What are the most common Mercedes-Benz GLS problems?

According to Au7o's analysis of 950+ owner reports, the 2024-2024 Mercedes-Benz GLS has 2 documented issues. The most frequently reported are: Panoramic Sunroof Water Leak, Battery Drain from 48V System. None are rated critical, but regular maintenance is recommended.

Is the Mercedes-Benz GLS reliable?

The 2024-2024 Mercedes-Benz GLS has 2 known issues documented across 950+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Mercedes-Benz GLS problems?

Repair costs for known Mercedes-Benz GLS issues range from $100 to $3,500, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

2024 Mercedes-Benz GLS Problems: 2 Issues Every Owner Should Know

2024 Mercedes-Benz GLS Problems: 2 Issues Every Owner Should Know | Au7o

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Community Reported

500 owners

On the 2020-2025 Mercedes-Benz GLS, the large panoramic sunroof on the X167 GLS develops water leaks at the drain tubes or seal interface. Water enters the headliner and can drip into the cabin, staining the headliner and potentially damaging the overhead electronics.

This issue also affects: Ford Bronco Sport, Ford Escape, Jeep Grand Wagoneer

Common Symptoms

Water dripping from overhead console area
Damp headliner after rain or car wash

How to Fix

Clear the sunroof drain tubes with compressed air. Reseal the sunroof glass to the frame if the weatherstrip has shifted. If the headliner is water-stained, it may need cleaning or replacement.

What Owners Are Using

Parts and tips from 500+ owners who fixed this issue

TipAvoid automated car washes with high-pressure nozzles pointed at the roof. The extreme water pressure overwhelms the sunroof seals and drains. Hand wash or touchless wash only.

Typical repair cost:$100 - $1,500

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500+ owners have reported this issue

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Community Reported

Medium Confidence500 reportsLast reported by owners Nov 2025Reviewed Mar 2026

Community Reported

450 owners

On the 2020-2025 Mercedes-Benz GLS, the 48V EQ Boost mild hybrid system causes excessive battery drain when parked. A software bug in the 48V battery management module fails to properly enter sleep mode, draining both the 48V lithium-ion and 12V lead-acid batteries.

This issue also affects: Alfa Romeo Tonale, Audi A6 allroad, Mercedes-Benz C-Class

Common Symptoms

Dead battery after sitting for 3-5 days
Multiple electrical warnings on startup

How to Fix

Update the 48V battery management software at the dealer. If both batteries are deeply discharged, they may need replacement. The 12V battery is $200-400, the 48V battery is $1,500-3,000.

What Owners Are Using

Parts and tips from 450+ owners who fixed this issue

TipIf the GLS sits for more than a week, connect a battery tender to the 12V battery under the hood. The 48V system draws from the 12V to maintain its state of charge.

Typical repair cost:$200 - $3,500

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450+ owners have reported this issue

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Community Reported

Medium Confidence450 reportsLast reported by owners Dec 2025Reviewed Mar 2026

2024 Mercedes-Benz GLS Problems: 2 Issues Every Owner Should Know

All 2 Known Issues

2020-2025 Mercedes-Benz GLS: Panoramic Sunroof Water Leak#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

2020-2025 Mercedes-Benz GLS: Battery Drain from 48V System#

Common Symptoms

How to Fix

What Owners Are Using

Research This Issue

Other Mercedes-Benz Models

Frequently Asked Questions

What are the most common Mercedes-Benz GLS problems?

Is the Mercedes-Benz GLS reliable?

How much does it cost to fix common Mercedes-Benz GLS problems?

What is the 2020-2025 Mercedes-Benz GLS Panoramic Sunroof Water Leak?

What is the 2020-2025 Mercedes-Benz GLS Battery Drain from 48V System?