2020 Mercedes-Benz GLC63 AMG S

The 2020 Mercedes-Benz GLC63 AMG S is a high-performance compact SUV that offers exhilarating performance and luxurious features. The GLC63 AMG S is equipped with a handcrafted 4.0L V8 biturbo engine that produces 503 hp and 516 lb-ft of torque, paired with a 9-speed automatic AMG Speedshift MCT transmission. While enthusiasts praise its powerful engine, agile handling, and upscale interior, some common complaints revolve around its firm ride, high price, and complex infotainment system.

Engine

4.0L V8 Biturbo

• Turbocharger Failure
  • Description/Symptoms: Whining noises from the engine bay, loss of power, check engine light.
  • Solution: Replacement of the turbocharger(s).
  • Estimated Cost to Fix: $3,000 - $6,000+
  • Recalls: None Found
• Oil Leaks (Valve Cover Gaskets)
  • Description/Symptoms: Oil spots under the vehicle, burning oil smell, visible oil around the valve covers.
  • Solution: Replacement of the valve cover gaskets.
  • Estimated Cost to Fix: $500 - $1,500
  • Recalls: None Found
• Coolant Leaks (Water Pump)
  • Description/Symptoms: Coolant leaks under the car, low coolant level warning light, engine overheating.
  • Solution: Replace the water pump.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found

Transmission

AMG Speedshift MCT 9-Speed Automatic

• Rough Shifting
  • Description/Symptoms: Harsh or jerky shifts, especially during low-speed operation or when downshifting.
  • Solution: Software update to the transmission control unit (TCU) or replacement of valve body.
  • Estimated Cost to Fix: $300 - $2,000+
  • Recalls: None Found
• Delayed Engagement
  • Description/Symptoms: A noticeable delay between shifting into drive or reverse and the vehicle actually moving.
  • Solution: Transmission service, software update, or valve body replacement.
  • Estimated Cost to Fix: $300 - $2,000+
  • Recalls: None Found

Suspension

• Air Suspension Issues (if equipped)
  • Description/Symptoms: Vehicle leaning to one side, inability to adjust ride height, “Vehicle Level Too Low” warning.
  • Solution: Replacement of air struts, compressor, or air lines.
  • Estimated Cost to Fix: $1,500 - $4,000+
  • Recalls: None Found

Electrical

• MBUX Infotainment System Glitches
  • Description/Symptoms: System freezing, screen going black, unresponsive touchscreen, Bluetooth connectivity problems.
  • Solution: Software updates, system resets, or replacement of the MBUX unit.
  • Estimated Cost to Fix: $0 (software update) - $2,000+
  • Recalls: None Found
• Sensor Malfunctions (Parking Sensors, Blind Spot Monitoring)
  • Description/Symptoms: False alarms, failure to detect objects, warning lights.
  • Solution: Replacement of the faulty sensor.
  • Estimated Cost to Fix: $300 - $800+ per sensor
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Creaking/Rattling Noises
  • Description/Symptoms: Annoying creaks or rattles emanating from the dashboard, door panels, or rear hatch area.
  • Solution: Tightening of fasteners, application of felt tape to contact points.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Summary

The 2020 Mercedes-Benz GLC63 AMG S, while a performance marvel, is not without its potential issues. Engine-related problems, such as turbocharger failure and oil leaks, can be expensive to address. Transmission issues like rough shifting can diminish the driving experience. Electrical glitches with the MBUX system and sensors are frustrating. While some issues are relatively minor, others can lead to substantial repair costs. Potential buyers should be aware of these common problems and ensure a thorough inspection before purchasing a used GLC63 AMG S.