2011 Mercedes-Benz ML550

The 2011 Mercedes-Benz ML550 is a luxury SUV that offers a blend of performance and comfort. The ML550 is equipped with a 5.5-liter naturally aspirated V8 engine producing 382 horsepower and 391 lb-ft of torque. Other engine options available in the ML series for 2011 include a 3.5L V6 in the ML350, a diesel 3.0L V6 in the ML350 Bluetec, and a higher-performance 5.5L twin-turbo V8 in the ML63 AMG. All engine options are paired with a 7-speed automatic transmission (7G-TRONIC). Owners generally appreciate the ML550’s powerful engine, comfortable ride, and luxurious interior. Common complaints include the high cost of maintenance and repairs, as well as some electrical issues.

Engine

5.5L Naturally Aspirated V8

• Oil Leaks
  • Description/Symptoms: Oil leaks are a common concern, particularly from the valve cover gaskets, oil filter housing gasket, and the rear main seal. Symptoms include visible oil leaks on the engine or ground, burning oil smell, and low oil level.
  • Solution: Replacement of the leaking gaskets or seals.
  • Estimated Cost to Fix: $200 - $800+ depending on the location of the leak and the shop’s labor rates.
  • Recalls: None Found
• Camshaft Adjuster Solenoid (Cam Magnet) Leaks
  • Description/Symptoms: Oil can leak from the camshaft adjuster solenoid (also known as a cam magnet). This can lead to oil contamination of the engine wiring harness. Symptoms include oil visible around the solenoid, rough running engine, and check engine light.
  • Solution: Replacement of the leaking camshaft adjuster solenoid and cleaning/replacement of the affected wiring harness.
  • Estimated Cost to Fix: $200 - $500+ depending on the extent of the wiring harness damage.
  • Recalls: None Found

Transmission

7G-TRONIC (7-Speed Automatic)

• Rough Shifting
  • Description/Symptoms: Some owners have reported rough or delayed shifting, particularly between gears. This can be more noticeable at lower speeds or during cold starts.
  • Solution: A transmission fluid flush and filter replacement may resolve the issue. In some cases, valve body repair or replacement is needed.
  • Estimated Cost to Fix: $300 - $2000+ depending on the severity of the issue and required repair.
  • Recalls: None Found
• Torque Converter Issues
  • Description/Symptoms: Torque converter shudder or vibration, especially at highway speeds.
  • Solution: Torque converter replacement, or in some cases, a transmission rebuild.
  • Estimated Cost to Fix: $1500 - $4000+
  • Recalls: None Found

Suspension

• Airmatic Suspension Problems
  • Description/Symptoms: The ML550 uses an airmatic suspension system. Common issues include air leaks in the air struts, failure of the air compressor, and problems with the ride height sensors. Symptoms include the vehicle sitting lower than normal, especially on one side, the air compressor running constantly or not at all, and warning lights on the dash.
  • Solution: Replacement of the leaking air struts, air compressor, or ride height sensors.
  • Estimated Cost to Fix: $500 - $2000+ per strut, $500 - $1000+ for the air compressor, $200 - $500+ for ride height sensors.
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Excessive battery drain can occur due to various electrical issues. Symptoms include a dead battery, especially after the vehicle has been sitting for a short period.
  • Solution: Identifying and repairing the source of the parasitic draw. This can involve testing individual circuits and components. Common culprits include faulty door control modules, seat control modules, or the command unit.
  • Estimated Cost to Fix: $100 - $500+ depending on the complexity of the issue.
  • Recalls: None Found
• Command System Malfunctions
  • Description/Symptoms: The COMAND (Cockpit Management and Data) system, which controls the radio, navigation, and other functions, can experience malfunctions. Symptoms include a blank screen, system freezing, or failure to respond to inputs.
  • Solution: Software updates, replacement of the COMAND unit.
  • Estimated Cost to Fix: $200 - $1500+
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof malfunctions, including difficulty opening or closing, or unusual noises during operation.
  • Solution: Cleaning and lubricating the sunroof tracks, or replacement of the sunroof motor or other components.
  • Estimated Cost to Fix: $100 - $800+
  • Recalls: None Found

Interior

• Navigation Screen Delamination
  • Description/Symptoms: The LCD screen in the center console of the dashboard of the vehicle becomes delaminated.
  • Solution: Replacement of the LCD screen or the entire Center Console of the vehicle.
  • Estimated Cost to Fix: $100 - $1000+ depending on the severity of the issue.
  • Recalls: None Found

Summary

The 2011 Mercedes-Benz ML550, while a luxurious and powerful SUV, can present owners with a range of potential issues. The most common and potentially costly problems relate to the Airmatic suspension and transmission. Engine oil leaks and electrical issues, though typically less expensive to address, can still add up. The severity of these issues varies, but potential buyers should be aware of these common problems and factor in maintenance and repair costs when considering this vehicle.