2018 Mercedes-Benz SLC43 AMG

The 2018 Mercedes-Benz SLC43 AMG is a sporty roadster that offers a blend of performance and luxury. It was only available with the 3.0L Bi-Turbo V6 engine, which produces 385 horsepower and 384 lb-ft of torque, and a 9G-Tronic 9-speed automatic transmission. Owners generally appreciate its nimble handling, powerful engine, and stylish design. Common dislikes include a somewhat cramped interior and the firm ride, which can be harsh on rough roads. The SLC43 does not have a gas-saving engine option available.

Engine

3.0L Bi-Turbo V6

• Oil Leaks from Valve Cover Gaskets
  • Description/Symptoms: Oil drips or puddles under the car, burning oil smell, visible oil residue on the engine.
  • Solution: Replace the valve cover gaskets.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Turbocharger Issues
  • Description/Symptoms: Whining noises, loss of power, check engine light.
  • Solution: Replacement of the Turbocharger
  • Estimated Cost to Fix: $2500 - $4000+
  • Recalls: None Found

Transmission

9G-Tronic 9-Speed Automatic

• Rough Shifting
  • Description/Symptoms: Harsh or jerky shifts, especially during downshifts or low-speed maneuvers. Hesitation when accelerating.
  • Solution: Transmission software update, or in more severe cases, valve body replacement.
  • Estimated Cost to Fix: $200 - $500 (software), $1500 - $3000+ (valve body)
  • Recalls: None Found
• Delayed Engagement
  • Description/Symptoms: Noticeable delay between shifting into drive or reverse and the car actually moving.
  • Solution: Check transmission fluid level and condition; may require a transmission flush or, in more serious cases, valve body replacement.
  • Estimated Cost to Fix: $200 - $400 (flush), $1500 - $3000+ (valve body)
  • Recalls: None Found

Suspension

• Air Suspension Issues (If Equipped)
  • Description/Symptoms: Vehicle sitting unevenly, compressor not working, error messages related to the suspension, rough ride.
  • Solution: Replacement of the air struts or air compressor.
  • Estimated Cost to Fix: $1000 - $2500+ per strut, $800 - $1500+ for the compressor
  • Recalls: None Found

Electrical

• COMAND System Malfunctions
  • Description/Symptoms: Freezing, Crashing, Unresponsive touchscreen, Bluetooth Connectivity issues.
  • Solution: Software update, or in some cases, replacement of the COMAND unit.
  • Estimated Cost to Fix: $100 - $300 (software), $1500 - $3000+ (unit replacement)
  • Recalls: None Found
• Battery Drain Issues
  • Description/Symptoms: Car failing to start after sitting for a short period, dead battery.
  • Solution: Diagnose parasitic draw, replace faulty module or component causing the drain.
  • Estimated Cost to Fix: $100 - $500+ (diagnosis and minor repairs), higher if a module needs replacement
  • Recalls: None Found

Exterior

• Convertible Top Issues
  • Description/Symptoms: Slow operation, failure to open or close completely, leaks.
  • Solution: Adjustment, lubrication, or replacement of hydraulic components (pump, cylinders, hoses).
  • Estimated Cost to Fix: $100 - $500+ (adjustment/lubrication), $500 - $2000+ (hydraulic components)
  • Recalls: None Found

Interior

• Seat Heater Malfunction
  • Description/Symptoms: Seat heater not working, excessive heat, or error message.
  • Solution: Replace faulty heating element or control module.
  • Estimated Cost to Fix: $300 - $800+
  • Recalls: None Found

Summary

The 2018 Mercedes-Benz SLC43 AMG, while a performance-oriented vehicle, exhibits several common issues that potential buyers should be aware of. The most frequently reported issues revolve around engine oil leaks, transmission shifting problems, and electrical system glitches. Suspension and convertible top concerns also arise. While some issues may be resolved with software updates, others require more significant and costly repairs, such as valve body replacements or turbocharger replacements. Overall, the vehicle has some minor issues but some of these can be expensive to repair if they do happen.