2009 Mercedes-Benz GLK350

The 2009 Mercedes-Benz GLK350 is a compact luxury SUV that blends Mercedes’ refined styling with a practical, versatile body style. The sole engine option for the 2009 GLK350 in North America was a 3.5-liter V6 engine producing 268 horsepower and 258 lb-ft of torque. It was paired with a 7-speed automatic transmission. Some owners appreciate the GLK350’s solid build quality, comfortable ride, and Mercedes-Benz brand cachet. Common complaints include relatively high maintenance costs, some issues with electronic components, and a somewhat firm ride on rough roads.

Engine

3.5L V6

• Oil Leaks
  • Description/Symptoms: Oil leaks can develop from various locations including the valve cover gaskets, oil filter housing gasket, and front timing cover. Symptoms include visible oil leaks on the engine, oil spots on the ground, and a burning oil smell.
  • Solution: Replacing the leaking gaskets or seals.
  • Estimated Cost to Fix: $200 - $800+ depending on the location of the leak.
  • Recalls: None Found
• Camshaft Adjuster Solenoid (Cam Magnet) Failure
  • Description/Symptoms: The camshaft adjuster solenoids, also known as cam magnets, can fail, leading to rough idling, poor performance, and illuminated check engine light.
  • Solution: Replacement of the faulty cam magnet(s).
  • Estimated Cost to Fix: $150 - $400+ depending on labor costs.
  • Recalls: None Found
• Check Engine Light - Crankshaft Position Sensor
  • Description/Symptoms: Engine cranks but does not start, stalling, rough running engine. Check engine light can be tripped with codes such as P0335.
  • Solution: Replace the crankshaft position sensor.
  • Estimated Cost to Fix: $100 - $300
  • Recalls: None Found

Transmission

7G-TRONIC 722.9 7-Speed Automatic

• Valve Body Issues
  • Description/Symptoms: Harsh or erratic shifting, delayed engagement, or slipping between gears. These issues often stem from the valve body within the transmission.
  • Solution: Valve body replacement or rebuild. In some cases, flushing the transmission fluid and replacing the conductor plate (which houses sensors) can resolve the issue.
  • Estimated Cost to Fix: $800 - $2000+ depending on the extent of the repair.
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibration at low speeds, particularly during acceleration. Can also cause stalling.
  • Solution: Torque converter replacement.
  • Estimated Cost to Fix: $1500 - $3000+
  • Recalls: None Found

Suspension

• Suspension Bushing Wear
  • Description/Symptoms: Clunking or squeaking noises coming from the suspension, especially when going over bumps. Imprecise handling and uneven tire wear. The bushings in the control arms, sway bar links, and struts are susceptible to wear.
  • Solution: Replacement of worn bushings. In some cases, the entire control arm may need replacement if the bushings are not available separately or are too difficult to press in/out.
  • Estimated Cost to Fix: $200 - $800+ per corner, depending on the specific bushing and labor costs.
  • Recalls: None Found
• Front Strut Mount Failure
  • Description/Symptoms: Squeaking or popping noise when turning the steering wheel, especially at low speeds.
  • Solution: Replace the strut mounts and possibly the struts themselves.
  • Estimated Cost to Fix: $400 - $800 for both front struts and mounts.
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: The key may not be recognized, preventing the car from starting. The steering wheel may also lock.
  • Solution: Replacement of the EIS unit, which often requires programming by a Mercedes-Benz dealer or qualified specialist.
  • Estimated Cost to Fix: $800 - $1500+
  • Recalls: None Found
• Sunroof Issues
  • Description/Symptoms: Sunroof may get stuck open or closed, or may not operate smoothly.
  • Solution: Resetting the sunroof may fix the issue, but sometimes the motor needs to be replaced.
  • Estimated Cost to Fix: $100 - $600+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Issues
  • Description/Symptoms: Multiple electrical issues occurring at the same time, such as lights not working, wipers malfunctioning, or other electronic accessories failing. The SAM module controls many of the vehicle’s electrical functions.
  • Solution: Diagnosis and replacement of the faulty SAM module, which often requires programming.
  • Estimated Cost to Fix: $500 - $1200+
  • Recalls: None Found

Exterior

• Rust
  • Description/Symptoms: Surface rust on the vehicle.
  • Solution: Rust repair, sanding, filling, priming, and painting.
  • Estimated Cost to Fix: $100 - $1000+
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2009 Mercedes-Benz GLK350 can be a comfortable and luxurious compact SUV, but potential buyers should be aware of common issues that can arise. Engine oil leaks and transmission problems, particularly with the valve body, are relatively frequent and can be costly to repair. Electrical problems related to the EIS and SAM modules can also occur. Suspension bushing wear is also common as the vehicle ages. Overall, the GLK350 can be a rewarding vehicle to own, but a thorough inspection and diligent maintenance are crucial to minimize potential repair costs.