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2019 Mercedes-Benz GLS550

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By Research the Car 4 min read

The 2019 Mercedes-Benz GLS550 is a full-size luxury SUV known for its spaciousness, comfortable ride, and powerful engine. The GLS550 is powered by a 4.7-liter twin-turbo V8 engine producing 449 horsepower and 516 lb-ft of torque and is paired with a 9G-TRONIC 9-speed automatic transmission. Other engine options available for the 2019 GLS class include the GLS450 (3.0L V6 Turbo) and the high-performance GLS63 AMG (5.5L V8 Bi-Turbo). Owners often praise the GLS550 for its luxurious interior, smooth ride quality, and strong acceleration. However, some common complaints include the complexity of the infotainment system, higher maintenance costs, and potential issues with the air suspension system.

Engine

4.7L Twin-Turbo V8

  • Oil Leaks
    • Description/Symptoms: Oil leaks are reported from various engine seals and gaskets, including the valve cover gaskets and oil filter housing. Symptoms include visible oil leaks on the engine, oil drips under the vehicle, and a burning oil smell.
    • Solution: Replacing the faulty gaskets or seals is the typical solution. Thorough cleaning of the affected area is also required.
    • Estimated Cost to Fix: $200 - $1,500+ depending on the location and severity of the leak
  • Turbocharger Issues
    • Description/Symptoms: Turbocharger failure can occur, leading to a loss of power, reduced fuel efficiency, and potentially a check engine light. Whining or whistling noises from the turbochargers can also be an indicator of a problem.
    • Solution: Replacement of the faulty turbocharger(s) is the common solution.
    • Estimated Cost to Fix: $2,500 - $5,000+

Transmission

9G-TRONIC 9-Speed Automatic

  • Rough or Delayed Shifting
    • Description/Symptoms: Some owners have reported experiencing rough or delayed shifts, particularly when shifting between lower gears. This can be more noticeable when the transmission is cold.
    • Solution: In some cases, a software update for the transmission control module (TCM) can resolve the issue. In more severe cases, valve body replacement or transmission overhaul may be necessary.
    • Estimated Cost to Fix: $200 (software update) - $4,000+ (transmission overhaul)
  • Torque Converter Issues
    • Description/Symptoms: Torque converter shudder or vibration at low speeds or during light acceleration can occur.
    • Solution: Torque converter replacement is usually the required fix.
    • Estimated Cost to Fix: $1,500 - $3,000+

Suspension

  • Air Suspension Problems (AIRMATIC)
    • Description/Symptoms: The AIRMATIC air suspension system is known to have issues, including compressor failure, air leaks from the struts, and uneven ride height. Symptoms include the vehicle sitting unevenly, the suspension not adjusting properly, and a warning light on the dashboard.
    • Solution: Replacement of the faulty air struts, air compressor, or air lines is usually required.
    • Estimated Cost to Fix: $1,000 - $3,000+ per strut, $800 - $1,500+ for the compressor.

Electrical

  • Infotainment System Glitches
    • Description/Symptoms: The COMAND infotainment system can experience glitches, including freezing, slow response times, and connectivity issues with Bluetooth or Apple CarPlay/Android Auto.
    • Solution: Software updates may resolve some issues. In more severe cases, replacement of the COMAND unit might be necessary.
    • Estimated Cost to Fix: $0 (software update) - $2,000+ (replacement of COMAND unit)
  • Battery Drain Issues
    • Description/Symptoms: Some owners have reported issues with the battery draining quickly, especially if the vehicle is not driven frequently. This can be caused by parasitic draws from various electronic components.
    • Solution: Identifying and addressing the source of the parasitic draw. Replacing the battery may also be necessary if it has been significantly degraded.
    • Estimated Cost to Fix: $150 - $300+ (battery replacement), $100+ (diagnosis and repair of parasitic draw)

Interior

  • Sunroof Issues
    • Description/Symptoms: Sunroof malfunctions, including failure to open or close properly, unusual noises during operation, and water leaks.
    • Solution: Repair or replacement of the sunroof motor, track, or seals.
    • Estimated Cost to Fix: $300 - $1,500+

Exterior

  • Sensor Malfunctions (Parking Sensors, Blind Spot Monitoring)
    • Description/Symptoms: The parking sensors or blind spot monitoring system can malfunction, providing false alerts or failing to detect objects. This can be due to sensor damage, dirt accumulation, or wiring issues.
    • Solution: Cleaning or replacing the faulty sensor(s) and inspecting the wiring.
    • Estimated Cost to Fix: $200 - $500+ per sensor

Recalls:

  • Recall ID: 21V952000
    • Description: The emergency call (eCall) system may transmit an inaccurate vehicle location to emergency responders, delaying assistance.
    • Remedy: Mercedes-Benz will update the communication module software, free of charge.
  • Recall ID: 20V773000
    • Description: The driver and front passenger side airbags may not deploy properly in a crash, increasing the risk of injury.
    • Remedy: Mercedes-Benz will replace the affected airbags, free of charge.

Summary:

The 2019 Mercedes-Benz GLS550 is a luxurious and capable SUV, but it’s prone to certain issues. The most concerning problems involve the air suspension and potential engine or transmission malfunctions, which can be costly to repair. Electrical gremlins in the infotainment system are also a common complaint. While the vehicle offers a premium driving experience, potential buyers should be aware of these potential issues and factor in the cost of maintenance and repairs. The identified recalls should also be checked and addressed by a certified Mercedes-Benz technician. The severity of the issues ranges from minor software glitches to major component failures, with repair costs varying accordingly.

Mercedes-Benz, GLS550
Mercedes-Benz GLS550 2019
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