2018 Mercedes-Benz GLS 550 Other or unknown Problems
- Complaints
- 2about this part
- Share
- 33%of 6 total for the year
- Median mileage
- 7,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 2 complaints about the other or unknown of the 2018 Mercedes-Benz GLS 550, 33% of the 6 complaints for this model year. Where a mileage was given, the median is 7,000 miles.
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.
“I was driving in a rural area when all of a sudden I heard what sounded like an explosion. My first instinct was that I had blown a tire because it was so loud. However, the car was handling fine and no warning messages came on. My husband and I both said what was that? Everything on seemed fine mechanically so we kept driving, but a bit shaken by the sudden loud noise. I few hours later we stopped for gas. As my husband went to clean the windshield he noticed the shatter of the glass roof panel. We thought back to the incident earlier and realized that must have been the sound me heard. …”
NHTSA complaint #11154785, filed 2018-11, 7,000 milesRelated service bulletins
- 11035780Aug 4, 2026Complaint Mercedes-Benz USA is currently experiencing limited availability of transmission fluid specification ATF 236.17 due to a global supply constraint. 236.17 ATF 1L and 5L…
- 10205835Sep 16, 2021Model series 167 noise on B/C/D pillars.
- 10205154Aug 5, 2016Gasket may settle causing a slight oil leak.
Other or unknown: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2018 | 2 | 33% |
| 2017 | 3 | 50% |
Other parts of the 2018 Mercedes-Benz GLS 550
1 complaintsElectrical system
1 complaintsSeat belts
1 complaintsSuspension
1 complaintsTransmission and drivetrain
1 complaintsVisibility (wipers, defrost, mirrors)
1 complaints
← All problems reported for the 2018 Mercedes-Benz GLS 550
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