2021 Mercedes-Benz Gls450: Reliability Data

Source: NHTSA — 41 complaints
41
Total Complaints
11,000mi
Median Mileage
ELECTRICAL SYSTEM
Top Issue
1
Crash Reports

When Do Complaints Happen?

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

5,000 25th Percentile
11,000 Median Mileage
11,000 75th Percentile

What Fails?

Most reported component issues from NHTSA complaints.

ELECTRICAL SYSTEM
13
UNKNOWN OR OTHER
8
ENGINE
3
SEATS
2
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL:SOFTWARE
1
VEHICLE SPEED CONTROL
1
LANE DEPARTURE: LANE KEEP: STEERING ASSIST
1
ELECTRICAL SYSTEM:12V/24V/48V BATTERY
1
TIRES
1
LANE DEPARTURE: BLIND SPOT DETECTION
1

Severity Assessment

1
Crashes
4
Fires
1
Injuries
0
Deaths

Sample Complaint Reports

"The contact owns a 2021 Mercedes Benz GLS450. The contact stated while driving 75 mph with the cruise control engaged, the vehicle decelerated to 45 mph than to 15 mph. On another occasion, while driving 80 mph, the vehicle independently decelerated to 45 mph. There was no warning light illuminated...."
"The contact owns a 2021 Mercedes Benz GLS450. The contact stated while driving 75 mph with the cruise control engaged, the vehicle decelerated to 45 mph than to 15 mph. On another occasion, while driving 80 mph, the vehicle independently decelerated to 45 mph. There was no warning light illuminated...."
"The car would not start and could not be jumped. I'm told it's the 48V battery has to be replaced. I have seen on the internet numerous people have the same problem and that a large batch of these 48V batteries are the problem. Error message displays stop the vehicle and more details advises battery..."

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