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Other or unknownPart report

2020 Mercedes-Benz GLS 450 Other or unknown Problems

Complaints
4about this part
Share
11%of 36 total for the year
Median mileage
—not reported
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 4 complaints about the other or unknown of the 2020 Mercedes-Benz GLS 450, 11% of the 36 complaints for this model year. 1 of these say a crash was involved, according to the filers.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“03/17/2023 driving on US1 coming up to speed after pulling onto highway after cars passed I went 0.2 miles and was looking at my driver side mirror ( no traffic on road ahead of me) when I hit something that pushed my big SUV toward oncoming traffic. I held wheel and muscled car to side of road stopping short of a telephone pole. Car was upright I had trouble loosening seat belt while my wife was hanging forward into hers. Dog harnessed in back seat was ok Got out of car to see a car hauler 30? Footer sticking about 4 feet into the road and travel lane. …”

NHTSA complaint #11524751, filed 2023-05

“The sunroof spontaneously shattered while driving down the interstate. No other cars involved and no rocks or debris caused it. It was inspected and repaired at a Mercedes dealer, however, Mercedes refused to cover the repair under the pre-owned certified warranty. We had to file an insurance claim. In doing research, it appears this is a common and ongoing problem with various models of Mercedes.”

NHTSA complaint #11658502, filed 2025-05

“Window trim on the passenger rear window fell off while driving- it put others at risk by flying off the vehicle on the interstate- Mercedes Benz of Omaha quoted replacement of the window trim parts- no warning messages on dash”

NHTSA complaint #11738164, filed 2026-05

“Upon starting the car, the screen of the 2020 Mercedes Benz GLS 450 remained blank. This includes the portion of the dashboard that reads speedometer, gas, temperature, RPM. The engine was running and truck could still be driven. The vehicle is available for inspection upon request. This is a major safety issue as the driver does not have visibility to the dashboard with all it's important information. The vehicle is currently at Mercedes Benz dealership undergoing diagnostics. The vehicle is being inspected by Mercedes Benz (manufacturer). See prior comment. …”

NHTSA complaint #11435522, filed 2021-10

Related service bulletins

Other or unknown: other model years

YearComplaintsShare of year
2021826%
2020411%
2019728%
201817%
2017720%

Other parts of the 2020 Mercedes-Benz GLS 450

Electrical system
18 complaintsEngine
9 complaintsForward collision avoidance
7 complaintsFuel system
7 complaintsTransmission and drivetrain
4 complaintsAir bags
2 complaintsBack-over prevention (rear camera)
2 complaintsBrakes
2 complaintsBody and structure
2 complaintsVisibility (wipers, defrost, mirrors)
2 complaintsSeats
1 complaintsSteering
1 complaints

← All problems reported for the 2020 Mercedes-Benz GLS 450

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Nov 1, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology