"How reliable is the 2020 Mercedes-Benz Gls 450?"

"Based on 55 NHTSA complaints, the 2020 Mercedes-Benz Gls 450 has a median complaint mileage of 4200 miles. The most common issue is ELECTRICAL SYSTEM."

"What are common problems with the 2020 Mercedes-Benz Gls 450?"

"The most frequently reported component in NHTSA complaints for the 2020 Mercedes-Benz Gls 450 is ELECTRICAL SYSTEM, accounting for a significant portion of the 55 total complaints filed."

2020 Mercedes-Benz Gls 450: Reliability Data

Source: NHTSA — 55 complaints

Total Complaints

4,200mi

Median Mileage

ELECTRICAL SYSTEM

Top Issue

Crash Reports

When Do Complaints Happen?

Distribution of NHTSA complaints by vehicle mileage at time of report.

4,200 25th Percentile

4,200 Median Mileage

4,200 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ELECTRICAL SYSTEM

ENGINE

FUEL/PROPULSION SYSTEM

POWER TRAIN

UNKNOWN OR OTHER

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

FORWARD COLLISION AVOIDANCE: WARNINGS

SERVICE BRAKES

AIR BAGS

Severity Assessment

Crashes

Fires

Injuries

Deaths

Sample Complaint Reports

"WHILE DRIVING THE VEHICLE, A SERIES OF ELECTRICAL SYSTEM WARNINGS WERE DISPLAYED IN RAPID SUCCESSION. SHORTLY THEREAFTER, THE VEHICLE LOST POWER, THE ENGINE SHUT OFF, AND THE VEHICLE BEGAN TO GLIDE. THIS INCIDENT OCCURRED ON A RESIDENTIAL STREET WHILE THE VEHICLE WAS TRAVELLING AT 25-30 MPH. THE WAR..."

"CLIP MISSING FROM RIGHT HAND SIDE PASSENGER SEAT (2ND ROW), CAUSING THE SEAT TO FOLD ALL THE WAY FORWARD MULTIPLE TIMES ON ITS OWN. THIS HAPPENED WHEN THE CAR WAS STATIONARY. THE DEALERSHIP FIXED THE ISSUE AND ADDED THE MISSING CLIP."

"WE PURCHASED A NEW 2020 MERCEDES BENZ GLS 450 IN OCTOBER 2019 FROM THE OAKLAND DEALERSHIP AND SHIPPED THE CAR TO HAWAII. THE VEHICLE IS NOW 117 MONTHS OLD AND HAS ABOUT 4100 MILES. BECAUSE OUR VEHICLE IS LIGHTLY USED WE ARRANGED FOR MERCEDES BENZ TO SUPPLY AND INSTALLED A 'BATTERY MINDER' TO KEEP TH..."

Source: NHTSA ODI Complaints Database. Names and identifying details omitted.

Data source: View this vehicle on NHTSA.gov | NHTSA ODI Complaints Database. Public domain.

Methodology: Complaint counts and mileage distributions are computed directly from consumer-reported NHTSA complaints. This data represents reported issues, not failure rates — vehicles without complaints are not represented. Full methodology.

Data through: 2026-03-28