2018 Mercedes-Benz GLS-Class reliability
The 2018 Mercedes-Benz GLS-Class has 22 complaints with NHTSA after 9 years, or 3 per year. That is about even with the other GLS-Class years here. Their median is 3 complaints per year. NHTSA has no recalls on file for this model year.
22
3
0
9
The complaints owners file most often name Service brakes (4 of 22), then Suspension (4) and Electrical system (3). Those filings include 1 that reports a crash and 3 that report a fire.
The 2017 GLS-Class has 42 complaints, 6 per year, and the 2019 has 28 complaints, 2 per year. The 2018 has fewer complaints per year than the 2017. The 2018 has more complaints per year than the 2019.
The complaint rate is complaints filed in this year’s first 3 years on the road, divided by however many of those years have passed. Recalls are a separate count. The numbers are for the US-market 2018 Mercedes-Benz GLS-Class. How we count. Data as of .
Recalls (0)
No recalls on file with NHTSA for this model year.
Complaints by component (22 total)
Show 7 more Show less
1
3
0
0
Complaints filed per year
Excerpts from recent NHTSA complaint filings
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"The contact owns a 2018 Mercedes-Benz GLS 550. The contact stated while driving at various speeds, the vehicle made an abnormal clicking sound when making a right turn, and an abnormal ticking sound at startup. There…"
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"January 2023 - Airbag suspension failed. Replaced by Mercedes dealership. December 2024 - Airbag suspension failed. Replaced by Mercedes dealership. April 2024: First brake failure. The brakes stopped while driving.…"
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"Brake brakes are terrible. They have other years that they’ve acknowledge that the break are spongy and at times does not break the GLS has that defect. Also smell of gas fumes inside the vehicle. Please direct me the…"
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"When attempting to rise/lower the automatic suspension, the compressor cooling notification pops up, followed by a malfunction. After this occurs, the vehicle is incredibly bumpy, to the point of it being unsafe to…"
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"This 2018 gls 450 has issues with suspension system. Bought this car in 2023 and using since Jna 2023 and suspension system failed like 3 -4 times. Mechanic changed the air compressor , valves and others and still the…"
NHTSA crash ratings
| Version | Overall | Front | Side | Rollover |
|---|---|---|---|---|
| 2018 Mercedes-Benz GLS-Class SUV 4WD | Not rated | Not rated | Not rated | Not rated |
Stars are how this vehicle did in NHTSA crash tests. They are a safety result, separate from the complaint record. Not rated means that test was not run for this version.
Specs and fitment
Known issues for this generation
Recall 17V-241 covers certain 2016-2017 GLE and GLS vehicles (and related models) where the electric power-steering connector may be insufficiently sealed against water; moisture can deactivate power assist. The campaign lists 58,323 vehicles across those platforms; dealers replace the connector and inspect the steering rack. Recall 18V-272 also includes certain 2017 GLS350d, GLS450, GLS550, and GLS63 AMG 4Matic vehicles for power-steering reservoir oil-foam leakage among a larger ML/GL population (9,725 vehicles).
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Frequently asked questions
Is the 2018 Mercedes-Benz GLS-Class reliable?
The 2018 Mercedes-Benz GLS-Class has 22 complaints with NHTSA after 9 years, or 3 per year. That is about even with the other GLS-Class years here. Their median is 3 complaints per year. NHTSA has no recalls on file for this model year.
What are common problems with a 2018 Mercedes-Benz GLS-Class?
The complaints owners file most often name Service brakes (4 of 22), then Suspension (4) and Electrical system (3). Those filings include 1 that reports a crash and 3 that report a fire.
Is the 2018 Mercedes-Benz GLS-Class more reliable than the years next to it?
The 2017 GLS-Class has 42 complaints, 6 per year, and the 2019 has 28 complaints, 2 per year. The 2018 has fewer complaints per year than the 2017. The 2018 has more complaints per year than the 2019.
Has the 2018 Mercedes-Benz GLS-Class been recalled?
NHTSA has no recalls on file for the 2018 Mercedes-Benz GLS-Class.
How many complaints have owners filed about the 2018 Mercedes-Benz GLS-Class?
Owners have filed 22 complaints about the 2018 Mercedes-Benz GLS-Class with NHTSA.
What oil does a Mercedes-Benz GLS-Class take?
X166 GLS 450 lists 0W-30/0W-40/5W-30/5W-40 (~7.4 qt); X167 GLS 450 lists 0W-40 or 5W-40 (~9 qt). Verify the MB sheet on the container.
What does recall 24V-118 cover on the GLS?
Certain 2020-2023 GLE 450 and GLS 450 vehicles: the transmission may not fully downshift in certain situations—see the NHTSA campaign for the remedy.
Which GLS generations does this site track?
X166 (2016-2019) and X167 (2020-on).