2019 Mercedes-Benz SLC300

The 2019 Mercedes-Benz SLC300 is a stylish and fun roadster, powered by a 2.0L turbocharged inline-4 engine producing 241 horsepower and 273 lb-ft of torque. Other engine options for this model year of the SLC included a 3.0L V6 biturbo engine in the SLC43 variant. It is offered exclusively with a 9-speed automatic transmission. Owners generally appreciate its sleek design, comfortable ride, and user-friendly technology. Common complaints include limited rear visibility with the top up, and the small trunk space is a tradeoff for the retractable hardtop.

Engine

2.0L Turbocharged Inline-4

• Oil Leaks
  • Description/Symptoms: Oil leaks may develop from the valve cover gasket or the oil filter housing. Signs of a leak include visible oil under the car, burning oil smell, and low oil levels.
  • Solution: Replace the valve cover gasket or oil filter housing gasket.
  • Estimated Cost to Fix: $200 - $600+ depending on the source of the leak and labor rates.
  • Recalls: None Found

Transmission

9-Speed Automatic (9G-Tronic)

• Rough Shifting
  • Description/Symptoms: Some owners have reported harsh or jerky shifts, particularly between lower gears. This can manifest as a noticeable lurch or hesitation during acceleration.
  • Solution: In some cases, a software update or recalibration of the transmission control module (TCM) can resolve the issue. In more severe cases, valve body replacement or transmission overhaul may be necessary.
  • Estimated Cost to Fix: $150 - $300+ for software updates/recalibration, $800 - $2,500+ for valve body replacement/overhaul.
  • Recalls: None Found

Suspension

No Issues Found

Electrical

• Battery Drain
  • Description/Symptoms: Some owners have reported instances of the car’s battery draining prematurely, especially when the vehicle is not driven frequently. This can lead to difficulty starting the car or requiring a jump start.
  • Solution: Diagnose the source of the parasitic drain. This might involve checking for faulty modules or components that are not shutting down properly. Replace the defective part or address the underlying cause of the drain.
  • Estimated Cost to Fix: $100 - $1,000+ depending on the source of the drain.
  • Recalls: None Found
• COMAND System Issues
  • Description/Symptoms: Freezing, lagging, or unresponsive behavior from the COMAND infotainment system.
  • Solution: Software update, replacement of the COMAND unit.
  • Estimated Cost to Fix: $100 - $200+ for software updates, $1,000+ for unit replacement
  • Recalls: None Found

Exterior

• Retractable Hardtop Malfunctions
  • Description/Symptoms: Issues with the operation of the retractable hardtop, including failure to open or close completely, unusual noises during operation, or error messages displayed on the instrument cluster.
  • Solution: The solution depends on the cause of the malfunction. This might involve lubricating the moving parts, replacing faulty sensors or hydraulic components, or recalibrating the system.
  • Estimated Cost to Fix: $200 - $2,000+ depending on the complexity of the repair.
  • Recalls: None Found

Interior

• Seat Heater Malfunction
  • Description/Symptoms: The seat heaters may fail to heat properly or stop working altogether.
  • Solution: Diagnose and replace the faulty heating element or control module.
  • Estimated Cost to Fix: $200 - $800+
  • Recalls: None Found

Summary

The 2019 Mercedes-Benz SLC300 generally has a decent reliability record, but potential buyers should be aware of potential issues. The retractable hardtop and electrical system are potential sources of problems, which can lead to moderately expensive repairs. While engine and transmission issues are reported, they are not extremely common. Overall, the SLC300 can be a rewarding vehicle to own, but a pre-purchase inspection by a qualified mechanic is highly recommended.