2007 Mercedes-Benz GL320

The 2007 Mercedes-Benz GL320 is a full-size luxury SUV that offered a blend of comfort, capability, and Mercedes-Benz refinement. The GL320 featured a 3.0L turbo-diesel V6 engine producing 215 horsepower and 398 lb-ft of torque. Other engine options included the GL450 with a 4.7L V8 and the GL550 with a 5.5L V8. All engine options were paired with a 7-speed automatic transmission. Owners generally liked the spacious interior, comfortable ride, and off-road capability, while common dislikes included the high cost of maintenance and repairs, and some reported issues with reliability.

Engine

3.0L Turbo-Diesel V6 (OM642)

• Oil Cooler Seal Leaks
  • Description/Symptoms: Oil leaks externally from the oil cooler, often dripping onto other components. This can cause a burning smell and potentially lead to low oil levels.
  • Solution: Replace the oil cooler seals.
  • Estimated Cost to Fix: $300 - $600
  • Recalls: None Found
• Swirl Motor Failure
  • Description/Symptoms: Check engine light illuminated, often accompanied by fault codes related to the swirl flaps or swirl motor. Reduced engine performance.
  • Solution: Replace the swirl motor.
  • Estimated Cost to Fix: $500 - $1000+
  • Recalls: None Found
• Turbocharger Failure
  • Description/Symptoms: Loss of power, excessive smoke from the exhaust, whistling or whining noise from the turbocharger.
  • Solution: Turbocharger replacement.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

Transmission

7G-Tronic 722.9 (All Engines)

• Valve Body Issues
  • Description/Symptoms: Harsh shifting, delayed engagement, slipping between gears, or complete loss of gear engagement.
  • Solution: Valve body replacement or repair.
  • Estimated Cost to Fix: $800 - $2000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibration at low speeds, stalling, abnormal noises.
  • Solution: Torque converter replacement.
  • Estimated Cost to Fix: $1000 - $2500+
  • Recalls: None Found

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: Vehicle sitting unevenly, sagging suspension, compressor running constantly, “Visit Workshop” message displayed.
  • Solution: Replace air struts, air compressor, or air lines.
  • Estimated Cost to Fix: $800 - $2000+ per strut, $500 - $1200 for compressor.
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, unable to start the vehicle, steering wheel lock malfunction.
  • Solution: EIS replacement or repair, potentially requiring programming.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: Malfunctioning lights, wipers, or other electrical components.
  • Solution: SAM replacement and programming.
  • Estimated Cost to Fix: $500 - $1200+
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Rust forming on door panels, wheel arches, around lights, and on the tailgate.
  • Solution: Repairing/replacing the rusted areas.
  • Estimated Cost to Fix: Varies greatly depending on severity.
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof motor failure, getting stuck open or closed, leaking.
  • Solution: Sunroof motor replacement, track repair, or seal replacement.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Summary

The 2007 Mercedes-Benz GL320, while a luxurious and capable SUV, can be prone to certain issues, especially given its age. The diesel engine can experience oil leaks and swirl motor problems, and the Airmatic suspension can be costly to maintain. Electrical issues with the EIS and SAM modules can also occur. Many repairs are expensive due to the complexity of the vehicle and the cost of Mercedes-Benz parts. Potential buyers should be aware of these common problems and factor them into their purchasing decision. Inspecting for these issues prior to purchase and budgeting for potential repairs is highly recommended.