2011 Mercedes-Benz GL450

The 2011 Mercedes-Benz GL450 is a full-size luxury SUV known for its spacious interior, comfortable ride, and powerful engine. Other engine options for this model year include the GL350 BlueTEC diesel V6, the GL550 with a gasoline V8, and the high-performance GL63 AMG. The GL450 comes standard with a 4.6L V8 engine that produces 335 horsepower and 339 lb-ft of torque. All models are equipped with a 7-speed automatic transmission. Owners generally appreciate the GL450’s luxurious features and smooth ride, but some dislike its high maintenance costs and complex electronics.

Engine

4.6L V8 Gasoline (M273)

• Camshaft Adjuster Solenoid Failure
  • Description/Symptoms: Engine misfires, rough idling, check engine light illuminated. Diagnostic trouble codes (DTCs) related to camshaft position or timing.
  • Solution: Replace the faulty camshaft adjuster solenoid(s).
  • Estimated Cost to Fix: $200 - $500+
  • Recalls: None Found
• Oil Leaks from Valve Cover Gaskets
  • Description/Symptoms: Visible oil leaks on the engine, burning oil smell, low oil level.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $300 - $700+
  • Recalls: None Found
• Coolant Leaks from Water Pump
  • Description/Symptoms: Overheating, low coolant level, visible coolant leak near the front of the engine.
  • Solution: Replace the water pump.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found

Transmission

7-Speed Automatic (7G-Tronic / 722.9)

• Conductor Plate Failure
  • Description/Symptoms: Harsh shifting, delayed shifting, getting stuck in gear (limp mode), check engine light illuminated.
  • Solution: Replace the conductor plate within the transmission.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• Torque Converter Issues
  • Description/Symptoms: Shuddering or vibrations at low speeds, particularly during light acceleration.
  • Solution: Replacement of the torque converter.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, ride height malfunction, “Visit Workshop” message on the instrument cluster. Compressor failing to inflate the system.
  • Solution: Replace faulty air struts, air compressor, or air lines.
  • Estimated Cost to Fix: $800 - $2000+ per strut; $500 - $1000+ for compressor
  • Recalls: None Found
• Airmatic Compressor Relay Failure
  • Description/Symptoms: Airmatic compressor runs continuously, leading to compressor burnout or battery drain.
  • Solution: Replace the Airmatic compressor relay.
  • Estimated Cost to Fix: $50 - $200+
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Dead battery, difficulty starting the vehicle, frequent jump starts required.
  • Solution: Diagnose and repair parasitic drain, which could be caused by a faulty module, wiring issue, or aftermarket accessory.
  • Estimated Cost to Fix: $100 - $500+ (diagnostic and repair)
  • Recalls: None Found
• Power Window Regulator Failure
  • Description/Symptoms: Window not operating, slow or erratic window movement, clicking sounds from the door.
  • Solution: Replace the faulty window regulator.
  • Estimated Cost to Fix: $250 - $600+
  • Recalls: None Found
• EIS/ESL Failure
  • Description/Symptoms: Key not recognized, unable to start the vehicle, steering wheel lock malfunction.
  • Solution: Replacement of the Electronic Ignition Switch (EIS) and/or Electronic Steering Lock (ESL).
  • Estimated Cost to Fix: $800 - $2000+
  • Recalls: None Found

Exterior

• Tail Light Assembly Issues
  • Description/Symptoms: Bulb failure warnings, flickering lights, complete tail light failure due to corroded connectors or faulty circuit boards.
  • Solution: Replace the affected tail light assembly or repair the wiring.
  • Estimated Cost to Fix: $150 - $500+ per assembly
  • Recalls: None Found

Interior

• Sunroof Malfunction
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, unusual noises during operation.
  • Solution: Diagnose and repair or replace the sunroof motor, tracks, or cables.
  • Estimated Cost to Fix: $300 - $1000+
  • Recalls: None Found
• Navigation/Infotainment System Issues
  • Description/Symptoms: System freezing, unresponsive touchscreen, navigation errors, Bluetooth connectivity problems.
  • Solution: Software update, replacement of the head unit.
  • Estimated Cost to Fix: $100 - $1000+ (depending on repair vs. replacement)
  • Recalls: None Found

Summary

The 2011 Mercedes-Benz GL450, while offering luxury and performance, is prone to several issues, particularly related to its complex airmatic suspension, electrical components, and the 7G-Tronic transmission. Engine oil leaks and coolant leaks are also relatively common. The cost of repairing these issues can be significant, with airmatic suspension and transmission repairs often exceeding $1000. Potential buyers should carefully inspect these systems and factor in the potential for high maintenance costs when considering this vehicle.