loss of ABC function, causing a very stiff and uncomfortable ride.
  • Solution: Replacement of the ABC pump.
  • Estimated Cost to Fix: $1,000 - $2,500+
  • Recalls: None Found

Electrical

• Retractable Hardtop Malfunctions
  • Description/Symptoms: The retractable hardtop may fail to open or close completely, or operate intermittently. Issues could be related to faulty sensors, hydraulic pumps, or the control module.
  • Solution: Diagnosis of the specific issue and repair or replacement of the affected components. This may involve sensor replacement, hydraulic pump repair, or control module reprogramming.
  • Estimated Cost to Fix: $300 - $2,000+ (depending on the component)
  • Recalls: None Found
• COMAND System Issues
  • Description/Symptoms: The COMAND system (Cockpit Management and Data system) can experience problems with the display screen, navigation, audio, or Bluetooth connectivity.
  • Solution: Resetting the system, software updates, or replacement of faulty components.
  • Estimated Cost to Fix: $200 - $1,500+ (depending on the component)
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: The vehicle experiences a rapid battery drain, especially when parked for extended periods. This can be attributed to a parasitic draw from a faulty module or accessory.
  • Solution: Identify and repair the source of the parasitic draw.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• Convertible Top Hydraulic System Leaks
  • Description/Symptoms: Leaks in the hydraulic cylinders or lines responsible for operating the convertible top mechanism. This can cause slow or incomplete operation of the top.
  • Solution: Replacing the leaky hydraulic cylinders or lines.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Interior

• Seat Heater Malfunction
  • Description/Symptoms: The seat heaters may fail to operate or become excessively hot. This can be due to a faulty heating element or control module.
  • Solution: Replacement of the faulty heating element or control module.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found
• Air Conditioning Issues
  • Description/Symptoms: Weak or no cold air, unusual noises from the AC compressor, or inconsistent temperature control.
  • Solution: Diagnosis of the AC system, which may involve refrigerant recharge, component replacement (compressor, condenser, evaporator), or leak repair.
  • Estimated Cost to Fix: $200 - $1,500+
  • Recalls: None Found

Summary

The 2007 Mercedes-Benz SL550, while a luxurious and powerful roadster, can present owners with a range of issues, particularly related to its complex suspension and electrical systems. The ABC suspension is a known weak point, and the retractable hardtop mechanism can also be problematic. Engine and transmission issues are typical of higher-mileage vehicles. Repairs can be costly due to the complexity of the systems and the price of Mercedes-Benz parts. Potential buyers should be aware of these potential issues and factor in maintenance costs when considering purchasing this vehicle.