2017 Mercedes-Benz SLC43 AMG

The 2017 Mercedes-Benz SLC43 AMG is a sporty roadster, slotting in the lineup as a performance-oriented model within the SLC (formerly SLK) range. It came equipped with a 3.0-liter twin-turbocharged V6 engine producing 362 horsepower and 384 lb-ft of torque, paired with a 9G-TRONIC 9-speed automatic transmission. Drivers generally praise its agile handling, responsive engine, and luxurious interior. Common complaints revolve around its somewhat firm ride, limited cargo space, and infotainment system compared to newer models. The SLC range (including non-AMG models) also came with engine options such as the 1.8L inline-4 turbo and a 2.0L inline-4 turbo depending on the trim and market, however the AMG model was exclusive to the 3.0L V6.

Engine

3.0L Twin-Turbo V6 (M276)

• Oil Leaks from Turbocharger Oil Lines
  • Description/Symptoms: Oil leaks can occur from the turbocharger oil supply and return lines. This can manifest as visible oil drips, burning oil smell, and potentially low oil levels.
  • Solution: Replacing the faulty oil lines and gaskets.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Camshaft Adjuster Solenoid (Cam Magnet) Leaks
  • Description/Symptoms: Oil leaks from the camshaft adjuster solenoids (also known as cam magnets). This can lead to oil accumulating near the front of the engine and potentially affecting nearby sensors.
  • Solution: Replacing the leaking cam adjuster solenoid and cleaning up any oil residue.
  • Estimated Cost to Fix: $200 - $400+
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic (725.0)

• Rough Shifting or Hesitation
  • Description/Symptoms: Some owners have reported experiencing rough or jerky shifts, particularly during downshifts or when accelerating from a stop. This can also include hesitation between gear changes.
  • Solution: In some cases, a software update to the transmission control module (TCM) can address the issue. More severe cases may require valve body replacement or transmission rebuild.
  • Estimated Cost to Fix: $150 (Software Update) - $3,000+ (Valve Body/Rebuild)
  • Recalls: None Found

Suspension

• Air Suspension Issues (if equipped with Air Suspension)
  • Description/Symptoms: Models equipped with optional air suspension may experience issues such as sagging, uneven ride height, or failure to adjust properly. This can be caused by leaks in the air springs, a faulty compressor, or problems with the control module.
  • Solution: Replacing the leaking air spring, compressor, or control module.
  • Estimated Cost to Fix: $800 - $2,000+ per component
  • Recalls: None Found

Electrical

• Infotainment System Freezing/Crashing
  • Description/Symptoms: The COMAND infotainment system can occasionally freeze, crash, or become unresponsive.
  • Solution: A software update can sometimes resolve the issue. In some cases, the head unit may need to be replaced.
  • Estimated Cost to Fix: $150 (Software Update) - $1,500+ (Head Unit Replacement)
  • Recalls: None Found
• Sensor Failures (Parking Sensors, Blind Spot Monitoring, etc.)
  • Description/Symptoms: Various sensors, such as parking sensors or blind spot monitoring sensors, can fail, leading to error messages or system malfunction.
  • Solution: Replacing the faulty sensor.
  • Estimated Cost to Fix: $200 - $600+ per sensor
  • Recalls: None Found

Exterior

• Convertible Top Malfunctions
  • Description/Symptoms: The retractable hardtop convertible mechanism can experience issues such as getting stuck, failing to open or close completely, or making unusual noises. This could be due to hydraulic pump failure, sensor issues, or problems with the linkage.
  • Solution: Diagnosing the specific issue and repairing or replacing the faulty components.
  • Estimated Cost to Fix: $500 - $3,000+ depending on the issue.
  • Recalls: None Found

Interior

• Seat Heater Malfunctions
  • Description/Symptoms: The seat heaters may fail to function properly, either not heating at all or overheating. This is often due to a faulty heating element or control module.
  • Solution: Replacing the faulty heating element or control module.
  • Estimated Cost to Fix: $300 - $800+ per seat
  • Recalls: None Found

Summary: The 2017 Mercedes-Benz SLC43 AMG, while a desirable roadster, has some potential issues that owners should be aware of. Engine oil leaks from turbocharger lines and cam magnets are fairly common and can become costly if left unaddressed. Transmission issues such as rough shifting can range from minor software glitches to requiring major repairs. Electrical gremlins within the infotainment system and sensor failures can also be frustrating. Convertible top malfunctions can be costly. Overall, the severity and cost of potential repairs vary widely, but preventative maintenance and prompt attention to any developing issues can help mitigate long-term expenses.