2021 Mercedes-Benz G63 AMG

The 2021 Mercedes-Benz G63 AMG is a high-performance SUV known for its iconic boxy design, luxurious interior, and powerful engine. It comes equipped with a handcrafted 4.0-liter twin-turbocharged V8 engine producing 577 horsepower and 627 lb-ft of torque. While many owners praise its off-road capabilities, powerful performance, and distinctive styling, some common complaints revolve around its high price, fuel economy, and occasional electronic glitches.

Engine

4.0L Twin-Turbocharged V8

• Turbocharger Failure
  • Description/Symptoms: Whining noise from the engine bay, loss of power, check engine light.
  • Solution: Replacement of the faulty turbocharger(s).
  • Estimated Cost to Fix: $5,000 - $8,000+
• Oil Leaks
  • Description/Symptoms: Oil spots under the vehicle, burning oil smell, low oil level. Leaks often originate from valve cover gaskets, oil pan gasket, or turbocharger oil lines.
  • Solution: Replacing the leaking gaskets or lines.
  • Estimated Cost to Fix: $500 - $3,000+ depending on the location and severity of the leak.

Transmission

AMG SPEEDSHIFT TCT 9G 9-Speed Automatic

• Harsh Shifting
  • Description/Symptoms: Jerky or abrupt shifts, especially at lower speeds.
  • Solution: Software update (TCU reflash) or, in some cases, transmission valve body replacement.
  • Estimated Cost to Fix: $200 - $4,000+ depending on the severity of the issue and the required fix.
• Transmission Slipping
  • Description/Symptoms: The engine RPMs increase without a corresponding increase in speed, or the transmission fails to engage properly.
  • Solution: Fluid change to replacing or rebuilding the transmission.
  • Estimated Cost to Fix: $400 - $10,000+

Suspension

• Air Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, error message on the dashboard related to the air suspension system, compressor noise or failure.
  • Solution: Replacing the faulty air strut(s), air compressor, or air lines.
  • Estimated Cost to Fix: $2,000 - $6,000+ depending on the component that needs to be replaced.

Electrical

• Infotainment System Glitches
  • Description/Symptoms: Freezing, lagging, or crashing of the MBUX infotainment system; connectivity issues with Apple CarPlay or Android Auto.
  • Solution: Software update or, in some cases, replacement of the infotainment system unit.
  • Estimated Cost to Fix: $0 (if software update resolves the issue) - $2,000+ if hardware replacement is necessary.
• Sensor Malfunctions
  • Description/Symptoms: False warnings from driver-assistance systems (e.g., blind-spot monitoring, lane-keeping assist), parking sensor errors.
  • Solution: Replacing the faulty sensor(s).
  • Estimated Cost to Fix: $300 - $1,000+ per sensor.
• Battery Drain
  • Description/Symptoms: Vehicle battery draining quickly, especially when the vehicle is not in use.
  • Solution: Diagnosis and repair of parasitic drain. This could involve replacing the battery, faulty modules, or wiring.
  • Estimated Cost to Fix: $200 - $1,500+

Exterior

• No Issues Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, or making excessive noise.
  • Solution: Repair or replacement of the sunroof motor, tracks, or seals.
  • Estimated Cost to Fix: $500 - $2,000+

Recalls

• None Found

Summary

The 2021 Mercedes-Benz G63 AMG, while desirable for its performance and presence, can present owners with a range of issues. Engine and transmission problems can be costly, potentially ranging from a few hundred to over $10,000. Air suspension and electrical issues can also lead to significant repair bills. While some issues may be minor glitches, others can be more serious and require extensive repairs. Potential buyers should be aware of these potential issues and factor them into their ownership considerations.