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Vehicle speed controlPart report

2021 Mercedes-Benz S 580 Vehicle speed control Problems

Complaints
3about this part
Share
9%of 34 total for the year
Median mileage
976miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 3 complaints about the vehicle speed control of the 2021 Mercedes-Benz S 580, 9% of the 34 complaints for this model year. Where a mileage was given, the median is 976 miles. 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.

“Background: This is a V-8, gas vehicle.The 12-volt battery gives CRITICAL CHARGE notifications constantly. Incident: Dry pavement, 400-mile, January winter night, highway driving in Wisconsin Northwoods at posted 70 mph; some with cruise control, some without cruise control. Seat belt was in use. On four occasions, car independently, without any warning, dropped from 70 mph to 35 mph, projecting me forward. No reduction in speed signage No small town drive through. With car and semi-truck traffic behind me, luckily no rear end collisions, injury or death occurred. …”

NHTSA complaint #11449057, filed 2022-01

“The contact owns a 2021 Mercedes-Benz S580. The contact stated while driving at 60 MPH, the contact pressed a button on the steering wheel to engage the cruise control function on the vehicle. The contact stated when driving past a mileage sign stating 40 MPH, the vehicle suddenly reduce in speed to 40 MPH, while the contact was on the highway in the fast lane. The contact was able to move the vehicle over to the side of the road waited a few minutes took off the cruise control function and reapplied it back on and continued to drive the vehicle again. …”

NHTSA complaint #11442018, filed 2021-11, 976 miles

Vehicle speed control: other model years

YearComplaintsShare of year
2023117%
202139%

Other parts of the 2021 Mercedes-Benz S 580

Electrical system
10 complaintsOther or unknown
6 complaintsWheels
6 complaintsForward collision avoidance
5 complaintsEngine
4 complaintsEngine cooling
4 complaintsBrakes
3 complaintsLane departure
3 complaintsExterior lighting
2 complaintsFuel system
2 complaintsTires
2 complaintsTransmission and drivetrain
2 complaints

← All problems reported for the 2021 Mercedes-Benz S 580

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 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