2021 Mercedes-Benz G-Class Problems: 7 Known Issues
2021 model year · 1,070+ owner reports · Updated November 2026
According to Au7o's analysis of 1,070+ owner reports, the 2021 Mercedes-Benz G-Class has 7 documented known issues, with 3 rated critical. The most serious are M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring ($300-$18,000 repair), Front Axle Wiring Harness Chafe Against Oil Cooler Causing ABS/ESC Loss (Recall 23V097000) and Fuel Pump Impeller Deformation Causing Loss of Drive Power (Recall 23V445000). The most commonly reported issue is COMAND/MBUX Infotainment System Freeze and Reboot with 450 owner reports. Across all issues with published estimates, repair costs range from $300 to $18,000. DIY maintenance guides at au7o.io.
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Frequently Asked Questions
What are the most common Mercedes-Benz G-Class problems?
According to Au7o's analysis of 1,070+ owner reports, the 2021 Mercedes-Benz G-Class has 7 documented issues. The most frequently reported are: M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring, Front Axle Wiring Harness Chafe Against Oil Cooler Causing ABS/ESC Loss (Recall 23V097000), Fuel Pump Impeller Deformation Causing Loss of Drive Power (Recall 23V445000). Of these, 3 are rated critical and should be addressed promptly.
Is the Mercedes-Benz G-Class reliable?
The 2021 Mercedes-Benz G-Class has 7 known issues documented across 1,070+ owner reports. 3 issues are rated critical: M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring and Front Axle Wiring Harness Chafe Against Oil Cooler Causing ABS/ESC Loss (Recall 23V097000) and Fuel Pump Impeller Deformation Causing Loss of Drive Power (Recall 23V445000). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mercedes-Benz G-Class problems?
Repair costs for known Mercedes-Benz G-Class issues range from $300 to $18,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring, typically costs $300-$18,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2019-2025 Mercedes-Benz G-Class M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring?
The 4.0L biturbo M177 V8 in the W463A AMG G 63 is documented for above-normal engine oil consumption (often 1 quart per ~1,000-2,000 miles in worse cases), with the most severe outcome being cylinder bore/liner scoring and piston ring wear at higher mileage. The high-output, hot-… Repairs typically run $300-$18,000. Severity: high.
What is the 2019-2021 Mercedes-Benz G-Class Front Axle Wiring Harness Chafe Against Oil Cooler Causing ABS/ESC Loss (Recall 23V097000)?
NHTSA recall 23V097 covers 11,018 model-year 2019-2021 G 550 vehicles and 15,098 model-year 2019-2021 AMG G 63 vehicles. The front axle wiring harness can contact and chafe on an auxiliary oil cooler because of a narrow passage, potentially damaging signal wires and impairing ABS… Severity: high.
What is the 2021-2023 Mercedes-Benz G-Class Fuel Pump Impeller Deformation Causing Loss of Drive Power (Recall 23V445000)?
NHTSA recall 23V445 covers model-year 2021-2022 G 550 vehicles and model-year 2021-2023 AMG G 63 vehicles, plus a limited 2022 AMG G 63 4x4 Squared population. Certain fuel-pump impellers may not meet material requirements, deform, contact the pump housing and create enough mecha… Severity: high.
What is the 2013-2023 Mercedes-Benz G-Class Transfer Case Fluid Leak from Output Seal?
The transfer case on newer G-Class models develops fluid leaks at the output shaft seals, particularly where the driveshafts connect. The leak typically starts as a slow seep and worsens over time, eventually leading to low fluid levels and potential transfer case damage if not a… Repairs typically run $500-$1,200. Severity: medium.
What is the 2019-2025 Mercedes-Benz G-Class 9G-Tronic / AMG Speedshift Harsh or Jerky Shifts That May Need Transmission Adaptation?
The G 550 and AMG G 63 use Mercedes' 9-speed 9G-Tronic automatic. On the G 63 it is called AMG SPEEDSHIFT TCT 9G and runs model-specific software tuned for very short shift times. The complaint covered here is harsh or jerky gear changes, a jolt during a shift, or shudder. A Mer… Severity: medium.
What is the 2013-2025 Mercedes-Benz G-Class COMAND/MBUX Infotainment System Freeze and Reboot?
Both the older COMAND NTG5 system and the newer MBUX system in the G-Class experience random freezes, black screens, and spontaneous reboots. The harsh vibration environment of the G-Class body-on-frame chassis may contribute to connection issues at the head unit. Navigation, aud… Severity: low.
What is the 2019-2025 Mercedes-Benz G-Class Door Hinge Sag on Heavy Doors?
The W463A G-Class retains the iconic side-hinged doors which are significantly heavier than conventional doors due to their construction. The door hinges and check straps wear prematurely, causing the doors to sag and become difficult to close properly. The driver door is most co… Repairs typically run $400-$1,200. Severity: low.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.