What are the most common Mercedes-Benz GLS problems?
According to Au7o's analysis of 3,550+ owner reports, the 2017-2025 Mercedes-Benz GLS has 4 documented issues. The most frequently reported are: AIRMATIC Air Suspension Failure, 9G-Tronic Harsh Shift, Panoramic Sunroof Water Leak. Of these, 1 is rated critical and should be addressed promptly.
Is the Mercedes-Benz GLS reliable?
The 2017-2025 Mercedes-Benz GLS has 4 known issues documented across 3,550+ owner reports. 1 issue is rated critical: AIRMATIC Air Suspension Failure. 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 GLS problems?
Repair costs for known Mercedes-Benz GLS issues range from $100 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, AIRMATIC Air Suspension Failure, typically costs $800-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What year Mercedes-Benz GLS is the most reliable?
Reliability varies across model years of the Mercedes-Benz GLS. Based on owner reports, issues are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 2017-2025 Mercedes-Benz GLS with 4 documented issues from 3,550+ owner reports.
What is the 2017-2023 Mercedes-Benz GLS AIRMATIC Air Suspension Failure?
The GLS AIRMATIC system is prone to air spring leaks and compressor failure due to the vehicle's heavy curb weight (5,700+ lbs). Front air springs tend to fail first. The compressor overworks to maintain ride height and eventually burns out. Repairs typically run $800-$4,000. Severity: high.
What is the 2017-2023 Mercedes-Benz GLS 9G-Tronic Harsh Shift?
The 9G-Tronic nine-speed automatic exhibits harsh low-speed shifts and hunting between gears on inclines. The transmission software struggles to select the optimal gear among nine ratios, particularly noticeable in stop-and-go traffic. Repairs typically run $150-$2,500. Severity: medium.
What is the 2020-2025 Mercedes-Benz GLS Panoramic Sunroof Water Leak?
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. Repairs typically run $100-$1,500. Severity: medium.
What is the 2020-2025 Mercedes-Benz GLS Battery Drain from 48V System?
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. Repairs typically run $200-$3,500. Severity: medium.
