2021 Mercedes-Benz GLC63 AMG

The 2021 Mercedes-Benz GLC63 AMG is a performance SUV that blends luxury with raw power. It’s available in both standard SUV and coupe body styles, offering a distinct aesthetic. While the GLC lineup features other engines such as a 2.0L turbo 4 cylinder, and other AMG variants with slightly lower outputs, the GLC63 AMG boasts a hand-built 4.0-liter twin-turbo V8 engine producing 469 horsepower and 479 lb-ft of torque. The AMG-enhanced SPEEDSHIFT MCT 9-speed transmission is standard. Owners often praise the GLC63 AMG for its blistering acceleration, agile handling, and luxurious interior. However, some common complaints revolve around the firm ride quality, high fuel consumption, and the complex infotainment system.

Engine

4.0L Twin-Turbo V8

• Turbocharger Failure
  • Description/Symptoms: Whining or screeching noise from the engine, loss of power, check engine light. Often related to oil starvation or bearing failure within the turbocharger.
  • Solution: Replacement of the failed turbocharger(s). Oil lines should also be inspected for blockages.
  • Estimated Cost to Fix: $3,000 - $6,000+ (per turbocharger, depending on location and parts used)
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Visible oil leaks under the vehicle, burning oil smell, low oil level. Common leak points include valve cover gaskets, oil pan gasket, and rear main seal.
  • Solution: Replacement of the leaking gasket or seal. Proper cleaning of the affected area.
  • Estimated Cost to Fix: $200 - $1,500+ (depending on the location of the leak)
  • Recalls: None Found

Transmission

AMG SPEEDSHIFT MCT 9-Speed Automatic

• Rough or Delayed Shifting
  • Description/Symptoms: Harsh shifts between gears, noticeable delay in shifting, especially during acceleration or deceleration.
  • Solution: Software update (TCU reflash) to address shifting logic, valve body replacement.
  • Estimated Cost to Fix: $200 - $400 (for software update), $1,500 - $3,000+ (for valve body replacement)
  • Recalls: None Found

Suspension

• Air Suspension Issues (If Equipped)
  • Description/Symptoms: Vehicle sitting unevenly, compressor failing to maintain ride height, warning lights on the dash related to the air suspension system.
  • Solution: Replacement of faulty air struts, air compressor, or height sensors. Checking for leaks in the air lines.
  • Estimated Cost to Fix: $800 - $3,000+ (depending on the component and location)
  • Recalls: None Found

Electrical

• MBUX Infotainment System Glitches
  • Description/Symptoms: System freezing, lagging response to inputs, screen blacking out, connectivity issues with Bluetooth or Apple CarPlay/Android Auto.
  • Solution: Software update to the MBUX system, replacement of the head unit (in severe cases).
  • Estimated Cost to Fix: $0 (for software update), $1,000 - $3,000+ (for head unit replacement)
  • Recalls: None Found
• Sensor Malfunctions (Parking Sensors, Blind Spot Monitoring, etc.)
  • Description/Symptoms: False alarms, system inoperative, error messages on the dash.
  • Solution: Replacement of the faulty sensor(s). Recalibration of the system.
  • Estimated Cost to Fix: $200 - $800+ (per sensor, depending on location and complexity)
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Creaking or Rattling Noises
  • Description/Symptoms: Annoying noises coming from the dashboard, door panels, or seats, especially when driving on rough roads.
  • Solution: Identifying the source of the noise and tightening loose fasteners, adding felt or foam to prevent friction between components.
  • Estimated Cost to Fix: $100 - $500+ (depending on the severity and complexity of the issue)
  • Recalls: None Found

Summary

The 2021 Mercedes-Benz GLC63 AMG, while offering exhilarating performance and luxury, can present owners with several potential issues. Engine and transmission concerns, particularly related to the turbochargers, oil leaks, and transmission shifting, can lead to significant repair costs. Electrical issues, especially with the MBUX system and sensors, are also relatively common. While some issues may be minor and easily resolved with software updates or sensor replacements, others can be more serious and require costly component replacements. Overall, the severity and cost of potential issues vary, but prospective buyers should be aware of these common complaints and factor them into their purchasing decision.