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The Mercedes G-Class W463 G 63 AMG is one of the most recognizable high-performance luxury SUVs in the world. With its handcrafted AMG 4.0L V8 Biturbo engine, aggressive styling, and off-road capability, the G 63 AMG represents the pinnacle of power and prestige.
However, despite its rugged build and premium engineering, the vehicle is not immune to mechanical and electrical issues. Owners of the G 63 AMG frequently encounter a variety of problems that affect performance, reliability, and long-term ownership costs.
This article explores the most common issues that owners and potential buyers should be aware of. Understanding these problems can help prevent costly repairs and ensure a smooth ownership experience.
Mercedes G-Class W463 G 63 AMG Engine and Performance Issues
The Mercedes G 63 AMG is powered by a twin-turbocharged 4.0L V8 engine (M177) that delivers 577 horsepower and 627 lb-ft of torque. While this engine is a powerhouse, it has a reputation for specific weaknesses that can lead to expensive repairs.
One of the most common issues with the M177 engine is excessive oil consumption. Many owners report that their G 63 AMG consumes more oil than expected, requiring frequent top-ups between service intervals.
This can be attributed to turbocharger wear, piston ring design, or valve seal degradation.
Ignoring oil consumption problems can lead to premature engine wear, low oil pressure, and potential engine failure.
Turbocharger failures are another known problem with the G 63 AMG’s twin-turbo V8. The high boost pressure and extreme heat generated by the turbochargers put significant stress on the turbo bearings and seals. Over time, turbo seals may leak, leading to oil contamination in the intake system and reduced performance.
Some owners experience turbo lag, excessive smoke from the exhaust, and power loss, indicating turbo failure.
Regular oil changes with high-quality synthetic oil and proper turbo cooling after spirited driving can help prolong turbo lifespan.
Another concern is engine overheating, which is often caused by cooling system inefficiencies. The G 63 AMG’s radiator and intercoolers are critical for maintaining optimal engine temperature, but issues such as clogged coolant passages, failing water pumps, and weak radiator fans can lead to overheating.
Some owners experience coolant leaks due to failing plastic radiator tanks or cracked hoses.
Overheating in a turbocharged engine can result in catastrophic damage, making regular coolant system maintenance essential.
The timing chain and tensioners in the M177 engine are also known to wear prematurely. A failing timing chain tensioner can cause a rattling noise at startup, poor engine performance, and, in severe cases, complete engine failure.
Replacing the timing chain components before failure is crucial to preventing expensive engine repairs.
Mercedes G-Class W463 G 63 AMG Transmission and Drivetrain Problems
The Mercedes G 63 AMG is equipped with a 9-speed AMG Speedshift TCT automatic transmission, which offers fast and smooth shifting. However, despite its advanced technology, this transmission is not without its faults.
A common issue with the 9-speed automatic transmission is harsh or delayed shifting. Some owners experience jerky gear changes, hesitation when accelerating, or difficulty downshifting.
This is often caused by transmission fluid degradation, faulty valve bodies, or worn clutch packs.
In some cases, a software update from Mercedes-Benz can resolve shifting problems, but mechanical wear can necessitate transmission fluid changes and component replacement.
The torque converter in the G 63 AMG can also develop problems over time.
Symptoms of a failing torque converter include vibrations, shuddering, and slipping under acceleration.
If left unchecked, a failing torque converter can lead to increased transmission wear and costly repairs.
The transfer case in the G 63 AMG’s full-time all-wheel-drive system is another weak point. Owners report transfer case noise, fluid leaks, and difficulty engaging low-range mode.
The transfer case relies on regular fluid changes to prevent excessive wear, and worn-out actuator motors may need replacement to restore full 4WD functionality.
Differential issues are also a concern, especially for owners who use the G 63 AMG’s off-road capabilities. The front and rear differentials require frequent fluid changes, and excessive stress on the drivetrain can lead to leaking seals, differential whine, or gear damage.
Mercedes recommends servicing the differential fluids every 30,000 miles to extend component life.
