2020 Mercedes-Benz SLC43 AMG

The 2020 Mercedes-Benz SLC43 AMG is a stylish and sporty roadster that blends luxury with performance. It features a 3.0-liter twin-turbo V6 engine producing 385 horsepower and 384 lb-ft of torque, paired with a 9G-TRONIC 9-speed automatic transmission. There were no other engine options available. Drivers often praise its agile handling, refined interior, and responsive engine. Some criticisms include a firm ride and limited cargo space.

Engine

3.0L Twin-Turbo V6

• Turbocharger Failure
  • Description/Symptoms: Whining noise from the engine bay, loss of power, check engine light.
  • Solution: Turbocharger replacement.
  • Estimated Cost to Fix: $2,500 - $4,000+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil spots under the car, burning oil smell, low oil level warning. Often occurs around the valve cover gaskets or oil filter housing.
  • Solution: Replace leaking gaskets and seals.
  • Estimated Cost to Fix: $200 - $1,500+ (depending on the location and severity)
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic

• Rough Shifting/Hesitation
  • Description/Symptoms: Jerky shifts, especially between lower gears, hesitation when accelerating, transmission slipping.
  • Solution: Software update, valve body replacement, or complete transmission replacement in severe cases.
  • Estimated Cost to Fix: $300 - $6,000+ (depending on the solution)
  • Recalls: None Found
• Torque Converter Issues
  • Description/Symptoms: Shuddering during light acceleration, especially at low speeds.
  • Solution: Torque converter replacement.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found

Suspension

• Air Suspension Malfunctions (If Equipped)
  • Description/Symptoms: Vehicle leaning to one side, suspension not adjusting properly, error message on the dashboard.
  • Solution: Repair or replacement of air struts, air compressor, or related sensors.
  • Estimated Cost to Fix: $800 - $2,500+ (per component)
  • Recalls: None Found

Electrical

• COMAND System Freezing/Crashing
  • Description/Symptoms: Infotainment system freezes, reboots unexpectedly, or becomes unresponsive.
  • Solution: Software update, replacement of the COMAND unit in severe cases.
  • Estimated Cost to Fix: $200 - $2,000+
  • Recalls: None Found
• Sensor Failures (e.g., Parking Sensors, Blind Spot Monitoring)
  • Description/Symptoms: Warning lights on the dashboard, malfunctioning driver-assistance systems.
  • Solution: Replacement of faulty sensors.
  • Estimated Cost to Fix: $200 - $800+ (per sensor)
  • Recalls: None Found

Exterior

• Retractable Hardtop Issues
  • Description/Symptoms: Roof failing to open or close properly, unusual noises during operation, error messages.
  • Solution: Adjustment, lubrication, or replacement of hydraulic components or sensors related to the roof mechanism.
  • Estimated Cost to Fix: $500 - $3,000+
  • Recalls: None Found

Interior

• Seat Motor Failure
  • Description/Symptoms: Seat will not move in one or more directions.
  • Solution: Seat motor replacement.
  • Estimated Cost to Fix: $400 - $1,200+
  • Recalls: None Found

Summary

The 2020 Mercedes-Benz SLC43 AMG, while generally reliable, can experience some issues. Engine and transmission problems, particularly related to the turbochargers, oil leaks, and rough shifting, are notable concerns. The retractable hardtop and electrical systems can also be problematic. Repair costs can range from a few hundred dollars for minor sensor replacements to several thousand for major engine or transmission work. While not overwhelmingly common, these issues should be considered by potential buyers.