There are 3 owner-reported speed control & cruise complaints for the 2015 Mercedes-Benz C-Classin NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
CAR LOOSES SPEED WHILE DRIVING IN THE STREET OR A HIGHWAY. NO CODE HAVE BEEN DETECTED IN THE COMPUTER. I HAVE BEEN TAKING THE CAR TO THE DEALERSHIP BUT THEY HAVEN'T FOUND WHAT'S THE PROBLEM.
TL* THE CONTACT OWNS A 2015 MERCEDES-BENZ C350. WHILE DRIVING 65 MPH, THE ACCELERATOR PEDAL WAS DEPRESSED, BUT THE VEHICLE FAILED TO ACCELERATE. MULTIPLE WARNING INDICATORS ILLUMINATED. AFTER THE VEHICLE WAS TURNED OFF AND RESTARTED, IT OPERATED CORRECTLY. THE VEHICLE WAS TAKEN TO FRED MARTIN OF YOUNGSTOWN (4701 MAHONING AVE, AUSTINTOWN, OH 44515, (330) 793-2444) WHERE THE CONTACT WAS UNAWARE OF THE DIAGNOSIS; HOWEVER, HE WAS INFORMED THAT SOME OF THE WIRING WAS CLEANED. THE CONTACT MENTIONED THAT THE FAILURE RECURRED A YEAR LATER AND AN APPOINTMENT WAS SCHEDULED WITH THE DEALER FOR DIAGNOSTIC TESTING. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND INFORMED THE DEALER TO CONTACT THEM WITH THE DIAGNOSTIC RESULTS. THE APPROXIMATE FAILURE MILEAGE WAS 17,000. THE VIN WAS NOT AVAILABLE.
TL* THE CONTACT OWNS A 2015 MERCEDES BENZ C300. WHILE DRIVING AT 55 MPH, WHEN THE ACCELERATOR PEDAL WAS DEPRESSED BUT THE VEHICLE DID NOT ACCELERATE. THE CONTACT COASTED OVER TO AN EMERGENCY LANE. THE VEHICLE WAS TAKEN TO THE DEALER BUT THE FAILURE WAS UNABLE TO BE DETERMINED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 1,200.
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 25, 2026