Mercedes G-Class W463 G 63 AMG Suspension and Steering Issues
Despite its rugged construction, the G 63 AMG’s suspension system has several known weaknesses.
One of the most common complaints is air suspension failure. The AMG Ride Control adaptive air suspension delivers an exceptionally smooth ride, but air struts and compressors frequently fail.
A failing air suspension system can cause the vehicle to sag, ride unevenly, or display suspension fault warnings on the dashboard.
The most common reasons for air suspension failure include leaking air struts, worn-out air springs, and compressor failure.
Some owners opt to replace the factory air suspension with traditional coil springs to avoid future repair costs.
The steering system is another weak area in the G 63 AMG. Many owners report steering vibrations, excessive play in the steering wheel, and misalignment issues.
This is often due to worn tie rod ends, ball joints, or steering dampers.
Given the G 63 AMG’s weight and power, suspension and steering components endure significant stress, making regular inspections and proactive replacements necessary.
Power steering leaks are also common, particularly from the power steering pump and hose connections. If the power steering fluid level drops, owners may experience heaviness in steering and inconsistent response.
Keeping an eye on fluid levels and replacing worn-out seals can prevent long-term damage.
This is the first half of the article on Common Problems of Mercedes G-Class W463 G 63 AMG. The second half will cover brake system issues, electrical malfunctions, body rust, interior wear, and fuel system problems, followed by a conclusion with your service center’s details. Stay tuned for the next response.
Mercedes G-Class W463 G 63 AMG Brake System Issues
The Mercedes G 63 AMG is a high-performance SUV that demands a strong braking system to handle its power and weight.
However, many owners report premature brake wear and overheating issues, which can lead to reduced stopping power.
One of the most common complaints is brake rotor warping.
Due to the G 63 AMG’s heavy weight and aggressive driving style, the brake rotors tend to overheat and warp over time.
This leads to vibrations when braking, reduced braking efficiency, and pulsation in the brake pedal.
Warped rotors require resurfacing or complete replacement, making it crucial to use high-performance brake components that can withstand heat.
Brake pad wear is another frequent issue. AMG models use high-friction brake pads for maximum stopping power, but they wear out faster than standard brake pads.
Some owners find themselves replacing their brake pads every 10,000 to 15,000 miles, depending on driving style.
The Brembo brake calipers used in the G 63 AMG provide excellent performance but can sometimes develop sticking issues, leading to uneven brake wear and overheating.
Brake fluid contamination is also a problem in the G 63 AMG.
Over time, moisture can enter the brake fluid, reducing braking efficiency and causing a spongy brake pedal feel.
Regular brake fluid flushes are necessary to maintain optimal braking performance and safety.
Mercedes G-Class W463 G 63 AMG Electrical and Electronic Malfunctions
Like most modern luxury vehicles, the G 63 AMG is equipped with a complex electronic system, which can sometimes be prone to malfunctions.
Many owners experience issues with the infotainment system, instrument cluster, and safety features.
One of the most reported issues is infotainment system failure. The G 63 AMG’s COMAND system, which controls navigation, media, and vehicle settings, is known to freeze, lag, or fail entirely.
Some owners experience black screens, unresponsive touch controls, or Bluetooth connectivity issues.
These problems may require software updates, reboots, or complete replacement of the infotainment unit.
Dashboard warning lights are another concern. Many G 63 AMG owners report frequent warning messages, including ABS, traction control, and suspension system errors. While some warnings may be triggered by sensor malfunctions, others indicate serious mechanical or electrical failures.
Common culprits include faulty wheel speed sensors, bad battery voltage regulators, and failing ECU components.
Battery drain is another issue that frustrates G 63 AMG owners. Due to the high number of electronic features, including automatic start/stop, air suspension, and advanced lighting systems, the vehicle’s battery tends to drain quickly.
Some owners find that their G 63 AMG struggles to start after being parked for a few days.
Using a battery tender or upgrading to a high-performance AGM battery can help mitigate this issue.
Mercedes G-Class W463 G 63 AMG Body and Rust Problems
Despite its military-inspired durability, the G 63 AMG is not immune to rust issues, particularly in cold climates where road salt is used.
