There are 3 owner-reported electrical system complaints for the 2023 Mercedes-Benz S-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
While driving on highways using cruise control and adaptive cruise control the vehicle decelerates without driver input. The system also misreads or fails to update speed limit signs causing incorrect cruise speeds and sudden speed changes. This behavior has occurred repeatedly during normal driving conditions and creates a risk of rear end collision from following traffic. The problem has been documented across multiple service visits. A repair attempt was made and I was informed that no repair is currently available. The issue recurred immediately after the repair attempt and remains unresolved. No consistent warning lights are displayed before or during the events. The vehicle is available for inspection upon request.
Emergency stop assist
I leased a 2023 Mercedes from Grapevine Mercedes. When I test drove the vehicle the car had a check engine light on. The sales man said he would get that fixed. The salesman had the service tech clear the code without addressing the issue. A week later the check engine light comes on. The dealership has advised me that the car has a software issue and its unsafe to drive. They must wait for technicians in Germany to fix the problem. It will take weeks. There is a chance the car will shut off while driving.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026