2018 Mercedes-Benz GLS550

Introduction to 2018 Mercedes-Benz GLS550

The 2018 Mercedes-Benz GLS550 is a full-size luxury SUV powered by a 4.7L twin-turbocharged V8 engine, delivering 449 horsepower and 516 lb-ft of torque. The GLS550 comes paired with a 9-speed automatic transmission and offers a standard 4MATIC all-wheel-drive system. It boasts a spacious and well-equipped interior, including a 12.3-inch touchscreen infotainment system and a panoramic sunroof. Despite its size, the GLS550 handles surprisingly well, offering a comfortable and engaging driving experience. However, certain model years have been plagued by various issues that owners have reported.

Engine

4.7L Twin-Turbocharged V8 (M278)

• Turbocharger Failure:
  • Description/Symptoms: The turbochargers may fail prematurely, leading to a loss of power, increased exhaust smoke, and a higher fuel consumption.
  • Solution: Replace the faulty turbocharger.
  • Estimated Cost to Fix: $3,500 - $5,000+
  • Recalls: None Found

Transmission

9-Speed Automatic (9G-TRONIC)

• Shifting Hesitation or Jerking:
  • Description/Symptoms: The transmission may hesitate or jerk during gear shifts, especially at low speeds or when changing from Reverse to Drive.
  • Solution: Update the transmission control software or replace the transmission valve body.
  • Estimated Cost to Fix: $500 - $2,500
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure:
  • Description/Symptoms: The air suspension compressor may fail, resulting in a loss of air pressure and a lowered vehicle height.
  • Solution: Replace the faulty air suspension compressor.
  • Estimated Cost to Fix: $2,000 - $3,000
  • Recalls: None Found

Electrical

• Battery Drain:
  • Description/Symptoms: The battery may drain prematurely, especially when the vehicle is parked for an extended period.
  • Solution: Inspect for parasitic current drain and replace the faulty battery if necessary.
  • Estimated Cost to Fix: $200 - $500
  • Recalls: None Found

Exterior

• Headlight Condensation:
  • Description/Symptoms: Condensation may form inside the headlights, causing fogging or dimming of the lights.
  • Solution: Replace the faulty headlights or repair any leaks in the housing.
  • Estimated Cost to Fix: $1,000 - $2,000+
  • Recalls: None Found

Interior

• Sunroof Operation Malfunction:
  • Description/Symptoms: The panoramic sunroof may fail to open, close, or tilt properly.
  • Solution: Inspect for loose wires or malfunctioning sunroof motor.
  • Estimated Cost to Fix: $1,500 - $2,500
  • Recalls: None Found

Summary

Overall, the 2018 Mercedes-Benz GLS550 is a well-received luxury SUV, but it has faced some issues in certain model years. Some of the most common problems reported include turbocharger failure, transmission issues, and suspension compressor failure. While the severity and cost of repairs can vary, some of these issues can be significant and impact the overall ownership experience.