2025 Mercedes-Benz C-Class Problems: 4 Known Issues

On the 2022-2025 Mercedes-Benz C-Class 2.0L I4 turbo M254 (48V ISG), the W206 C-Class uses a 48V mild-hybrid system with an integrated starter-generator (ISG), and owners have reported no-start conditions, repeated warning messages, charging-system faults, and sudden reduced-power events tied to the 48V system. Mercedes has issued service information and field actions on related hybrid electrical faults across current models using this architecture, and owner complaints describe vehicles becoming undriveable or requiring towing. Failures can involve the ISG itself, DC/DC conversion, wiring, or software/calibration issues that trigger shutdowns and battery warnings.

On the 2022-2025 Mercedes-Benz C-Class, owners of the W206 C-Class have reported intermittent or persistent failures of the central MBUX display and digital instrument cluster, including black screens, repeated rebooting, frozen infotainment, and loss of the rear-view camera image. This is well documented through NHTSA complaints and Mercedes service communications tied to software faults and control-unit communication problems on the new electrical architecture. When the display or camera feed drops out, key vehicle information and driver-assistance functions may also be unavailable until the system is restarted or reprogrammed.

On the 2022-2025 Mercedes-Benz C-Class, on some 2022-2025 C-Class (W206) cars, several driver-assistance warnings appear at the same time, such as "Active Brake Assist function restricted", "Active Emergency Stop Assist inoperative", "Active Lane Keeping Assist inoperative" or "Active Blind Spot Assist inoperative", and those features stop working until the fault is fixed. Mercedes-Benz documented one cause in Xentry Tip LI54.71-P-075704 (January 2023) for model series 206, 223 and 297. After the driver assistance control unit (N62/4) is reprogrammed with new software, the automatic SCN coding step can, in rare cases, fail to run, and the instrument cluster then shows these messages. The bulletin notes that a dealer quick test may not show any fault codes related to the messages. The same control unit also received a software service campaign in May 2023 (No. 2023040017) on 2022-2023 C-Class cars. That campaign fixed unwanted brake applications near large structures that run parallel to the road about 26-33 feet up, such as overhanging bridge abutments. Because that campaign is an N62/4 software update, it is one of the updates after which the missing-coding fault described in the Xentry Tip can occur. Dirty or blocked sensors and camera or radar misalignment after body or windshield work can also take these features offline, but no Mercedes bulletin found here ties those causes to the W206.

On the 2022-2025 Mercedes-Benz C-Class, on the current-generation C-Class (series 206), Mercedes-Benz has acknowledged a rhythmic thumping noise from the front end during braking. Its technical bulletin LI42.10-P-074952 (June 9, 2022) applies to series 206 cars with option code U29, the Sport Brake System, and files the symptom under brakes that "vibrate/shudder." Mercedes listed the cause as "under investigation" and stated that braking ability is not affected. Owner reports match this. One 2022 C300 owner, with under 100 miles on the car, said it made a clunking noise and they could feel a thumping through the brake pedal at every stop. The bulletin does not name a faulty part. It is not a recall and does not announce any updated part.