2012 Mercedes-Benz GLK300

The 2012 Mercedes-Benz GLK300 is a compact luxury SUV known for its boxy styling, comfortable ride, and solid build quality. The GLK300 is equipped with a 3.5-liter V6 engine producing 268 horsepower and 258 lb-ft of torque, paired with a 7-speed automatic transmission. Some owners appreciate its practicality, fuel economy for its class, and the prestige of the Mercedes-Benz brand. Conversely, some criticisms include a somewhat firm ride, dated interior styling, and higher maintenance costs compared to non-luxury SUVs.

Engine

3.5L V6

• Camshaft Adjuster Solenoid (Camshaft Magnet) Failure
  • Description/Symptoms: Check engine light activation, rough idling, decreased fuel economy, and potential engine misfires. This is often related to oil leaks affecting the solenoid.
  • Solution: Replacing the faulty camshaft adjuster solenoid.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil spots under the vehicle, burning oil smell, low oil level warning. Common leak locations include valve cover gaskets, oil filter housing, and the rear main seal.
  • Solution: Replacing the leaking gasket or seal.
  • Estimated Cost to Fix: $150 - $1000+, depending on the location of the leak.
  • Recalls: None Found

Transmission

7-Speed Automatic (7G-Tronic)

• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, slipping between gears, erratic shifting behavior, and potential limp mode activation.
  • Solution: Replacing or rebuilding the valve body. Sometimes a software update can resolve minor issues.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibration at low speeds, especially during acceleration, transmission slipping, and potential stalling.
  • Solution: Replacing the torque converter.
  • Estimated Cost to Fix: $1,200 - $2,500+
  • Recalls: None Found

Suspension

• Front Lower Control Arm Bushing Failure
  • Description/Symptoms: Clunking noise from the front suspension, especially when going over bumps, loose or imprecise steering, and uneven tire wear.
  • Solution: Replacing the front lower control arms or just the bushings if possible.
  • Estimated Cost to Fix: $300 - $800+ per side.
  • Recalls: None Found
• Rear Air Suspension Issues (If Equipped)
  • Description/Symptoms: Vehicle sagging in the rear, especially overnight, air compressor running constantly, and “Visit Workshop” message related to the suspension.
  • Solution: Replacing the air struts, air compressor, or associated air lines.
  • Estimated Cost to Fix: $800 - $2,000+ per strut or compressor.
  • Recalls: None Found

Electrical

• Electronic Steering Lock (ESL) Failure
  • Description/Symptoms: Key not recognized, vehicle not starting, steering wheel locked, and an error message displayed on the instrument cluster.
  • Solution: Replacing or repairing the electronic steering lock module.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found
• Battery Drain Issues
  • Description/Symptoms: Dead battery, especially after the vehicle has been sitting for a few days. This is often caused by a faulty module or relay that is not shutting off properly.
  • Solution: Diagnosing and repairing the faulty module or relay causing the drain.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Exterior

• Rust on Subframe
  • Description/Symptoms: Visible rust spots on the chassis or subframe, indicating corrosion. This can be more prevalent in areas with harsh winters and road salt.
  • Solution: Addressing rust is either rust repair or replacing the subframe.
  • Estimated Cost to Fix: $500-$2000
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof sticking, making excessive noise, or failing to open/close properly.
  • Solution: Cleaning and lubricating the sunroof tracks, or replacing the sunroof motor or regulator.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found
• Command System Malfunctions
  • Description/Symptoms: The COMAND system (infotainment) freezing, crashing, or not responding to inputs.
  • Solution: Software updates, or replacement of the COMAND unit.
  • Estimated Cost to Fix: $200 - $1500+
  • Recalls: None Found

Summary

The 2012 Mercedes-Benz GLK300 can be a reliable vehicle, but owners should be aware of potential issues. Engine oil leaks and transmission valve body problems are among the more prevalent and costly repairs. Electrical glitches and suspension component wear are also common concerns. Overall, while the GLK300 offers a luxurious driving experience, potential buyers should factor in the possibility of higher-than-average maintenance costs and carefully inspect the vehicle for signs of these common issues before purchasing.