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Mercedes-Benz · Known Issues

2025 Mercedes-Benz G-Class Problems: 4 Known Issues

2025 model year · 730+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 730+ owner reports, the 2025 Mercedes-Benz G-Class has 4 documented known issues, with 1 rated critical. The most serious is M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring ($300-$18,000 repair). 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.

In This Article

  • G-Class Engine1
  • G-Class Transmission1
  • G-Class Electrical1
  • G-Class Body/Panels1
  • FAQ
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In This Article

  • Engine1
  • Transmission1
  • Electrical1
  • Body/Panels1
  • FAQ

All 4 Known Issues

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On the 2019-2025 Mercedes-Benz G-Class M177 4.0L Twin-Turbo V8, the 4.0L biturbo M177 V8 in the W463A G 550 and 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-running twin-turbo design stresses piston rings and the iron-coated aluminum bores; carbon buildup and ring coking aggravate consumption. If left unaddressed, low oil level can lead to bearing/piston damage. Owners report repeated low-oil warnings between services and, in advanced cases, misfires and blue exhaust smoke.

Common Symptoms

  • Frequent low oil level warnings
  • Oil consumption between services
  • Blue/grey exhaust smoke
  • Misfire at higher mileage
  • Rough idle

How to Fix

Check oil level frequently and top up with the correct MB 229.5/AMG-spec full-synthetic oil; do not rely solely on service intervals. Diagnose with an oil-consumption test and leak-down/compression test; rule out the common contributors first (PCV/oil separator diaphragm, valve seals, turbo seals). Walnut-blast intake valves if carbon-fouled. Confirmed cylinder scoring requires a short block or engine replacement, ideally under powertrain warranty.

Typical repair cost:$300 - $18,000

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
Medium ConfidenceVerifiedReviewed Jun 2026

On the 2019-2025 Mercedes-Benz G-Class M177 4.0L Twin-Turbo V8, mercedes communication 11007728 provides a diagnostic workflow for 725.0/725.1 shift complaints on 2019-2024 G 550 vehicles and specifically calls for reproducibility, transmission-health data, standstill and drive adaptations, torque-converter evaluation, and separation of transfer-case jolting from transmission faults. Communication 11032887 separately identifies harsh low-gear shifts from incorrectly installed rotational-speed sensors on a limited group of 2025-produced VGS units. These records support a harsh/jerky shifting and adaptation identity, but not a universal wet-clutch drift mechanism, a fixed 40,000-50,000-mile service interval, or automatic valve-body and clutch-pack replacement across every 2019-2025 G 550 and AMG G 63.

Common Symptoms

  • exact gear and operating condition documented
  • initial EEPROM and transmission-health data preserved
  • transmission and transfer-case paths isolated

How to Fix

Record the exact shift, gear, temperature, drive mode and load, preserve the initial quick test, EEPROM and transmission-health data, and compare with a like vehicle where appropriate. Use XENTRY IPR and the symptom-specific adaptation or VGS production-date path; isolate the transfer case before attributing a jolt to the transmission. Do not buy a valve body, conductor plate, clutch pack or transmission from this page; the failed path and fitment are not established.

Research This Issue

GoogleRedditYouTubeNHTSA
Community Reported
High ConfidenceVerifiedReviewed Aug 2026
Community reported
450 owners

On the 2013-2025 Mercedes-Benz G-Class, 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, audio, and backup camera all become unavailable during these events.

Common Symptoms

  • Infotainment screen goes black randomly
  • System reboots while driving
  • Navigation freezes mid-route
  • Backup camera not displaying
  • Audio cuts out intermittently

How to Fix

Perform a soft reset by holding the power/volume knob for 10 seconds. Visit the dealer for software updates — Mercedes regularly releases patches. If persistent, the head unit may need replacement under warranty. Ensure the vehicle has the latest map and firmware updates.

Owner tips & cautions

  • TipAlways accept dealer software updates when offered. Most MBUX freeze issues have been resolved through OTA or dealer-applied patches.

Research This Issue

Based on 450 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence450 owner reportsLast reported by owners Feb 2026Reviewed Mar 2026
Community reported
280 owners

On the 2019-2025 Mercedes-Benz G-Class 4.0L V8 Biturbo, 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 commonly affected due to higher use frequency.

Common Symptoms

  • Door does not close flush with body
  • Door requires extra force to latch
  • Visible gap misalignment between door and body
  • Creaking noise when opening or closing door

How to Fix

Replace worn door hinges and check strap assemblies. Dealer replacement is recommended due to the precise alignment required. Lubricate hinges at every service interval with Mercedes-approved grease to extend hinge life.

Owner tips & cautions

  • TipLubricate the door hinges and check straps with white lithium grease every 6 months. This significantly extends their lifespan on these heavy doors.
Typical repair cost:$400 - $1,200

Research This Issue

Based on 280 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence280 owner reportsLast reported by owners Jan 2026Reviewed Mar 2026
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Frequently Asked Questions

What are the most common Mercedes-Benz G-Class problems?

According to Au7o's analysis of 730+ owner reports, the 2025 Mercedes-Benz G-Class has 4 documented issues. The most frequently reported are: M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring, 9G-Tronic / AMG Speedshift Harsh or Jerky Shifting Requiring Adaptation, COMAND/MBUX Infotainment System Freeze and Reboot. Of these, 1 is rated critical and should be addressed promptly.

Is the Mercedes-Benz G-Class reliable?

The 2025 Mercedes-Benz G-Class has 4 known issues documented across 730+ owner reports. 1 issue is rated critical: M177 4.0L Twin-Turbo V8 Excessive Oil Consumption and Cylinder Scoring. 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 G 550 and 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-ou… Repairs typically run $300-$18,000. Severity: high.

What is the 2019-2025 Mercedes-Benz G-Class 9G-Tronic / AMG Speedshift Harsh or Jerky Shifting Requiring Adaptation?

Mercedes communication 11007728 provides a diagnostic workflow for 725.0/725.1 shift complaints on 2019-2024 G 550 vehicles and specifically calls for reproducibility, transmission-health data, standstill and drive adaptations, torque-converter evaluation, and separation of trans… Severity: medium.

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.

Data sourced from 730+ owner reports, NHTSA recalls, TSBs, and automotive forums.

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.