2009 Mercedes-Benz G55 AMG

The 2009 Mercedes-Benz G55 AMG is a high-performance SUV known for its rugged capabilities and luxurious features. The sole engine option for this model year is a 5.5-liter supercharged V8 engine, producing 500 horsepower and 516 lb-ft of torque. It is paired with a 5-speed automatic transmission. Owners often praise the G55 AMG for its distinctive styling, off-road prowess, and powerful engine. Common complaints revolve around its poor fuel economy, high maintenance costs, and somewhat outdated technology compared to more modern SUVs.

Engine

5.5L Supercharged V8

• Supercharger Failure
  • Description/Symptoms: Whining noise from the engine, loss of power, check engine light illumination.
  • Solution: Replacement of the supercharger unit.
  • Estimated Cost to Fix: $4,000 - $7,000+
  • Recalls: None Found
• Valve Cover Gasket Leaks
  • Description/Symptoms: Oil leaks visible around the valve covers, burning oil smell.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $500 - $1,000
  • Recalls: None Found
• Oil Cooler Leaks
  • Description/Symptoms: Oil leaks visible around the oil cooler or oil filter housing, low oil level, burning oil smell.
  • Solution: Replacement of the oil cooler or associated seals.
  • Estimated Cost to Fix: $800 - $1,500
  • Recalls: None Found

Transmission

5-Speed Automatic

• Slipping or Harsh Shifting
  • Description/Symptoms: Delayed gear changes, abrupt or jerky shifting, transmission slipping during acceleration.
  • Solution: Transmission fluid flush, valve body repair or replacement, or complete transmission rebuild/replacement.
  • Estimated Cost to Fix: $300 (fluid flush) - $5,000+ (transmission replacement)
  • Recalls: None Found

Suspension

• Air Suspension Compressor Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, “Visit Workshop” message related to air suspension, compressor running constantly or not at all.
  • Solution: Replacement of the air suspension compressor.
  • Estimated Cost to Fix: $800 - $1,500
  • Recalls: None Found
• Air Strut Leaks
  • Description/Symptoms: Vehicle sagging, hissing sound from the suspension, poor ride quality.
  • Solution: Replacement of leaking air struts.
  • Estimated Cost to Fix: $1,000 - $2,000 per strut
  • Recalls: None Found

Electrical

• Battery Drain Issues
  • Description/Symptoms: Frequent dead battery, difficulty starting the vehicle, electrical components malfunctioning.
  • Solution: Diagnosis and repair of parasitic drain, replacement of faulty battery.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found
• Malfunctioning Window Regulators
  • Description/Symptoms: Windows not operating properly, slow or erratic movement, window falling off track.
  • Solution: Replacement of faulty window regulator.
  • Estimated Cost to Fix: $300 - $600 per window
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust forming on body panels, especially around door edges, wheel arches, and undercarriage.
  • Solution: Rust removal and repainting, body panel replacement.
  • Estimated Cost to Fix: $500 - $5,000+ (depending on severity)
  • Recalls: None Found

Interior

• Headliner Sagging
  • Description/Symptoms: Headliner fabric detaching from the roof.
  • Solution: Replacement or re-gluing of headliner fabric.
  • Estimated Cost to Fix: $300 - $800
  • Recalls: None Found

Summary

The 2009 Mercedes-Benz G55 AMG, while a desirable vehicle, is known for some specific issues related to its engine, transmission, suspension, and electrical systems. Engine problems often revolve around supercharger failure and oil leaks, which can be expensive to repair. The air suspension is another area prone to issues, and electrical gremlins can also occur. Rust is also a concern, particularly in areas with harsh climates. Owners should be prepared for potentially high maintenance costs when owning a G55 AMG of this vintage.