The underbody and frame are some of the most rust-prone areas. The G-Class chassis is built with high-strength steel, but poor drainage and exposure to moisture lead to corrosion, especially around the suspension mounts, exhaust system, and frame welds.
Owners who drive in wet or snowy conditions should regularly wash the undercarriage and apply rust-proofing treatments.
Another common rust-prone area is the rear door and tailgate. Water tends to accumulate near the spare tire mount, rear hinges, and lower tailgate panel, leading to paint bubbling and corrosion over time.
Some owners also report rust formation around door hinges and wheel arches, particularly in older models or vehicles that have sustained minor body damage.
The G 63 AMG’s exterior trim and seals can also degrade over time. The rubber window and door seals may develop cracks or shrinkage, leading to water leaks into the cabin.
This can cause mold growth, electrical failures, and musty odors inside the G-Class interior.
Keeping rubber seals lubricated and replacing them when worn out can prevent water damage.
Mercedes G-Class W463 G 63 AMG Interior and Comfort Issues
The G 63 AMG’s interior is known for its premium materials and craftsmanship, but some components can wear out prematurely.
One of the most frequently reported issues is seat bolster wear. The G-Class seats, especially those in Nappa leather or Designo leather, tend to show signs of cracking, fading, or tearing over time. The side bolsters experience the most stress, as drivers frequently slide in and out of the tall cabin.
Regular conditioning of the leather can help prevent premature aging and cracking.
Interior rattles and creaks are another common complaint. Despite its solid construction, the G 63 AMG’s dashboard, door panels, and center console may develop annoying rattling noises, particularly after prolonged use on rough roads.
These noises can often be traced to loose trim clips, plastic panel expansion, or worn-out interior fasteners.
The heated and ventilated seat functions are also known to fail over time. Some owners report inconsistent heating, weak cooling fans, or complete failure of the seat climate control system.
This is typically caused by electrical malfunctions or clogged ventilation ducts, requiring repairs at Mercedes service centers.
Mercedes G-Class W463 G 63 AMG Fuel System and Exhaust Issues
The G 63 AMG’s fuel system plays a critical role in its performance and efficiency, but some owners experience problems with fuel delivery and emissions control systems.
One of the most common issues is fuel injector failure. The direct injection system in the M177 engine is prone to carbon buildup, leading to clogged fuel injectors, misfires, and rough idling.
Many owners experience reduced fuel efficiency and sluggish acceleration due to injector problems.
Performing regular fuel system cleanings and using high-quality fuel can help prevent these issues.
Exhaust system failures are another concern, particularly with catalytic converters and exhaust manifold cracks.
Due to the extreme heat generated by the twin-turbo V8, the exhaust manifolds may develop cracks, leading to excessive noise and power loss.
Additionally, the catalytic converters can become clogged over time, triggering check engine lights and reduced fuel efficiency.
Addressing exhaust system issues early can prevent costly repairs.
Mercedes G-Class W463 G 63 AMG Conclusion
The Mercedes G-Class W463 G 63 AMG is a powerful and luxurious SUV, but it is not without its challenges.
Common problems include:
Engine oil consumption, turbocharger wear, and overheating
Transmission and drivetrain issues, including rough shifting and differential failures
Air suspension leaks, steering problems, and suspension component wear
Brake rotor warping, premature pad wear, and brake system faults
Infotainment system malfunctions, battery drain, and electrical issues
Rust on the underbody, doors, and tailgate
Interior seat wear, rattling noises, and climate control failures
Fuel injector clogging and exhaust system failures
Regular maintenance and proactive repairs can help extend the life of the G 63 AMG and keep it running smoothly.
Owners should follow factory service schedules, use high-quality fluids and replacement parts, and address minor issues before they turn into major repairs.
If you own a Mercedes G-Class W463 G 63 AMG and need expert servicing, diagnostics, or repairs, visit us at:
European Auto Pro 253 Goodwood Road, Kings Park, 5034 South Australia
Our team of Mercedes-Benz specialists is equipped to handle G-Class maintenance and repairs, ensuring your G 63 AMG performs at its best for years to come.