2020 Mercedes-Benz CLS450

The 2020 Mercedes-Benz CLS450 is a stylish four-door coupe known for its sleek design and luxurious features. The CLS450 is powered by a 3.0-liter turbocharged inline-6 engine with EQ Boost, producing 362 horsepower and 369 lb-ft of torque. Other engine options for the 2020 CLS class include the AMG CLS53, which features a more powerful version of the inline-6 engine. All engines are paired with a 9G-TRONIC 9-speed automatic transmission. Owners generally appreciate the CLS450’s comfortable ride, elegant interior, and advanced technology. Some common complaints include the rear headroom limitations due to the sloping roofline, the complexity of the infotainment system, and the higher maintenance costs associated with Mercedes-Benz vehicles.

Engine

3.0L Turbocharged Inline-6 (M256)

• Failed Auxiliary Water Pump
  • Description/Symptoms: Overheating engine, loss of coolant, “Check Engine” light illuminated. The auxiliary water pump, part of the EQ Boost system, fails prematurely.
  • Solution: Replacement of the auxiliary water pump.
  • Estimated Cost to Fix: $500 - $800+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil spots under the car, burning oil smell, low oil level warning. Oil leaks are found around the valve cover gasket or oil filter housing.
  • Solution: Replacement of the valve cover gasket or oil filter housing gasket.
  • Estimated Cost to Fix: $200 - $600+
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic (725.0)

• Rough Shifting/Hesitation
  • Description/Symptoms: Harsh or delayed shifts, particularly between lower gears. Hesitation during acceleration or when downshifting.
  • Solution: Software update or replacement of valve body. In more severe cases, transmission replacement may be required.
  • Estimated Cost to Fix: $300 - $1,000+ for software update or valve body. $5,000 - $8,000+ for transmission replacement.
  • Recalls: None Found

Suspension

• Air Suspension Malfunctions (If Equipped)
  • Description/Symptoms: Vehicle sagging on one or more corners, “Vehicle Level Too Low” warning, failure of the air compressor.
  • Solution: Replacement of the affected air strut, air compressor, or associated components.
  • Estimated Cost to Fix: $1,000 - $2,500+ per strut, $800 - $1,500+ for compressor.
  • Recalls: None Found

Electrical

• Infotainment System Freezing/Crashing
  • Description/Symptoms: The MBUX infotainment system freezes, restarts unexpectedly, or displays error messages. Navigation malfunctions, Bluetooth connectivity issues.
  • Solution: Software update or replacement of the infotainment system module.
  • Estimated Cost to Fix: $0 - $300 for software update. $1,000 - $3,000+ for module replacement.
  • Recalls: None Found
• Sensor Malfunctions
  • Description/Symptoms: Malfunction of sensors such as parking sensors and blind spot monitoring system. Warning lights appear on the dashboard.
  • Solution: Replacement of faulty sensors.
  • Estimated Cost to Fix: $200 - $500+ per sensor.
  • Recalls: None Found
• EQ Boost System Issues
  • Description/Symptoms: Failure of the EQ Boost system due to faulty wiring or components. “Check Engine” light illuminated.
  • Solution: Replacement of faulty EQ Boost system components or rewiring.
  • Estimated Cost to Fix: $500 - $2,000+
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof jamming, failing to open or close properly, or leaking water.
  • Solution: Cleaning and lubrication of the sunroof tracks or replacement of the sunroof motor or seals.
  • Estimated Cost to Fix: $100 - $800+
  • Recalls: None Found

Interior

• No Issues Found

Summary The 2020 Mercedes-Benz CLS450 can experience issues across various systems, including engine, transmission, suspension, and electrical components. The issues can vary in severity, from minor sensor malfunctions to more significant problems like transmission issues or air suspension failures. Repair costs can range from a few hundred dollars for simple fixes to several thousand for major repairs, potentially making maintenance expensive over the long term. The electrical issues with the MBUX infotainment system are common, but can usually be fixed with software updates.