2021 Mercedes-Benz OC 500

The 2021 Mercedes-Benz GLC 300 is a luxury compact SUV that blends performance with elegance. It’s generally praised for its comfortable ride, upscale interior, and user-friendly technology. However, some common criticisms include a higher price point compared to competitors and some reported issues with the infotainment system. The GLC 300 comes standard with a 2.0L turbocharged inline-4 engine producing 255 horsepower and 273 lb-ft of torque, paired with a 9G-TRONIC 9-speed automatic transmission. Other engine options include the AMG enhanced 3.0L V6 Biturbo with higher horsepower.

Electric Motor

No Issues Found

Transmission

9G-TRONIC 9-Speed Automatic Transmission

• Harsh or Delayed Shifting
  • Description/Symptoms: Some owners have reported experiencing harsh or delayed shifts, particularly between lower gears. This can manifest as a noticeable “clunk” or hesitation during acceleration.
  • Solution: In some cases, a software update to the transmission control module (TCM) can resolve the issue. If the problem persists, more extensive diagnostics may be required, possibly including valve body inspection and repair or replacement.
  • Estimated Cost to Fix: $300 - $2,000+
  • Recalls: None Found

Suspension

• Air Suspension Malfunctions (if equipped)
  • Description/Symptoms: Some GLC 300 models are equipped with air suspension. Reported issues include air leaks, uneven ride height, and suspension warning lights appearing on the dashboard.
  • Solution: Diagnosis is required to identify the leaking component (air strut, compressor, or air lines). Replacement of the faulty part is usually the fix.
  • Estimated Cost to Fix: $800 - $2,500+
  • Recalls: None Found

Electrical

• MBUX Infotainment System Glitches
  • Description/Symptoms: The MBUX system can experience a variety of glitches, including freezing, lagging, screen blackouts, and connectivity issues with Apple CarPlay or Android Auto.
  • Solution: A software update is often the first step in addressing MBUX issues. If that doesn’t work, a system reset or module replacement may be necessary.
  • Estimated Cost to Fix: $0 (software update) - $1,500+ (module replacement)
  • Recalls: None Found
• Sensor Failures (parking sensors, blind spot monitoring)
  • Description/Symptoms: Malfunctioning sensors can lead to false alerts or complete failure of the associated safety system. This can include parking sensors, blind spot monitoring, lane keep assist, and pre-safe braking.
  • Solution: Diagnosis to identify the faulty sensor. Replacement of the sensor is the typical fix.
  • Estimated Cost to Fix: $200 - $800+ per sensor
  • Recalls: None Found

Exterior

• Panoramic Sunroof Issues
  • Description/Symptoms: Reports of the panoramic sunroof making excessive creaking noises when opening/closing or while driving. In some cases, the sunroof may stick or fail to close completely.
  • Solution: Lubrication of the sunroof tracks and seals is often the first step. More extensive repairs may involve replacing the sunroof motor or the entire sunroof assembly.
  • Estimated Cost to Fix: $100 - $2,000+
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2021 Mercedes-Benz GLC 300 has a few common issues that owners have reported. The most prevalent issues are related to the 9-speed transmission, electrical systems, and panoramic sunroof. The cost of repairs can range from relatively minor software updates to more substantial component replacements, potentially reaching several thousand dollars, especially for air suspension or MBUX system issues. It’s important to note that these issues don’t affect every vehicle, and a thorough inspection by a qualified mechanic is recommended before making a purchase.