2017 Mercedes-Benz GLS450

The 2017 Mercedes-Benz GLS450 is a luxurious and spacious SUV that offers a comfortable ride and a range of features. It was offered with the 3.0L Turbo V6 engine that produced 362 horsepower and 369 lb-ft of torque. The GLS was also available with a V8 engine in the GLS550 and AMG GLS63 trim levels. All models were equipped with a 9-speed automatic transmission. Owners generally appreciate the GLS450’s comfortable ride, spacious interior, and upscale features. Some common complaints include the complicated infotainment system and higher repair costs compared to non-luxury SUVs.

Engine

3.0L Turbo V6

• Oil Leaks
  • Description/Symptoms: Oil leaks may develop from various locations, including the valve cover gaskets, oil filter housing, or the front timing cover. Symptoms include visible oil leaks on the engine, burning oil smell, and low oil levels.
  • Solution: Replacing the leaking gaskets or seals is the typical repair.
  • Estimated Cost to Fix: $200 - $1,500+ depending on the source of the leak.
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Whining noises from the engine, loss of power, and/or a check engine light. These symptoms could indicate an issue with the turbocharger.
  • Solution: Turbocharger inspection and replacement if necessary.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Transmission

9G-Tronic 9-Speed Automatic (725.0 or 725.1)

• Rough or Delayed Shifting
  • Description/Symptoms: Hesitation or harshness during gear changes, especially when cold. The vehicle might shudder or jerk during shifts.
  • Solution: Software update to the Transmission Control Module (TCM). If the issue persists, valve body replacement or transmission rebuild/replacement may be necessary.
  • Estimated Cost to Fix: $200 for software updates; $1,500 - $5,000+ for valve body or transmission work.
  • Recalls: None Found

Suspension

• Air Suspension Malfunctions (if equipped)
  • Description/Symptoms: Vehicle sitting low on one or more corners, air compressor running constantly, or a warning light on the dashboard. Could indicate leaks in the air struts, compressor failure, or issues with the air suspension control module.
  • Solution: Diagnose the specific issue (leaks, compressor, module) and replace the faulty components.
  • Estimated Cost to Fix: $800 - $2,000+ per air strut; $500 - $1,500+ for compressor replacement.
  • Recalls: None Found

Electrical

• COMAND Infotainment System Issues
  • Description/Symptoms: System freezing, slow response times, Bluetooth connectivity problems, screen flickering, or complete system failure.
  • Solution: Software update, replacement of the head unit, or repair of damaged wiring.
  • Estimated Cost to Fix: $150 - $500 for software updates; $500 - $2,000+ for head unit replacement.
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: The battery drains quickly, especially when the car is not in use. This can be caused by a parasitic draw from a faulty module or a malfunctioning component.
  • Solution: Identify the source of the parasitic draw and replace or repair the faulty component.
  • Estimated Cost to Fix: $100 - $1,000+ depending on the source of the draw.
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof may not open or close properly, may make excessive noise during operation, or may leak water.
  • Solution: Repair or replace the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $300 - $1,500+
  • Recalls: None Found

Interior

• Malfunctioning Power Seats
  • Description/Symptoms: Power seats failing to adjust in one or more directions. This may be due to a faulty motor, switch, or wiring issue.
  • Solution: Diagnose and replace the faulty component (motor, switch, or wiring).
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• Cracked Dashboard
  • Description/Symptoms: Cracking of the dashboard, especially in warmer climates. This is due to the dashboard material degrading in the sun.
  • Solution: Dashboard replacement
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Summary

The 2017 Mercedes-Benz GLS450, while a luxurious and comfortable SUV, can experience some common issues. Engine oil leaks and transmission issues, particularly rough shifting, are potential concerns that could lead to moderate repair costs. Air suspension problems, if equipped, can also be a significant expense. Electrical issues with the infotainment system and battery drain can be frustrating. While these issues are not necessarily present in every vehicle, potential buyers should be aware of them and factor potential repair costs into their purchasing decision.