2018 Mercedes-Benz GLS 550 problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
6 owner complaints analyzed
3 distinct recall campaigns
7,000 mi median reported failure mileage
Scope: 2018 model year. Data snapshot: . 5 complaints include usable failure mileage.
This selection has limited data. It remains available for lookup but is excluded from search indexing.
Most common problems
Unknown Or Other is the most frequently named component, appearing in 2 of 6 complaints (33.3%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Braking behavior | 2 | 33.3% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Unknown Or Other | 2 |
| Electrical System | 1 |
| Power Train | 1 |
| Seat Belts | 1 |
| Service Brakes, Air:Disc:Rotor | 1 |
| Suspension | 1 |
| Visibility/Wiper | 1 |
Unknown Or Other: 2; Electrical System: 1; Power Train: 1; Seat Belts: 1; Service Brakes, Air:Disc:Rotor: 1; Suspension: 1; Visibility/Wiper: 1
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 3 |
| 25,000 to 49,999 | 1 |
| 50,000 to 74,999 | 0 |
| 75,000 to 99,999 | 1 |
| 100,000 to 149,999 | 0 |
| 150,000 and above | 0 |
Under 25,000: 3; 25,000 to 49,999: 1; 50,000 to 74,999: 0; 75,000 to 99,999: 1; 100,000 to 149,999: 0; 150,000 and above: 0
Under 25,000 miles has the most reports with usable mileage (3). 1 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2018 | 2 |
| 2020 | 1 |
| 2021 | 1 |
| 2024 | 1 |
| 2026 | 1 |
2018: 2; 2020: 1; 2021: 1; 2024: 1; 2026: 1
Pattern summary
Unknown Or Other leads the component reports. Braking behavior appears in 2 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11297292 · 2020-01-06 (January 6, 2020)
SEATBELT HAD TIGHTENED AND NOT RELEASED WHEN MY BODY MOVES. BRAKES ARE NOT APPLIED. TYPICALLY DURING DRIVING I'M SMALL ENOUGH TO MANEUVER MY HAND DOWN TO RELEASE RED SEAT BELT BUTTON. *TR I'VE HAD TO STOP MY VEHICLE 5-10 TIMES TO RELEASE BELT. I HAVE 2 SMALL KIDS 7/ 11 BOTH ARE 60 POUNDS THEY ARE 4 FEET TALL AND 4'6' 7 YEAR OLD STILL USES BOOSTER I''VE CHECKED BELTS TO THE BEST OF MY ABILITY BUT I'M 110 LBS 5'2' AND HAVE NO MECHANICAL TRAINING OR EXPERIENCE OR CERTIFICATIONS THIS HAS BEEN NOTED TO MERCEDES AND THE PROBLEM IS NEVER …
Owner-reported narrative. 32,000 miles reported. Look up ODI 11297292 at NHTSA ↗
Owner report 11429716 · 2021-08-19 (August 19, 2021)
The contact owns a 2018 Mercedes Benz GLS550. The contact stated that when the brake pedal was depressed there was an abnormal noise detected. The brake warning indicator light was illuminated. The contact stated that the brake pad on one side of the disc was completely worn, and the other side of the disc was like new with a full thick pad. The vehicle was taken to the local dealer and the contact was informed that the brake rotor needed to be replaced. The vehicle was repaired. The manufacturer was notified of the failure however, no further…
Owner-reported narrative. 4,500 miles reported. Look up ODI 11429716 at NHTSA ↗