2019 Mercedes-Benz SLC43 AMG

The 2019 Mercedes-Benz SLC43 AMG is a stylish and sporty roadster offering a blend of luxury and performance. Other engine options for the SLC class include the SLC300. The SLC43 AMG is powered by a 3.0L Biturbo V6 engine producing 385 horsepower and 384 lb-ft of torque, paired exclusively with a 9G-TRONIC 9-speed automatic transmission. Owners often praise its agile handling, powerful engine, and retractable hardtop, but some find the interior cramped and the ride quality firm.

Engine

3.0L Biturbo V6

• Turbocharger Failure
  • Description/Symptoms: Whining or whistling noise from the engine, reduced engine power, check engine light illuminated.
  • Solution: Replacement of the faulty turbocharger(s).
  • Estimated Cost to Fix: $2,500 - $4,500+
  • Recalls: None Found
• Oil Leaks (Valve Cover Gaskets/Oil Filter Housing)
  • Description/Symptoms: Visible oil leaks on the engine, burning oil smell, low oil level.
  • Solution: Replacement of the leaking valve cover gaskets or oil filter housing.
  • Estimated Cost to Fix: $300 - $1,500+
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic

• Rough Shifting/Hesitation
  • Description/Symptoms: Harsh or delayed shifts, particularly between certain gears, hesitation when accelerating.
  • Solution: Transmission software update, valve body replacement, or in severe cases, complete transmission replacement.
  • Estimated Cost to Fix: $200 (Software Update) - $7,000+ (Transmission Replacement)
  • Recalls: None Found
• Torque Converter Shudder
  • Description/Symptoms: A shaking or vibrating sensation, often felt at lower speeds or during light acceleration.
  • Solution: Replacement of the torque converter or transmission fluid flush.
  • Estimated Cost to Fix: $500 - $3,000+
  • Recalls: None Found

Suspension

• Air Suspension Issues (If equipped with optional Air Body Control)
  • Description/Symptoms: Vehicle sagging on one side, air compressor running constantly, ride height malfunction.
  • Solution: Replacement of the air strut(s) or air compressor.
  • Estimated Cost to Fix: $1,000 - $3,000+ per strut
  • Recalls: None Found

Electrical

• Battery Drain
  • Description/Symptoms: Car battery draining quickly, requiring frequent jump starts.
  • Solution: Diagnosis and repair of the parasitic draw causing the drain (e.g., faulty module, aftermarket accessory).
  • Estimated Cost to Fix: $100 - $1,000+
  • Recalls: None Found
• COMAND System Malfunctions
  • Description/Symptoms: Freezing, crashing, or unresponsive COMAND infotainment system.
  • Solution: Software update, replacement of the COMAND unit.
  • Estimated Cost to Fix: $200 (Software Update) - $2,000+ (COMAND Unit Replacement)
  • Recalls: None Found

Exterior

• Convertible Top Issues
  • Description/Symptoms: The convertible hardtop failing to open or close properly, getting stuck mid-cycle, or making unusual noises.
  • Solution: Diagnosis of hydraulic system, sensors, or latches, and repair or replacement of faulty components.
  • Estimated Cost to Fix: $300 - $2,000+
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2019 Mercedes-Benz SLC43 AMG, while generally reliable, does have some potential issues. Engine and transmission problems, while not universally experienced, can be costly to repair. Electrical gremlins and suspension issues (if equipped with air suspension) are also areas to be aware of. Overall, potential buyers should be aware of the possibility of these issues and factor in potential repair costs when considering the purchase of a used SLC43 AMG. The severity of these issues range from minor inconveniences to major mechanical failures, and the cost of repairs can vary significantly depending on the specific issue and the repair shop.