2026 Mercedes-Benz C 300 4MATIC Problems
Owner-reported complaints filed with NHTSA, grouped by component
Data refreshed
What this page shows
Everything below is an owner-reported complaint submitted to NHTSA about the 2026 Mercedes-Benz C 300 4MATIC, grouped by the component NHTSA recorded on the report. These are not confirmed defects, and they are not recalls. NHTSA does not verify most reports before publishing them, and a category with more reports in it is not evidence that a part is defective.
Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.
Reports by component
Ranked by how many owner reports name each component category
- Driver assistance133.3%
- Electrical133.3%
- Exterior lighting133.3%
Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.
Each component in detail
What the reports in each category say, in the owners' own words
Driver assistance
Reports naming forward-collision avoidance, lane keeping, back-over prevention, cruise control and related electronic driver-assistance systems.
From owner reports, verbatim
I acquired a Mercedes-Benz C300 from Mercedes-Benz of White Plains at [XXX] [XXX] on the last day of XXX Within 2 days of the car sitting in my driveway, I took it out for a drive; the electronic systems failed while I was driving on the highway. The speedometer and odometer went dark, and the turn signals stopped working. Blind Spot Warning, All electronics. I immediately return the vehicle to the dealership. One of the technicians and the manager acknowledged that not only do they see it because it’s still current, but they’ve had similar issues before. They would attempt to repair it with some software updates. In that same conversation, they acknowledged again that this problem had happened before in different capacities. The dealership still has the car 23 days later. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Too few reports in this category for a page of its own — they appear in the full complaint list.
Electrical
Reports naming the electrical system — wiring, battery, charging, control modules, infotainment and electrical accessories.
From owner reports, verbatim
I acquired a Mercedes-Benz C300 from Mercedes-Benz of White Plains at [XXX] [XXX] on the last day of XXX Within 2 days of the car sitting in my driveway, I took it out for a drive; the electronic systems failed while I was driving on the highway. The speedometer and odometer went dark, and the turn signals stopped working. Blind Spot Warning, All electronics. I immediately return the vehicle to the dealership. One of the technicians and the manager acknowledged that not only do they see it because it’s still current, but they’ve had similar issues before. They would attempt to repair it with some software updates. In that same conversation, they acknowledged again that this problem had happened before in different capacities. The dealership still has the car 23 days later. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Too few reports in this category for a page of its own — they appear in the full complaint list.
Exterior lighting
Reports naming headlights, tail lights, turn signals and other exterior lighting.
From owner reports, verbatim
I acquired a Mercedes-Benz C300 from Mercedes-Benz of White Plains at [XXX] [XXX] on the last day of XXX Within 2 days of the car sitting in my driveway, I took it out for a drive; the electronic systems failed while I was driving on the highway. The speedometer and odometer went dark, and the turn signals stopped working. Blind Spot Warning, All electronics. I immediately return the vehicle to the dealership. One of the technicians and the manager acknowledged that not only do they see it because it’s still current, but they’ve had similar issues before. They would attempt to repair it with some software updates. In that same conversation, they acknowledged again that this problem had happened before in different capacities. The dealership still has the car 23 days later. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)
Too few reports in this category for a page of its own — they appear in the full complaint list.
Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers.
Elsewhere on this vehicle
Data sources
- NHTSA Office of Defects Investigation — owner-reported complaints and the components recorded on them
Data on this page last refreshed .