2018 Mercedes-Benz G550 4x4

The 2018 Mercedes-Benz G550 4x4 Squared is a truly unique and imposing off-road machine. It features portal axles, significantly increased ground clearance, and a luxurious interior. The G550 4x4 Squared is powered by a 4.0-liter twin-turbocharged V8 engine producing 416 horsepower and 450 lb-ft of torque, paired with a 7-speed automatic transmission. While celebrated for its exceptional off-road capabilities and head-turning presence, some owners have reported specific issues. Downsides can include a high purchase price, poor fuel economy, and challenging maneuverability in tight spaces. Other G-Class models include engine options such as a diesel V6 and a more powerful AMG V8. The transmission is typically a 7-speed or 9-speed automatic, depending on the model year and engine.

Engine

4.0L Twin-Turbo V8

• Oil Leaks
  • Description/Symptoms: Oil leaks are sometimes reported from various engine seals and gaskets, including the valve cover gaskets and oil pan gasket. Symptoms include visible oil puddles under the vehicle, the smell of burning oil, and low oil levels.
  • Solution: Replacing the affected gaskets and seals.
  • Estimated Cost to Fix: $500 - $1,500+ depending on the leak location and complexity.
• Turbocharger Issues
  • Description/Symptoms: Some owners have reported issues with the turbochargers, including premature failure or excessive noise. Symptoms can include reduced engine power, whistling or grinding noises from the engine bay, and diagnostic trouble codes (DTCs) related to the turbocharger system.
  • Solution: Diagnosis by a qualified mechanic to determine the cause of the issue. Replacement of the turbocharger(s) may be necessary.
  • Estimated Cost to Fix: $3,000 - $6,000+ (for turbocharger replacement)

Transmission

7-Speed Automatic

• Harsh Shifting
  • Description/Symptoms: Some owners have reported harsh or jerky shifting, particularly at lower speeds.
  • Solution: Transmission fluid flush, software update, or valve body repair/replacement.
  • Estimated Cost to Fix: $300 - $2,500+ depending on the severity and required repairs.

Suspension

• Air Suspension Malfunctions
  • Description/Symptoms: The G550 4x4 Squared utilizes an air suspension system, which can be prone to malfunctions. Common issues include air leaks, compressor failure, and ride height sensor problems. Symptoms include the vehicle sitting unevenly, the suspension not adjusting properly, and warning lights on the dashboard.
  • Solution: Diagnosing the specific component causing the issue. This may involve replacing air struts, the air compressor, ride height sensors, or air lines.
  • Estimated Cost to Fix: $1,000 - $5,000+ depending on the failed component.

Electrical

• Infotainment System Issues
  • Description/Symptoms: Issues with the COMAND infotainment system have been reported, including screen freezing, Bluetooth connectivity problems, and navigation malfunctions.
  • Solution: Software updates, system resets, or replacement of the infotainment unit.
  • Estimated Cost to Fix: $200 - $2,000+ depending on the fix.
• Sensor Failures
  • Description/Symptoms: Various sensors can fail, including oxygen sensors, mass airflow sensors, and wheel speed sensors. Symptoms vary depending on the affected sensor but can include poor engine performance, warning lights, and ABS/traction control issues.
  • Solution: Diagnosing the failed sensor and replacing it.
  • Estimated Cost to Fix: $200 - $800+ per sensor, including labor.
• Battery Drain
  • Description/Symptoms: Some owners have reported issues with rapid battery drain, especially if the vehicle is not driven frequently.
  • Solution: Testing the battery and charging system, checking for parasitic draws, and replacing the battery if necessary.
  • Estimated Cost to Fix: $100 - $500+

Exterior

• Rust
  • Description/Symptoms: Some owners have reported rust forming on the body, particularly around the hinges, door seams, and underneath the vehicle. This is more common in areas with harsh winters and road salt use.
  • Solution: Repairing and repainting the affected areas. Applying rust prevention treatments.
  • Estimated Cost to Fix: $500 - $5,000+ depending on the extent of the rust damage.

Interior

• Sunroof Issues
  • Description/Symptoms: The sunroof mechanism can sometimes experience issues, such as getting stuck, making excessive noise, or leaking.
  • Solution: Lubricating the sunroof tracks, repairing or replacing the sunroof motor, or replacing the sunroof seal.
  • Estimated Cost to Fix: $300 - $1,500+

Recalls: None Found

Summary:

The 2018 Mercedes-Benz G550 4x4 Squared is a capable off-road vehicle with luxury features, but it can experience some issues. The most common issues revolve around the engine, suspension, electrical components, and potential for rust. The air suspension system is also a known area of concern. Some of these issues can be costly to repair, particularly those involving the turbochargers or air suspension. Potential buyers should be aware of these potential problems and have the vehicle thoroughly inspected before purchasing.