2021 Mercedes-Benz C63 AMG

The 2021 Mercedes-Benz C63 AMG is a high-performance variant of the C-Class, known for its powerful engine and sporty driving dynamics. It came standard with a handcrafted 4.0-liter twin-turbo V8 engine producing 469 horsepower and 479 lb-ft of torque in the base C63, and 503 horsepower and 516 lb-ft of torque in the C63 S. Both versions utilize a nine-speed automatic transmission. Owners appreciate its exhilarating acceleration, aggressive styling, and luxurious interior. Common complaints include its firm ride, high fuel consumption, and complex electronics.

Engine

4.0L Twin-Turbo V8 (M177)

• Turbocharger Failure
  • Description/Symptoms: Whining noise from the turbochargers, loss of power, check engine light. Can be caused by oil starvation or bearing failure.
  • Solution: Replacement of the failed turbocharger(s).
  • Estimated Cost to Fix: $3,000 - $6,000+ per turbocharger
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: Oil puddles under the car, burning oil smell, low oil level warning. Common leak areas include valve cover gaskets, oil pan gasket, and turbocharger oil lines.
  • Solution: Replacement of the leaking gasket or seal.
  • Estimated Cost to Fix: $200 - $1,500+ depending on location
  • Recalls: None Found
• Spark Plug Issues
  • Description/Symptoms: Engine misfires, rough idle, reduced power, check engine light.
  • Solution: Spark plug replacement
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found

Transmission

9-Speed Automatic (AMG Speedshift MCT 9G)

• Rough Shifting/Hesitation
  • Description/Symptoms: Harsh or jerky shifts, especially during low-speed acceleration or deceleration. Hesitation when shifting between gears.
  • Solution: Software update, transmission fluid flush, or valve body replacement.
  • Estimated Cost to Fix: $200 - $3,000+ depending on the solution
  • Recalls: None Found
• Delayed Engagement
  • Description/Symptoms: Delay in engagement when shifting from Park or Neutral into Drive or Reverse.
  • Solution: Software update, or torque converter replacement.
  • Estimated Cost to Fix: $200 - $3,000+
  • Recalls: None Found

Suspension

• Air Suspension Issues (If Equipped)
  • Description/Symptoms: Vehicle leaning to one side, compressor failure, error messages on the dashboard.
  • Solution: Replacement of the air strut(s), compressor, or valve block.
  • Estimated Cost to Fix: $1,000 - $3,000+ per strut
  • Recalls: None Found
• Adaptive Damper Malfunctions
  • Description/Symptoms: Stiff or bouncy ride, error messages related to the adaptive damping system.
  • Solution: Replacement of the faulty damper(s).
  • Estimated Cost to Fix: $500 - $1,500+ per damper
  • Recalls: None Found

Electrical

• Infotainment System Glitches
  • Description/Symptoms: Freezing, crashing, slow response times, connectivity issues with Apple CarPlay or Android Auto.
  • Solution: Software update or replacement of the infotainment unit.
  • Estimated Cost to Fix: $0 - $2,000+
  • Recalls: None Found
• Sensor Failures
  • Description/Symptoms: Malfunctions with parking sensors, blind spot monitoring, or lane keep assist.
  • Solution: Replacement of the faulty sensor(s).
  • Estimated Cost to Fix: $200 - $800+ per sensor
  • Recalls: None Found
• Battery Drain
  • Description/Symptoms: Dead battery after short periods of inactivity, difficulty starting the engine.
  • Solution: Battery replacement, parasitic draw diagnosis and repair.
  • Estimated Cost to Fix: $200 - $500+ for battery replacement, $100+ for parasitic draw diagnosis
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Dashboard/Trim Squeaks and Rattles
  • Description/Symptoms: Annoying noises emanating from the dashboard or trim panels while driving.
  • Solution: Tightening or replacing loose fasteners, adding sound-deadening material.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found
• Seat Motor Malfunctions
  • Description/Symptoms: Seat not adjusting properly or at all, unusual noises when adjusting the seat.
  • Solution: Replacement of the seat motor or adjustment mechanism.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Summary

The 2021 Mercedes-Benz C63 AMG, while offering exhilarating performance, may present owners with various issues. Engine and transmission problems, particularly turbocharger failures and rough shifting, can be costly to address. Electrical glitches and suspension malfunctions are also potential concerns. While some issues are minor annoyances, others can be significant and expensive to repair, and should be noted by potential buyers.