2019 Mercedes-Benz C 300 problems and owner complaints

TL* THE CONTACT OWNS A 2019 MERCEDES-BENZ C300W4. WHILE DRIVING VARIOUS SPEEDS, THE ACTIVE BRAKE ASSIST ENGAGED WITHOUT WARNING. THE FAILURE WAS EXPERIENCED SEVERAL TIMES WHILE DRIVING. THE VEHICLE WAS TAKEN TO MERCEDES-BENZ OF RENO (11500 S VIRGINIA ST, RENO, NV 89511, [phone removed]) TO BE DIAGNOSED, BUT A FAILURE CODE COULD NOT BE LOCATED. THE VEHICLE WAS ALSO TEST DRIVEN AND THE FAILURE WAS NOT DUPLICATED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND DID NOT ASSIST. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 750. *BF CO…

Owner-reported narrative. 750 miles reported. Look up ODI 11242687 at NHTSA ↗

2019 MERCEDES BENZ C300. CONSUMER WRITES IN REGARDS TO DEFECTIVE AUTOMATIC BRAKE SENSOR. *LD THE CONSUMER STATED THE AUTOMATIC BRAKE SENSOR WAS BEING TRIGGERED WITHOUT REASON. THE CONSUMER REQUESTED TO BE REIMBURSED FOR THE VEHICLE. *JS

Owner-reported narrative. Look up ODI 11297630 at NHTSA ↗

TL* THE CONTACT OWNS A 2019 MERCEDES-BENZ C300. THE CONTACT STATED THAT WHENEVER THE STEERING WHEEL WAS TURNED LEFT OR RIGHT, THERE WAS A GRINDING SOUND COMING FROM THE STEERING WHEEL. THE CONTACT CONTACTED MERCEDES BENZ OF BROOKLYN (1800 SHORE PKWY BROOKLYN NY 11214; [phone removed]) WHO STATED THEY WERE AWARE OF SIMILAR ISSUES HOWEVER, THERE WAS NO RECALL. THE VEHICLE HAD NOT BEEN DIAGNOSED NOR REPAIRED. THE MANUFACTURER WAS MADE AWARE OF THE FAILURE AND INFORMED THE CONTACT THAT THE FAILURE WAS TYPICALLY CAUSED BY AN IMPACT. THE MANUFACTURER…

Owner-reported narrative. 17,506 miles reported. Look up ODI 11360247 at NHTSA ↗

The steering wheel tilt no longer works

Owner-reported narrative. Look up ODI 11447433 at NHTSA ↗

TL* THE CONTACT OWNS A 2019 MERCEDES-BENZ C300W4. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 19V586000 (ELECTRICAL SYSTEM). THE CONTACT STATED THAT MERCEDES-BENZ OF CALDWELL (LOCATED AT 1230 BLOOMFIELD AVE, WEST CALDWELL, NJ 07006, [phone removed]) EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR. THE MANUFACTURER WAS NOT NOTIFIED. THE PART WAS NOT AVAILABLE FOR THE REPAIR. THE CONTACT HAD NOT EXPERIENCED A FAILURE. PARTS DISTRIBUTION DISCONNECT.

Owner-reported narrative. Look up ODI 11267955 at NHTSA ↗

TL* THE CONTACT OWNS A 2019 MERCEDES-BENZ C300. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 21V058000 (COMMUNICATION, ELECTRICAL SYSTEM) HOWEVER, THE PART TO DO THE RECALL REPAIR WAS NOT YET AVAILABLE. THE CONTACT STATED THAT THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR. THE CONTACT EXPERIENCED THE FAILURE WHILE APPROACHING A STOP SIGN WHEN THE VEHICLE FAILED TO ACCELERATE FORWARD WITHOUT WARNING. THE CONTACT COASTED THE VEHICLE 5 MPH TO THE SHOULDER OF THE ROAD. THE CONTACT TURNED OFF AND RESTARTE…

Owner-reported narrative. 8,004 miles reported. Look up ODI 11403839 at NHTSA ↗

TL* THE CONTACT LEASED A 2019 MERCEDES-BENZ C300. THE CONTACT STATED THAT WHILE DRIVING AT 70 MPH, THE VEHICLE DECELERATED INDEPENDENTLY TO 30 MPH WITH THE CHECK ENGINE WARNING LIGHT ILLUMINATED. THE FAILURE WAS EXPERIENCED THREE TIMES. THE VEHICLE WAS TOWED TO THREE UNKNOWN DEALERS WHERE THE VEHICLE WAS DIAGNOSED AND THE CONTACT WAS INFORMED THAT THE HIGH-PRESSURE FUEL PUMP NEEDED TO BE REPLACED. THE ECM WAS ALSO REPLACED HOWEVER, THE REPAIR FAILED TO FIX THE FAILURE. THE VEHICLE WAS NOT REPAIRED. THE FAILURE MILEAGE WAS 6,000.

Owner-reported narrative. 6,000 miles reported. Look up ODI 11326229 at NHTSA ↗

The contact owns a 2019 Mercedes-Benz C300. The contact stated that the vehicle would shut off soon after being cold started with several unknown warning lights illuminated. The vehicle was towed to the dealer where a diagnostic test was performed. The diagnostic test showed that the fuel pump was defective and needed to be replaced. The contact drove the vehicle for a few days after the diagnostic test but experienced the failure a second time. The vehicle was then towed to an independent mechanic for a second opinion where the contact was giv…

Owner-reported narrative. 25,751 miles reported. Look up ODI 11559107 at NHTSA ↗

This vehicle was brought to an authorized Mercedes-Benz dealership for regularly scheduled maintenance. Shortly after this service, the vehicle began experiencing significant issues including difficulty accelerating, engine hesitation while driving, and noticeable shaking at idle. This car has never overheated. The vehicle was returned to the dealership for inspection. The dealership diagnosed a cracked cylinder head and advised that the repair requires replacement of the cylinder head at an estimated cost of approximately $11,000. The failed…

Owner-reported narrative. Look up ODI 11706568 at NHTSA ↗

Throttle body and accelerator pedal position sensors failed. Component is available for inspection upon request. Independent service center confirmed failure on 1/3/2026 with 6 stored fault codes: P2101, P0122, P0222, P0123, P0223, P2135. Vehicle shuts off while driving without warning at various speeds. Loss of power steering and power brakes occurs when engine stalls, creating immediate risk of crash, injury or death to occupants and other drivers. Manufacturer customer service confirmed in writing 4 times that engine shutting off while dri…

Owner-reported narrative. Look up ODI 11747712 at NHTSA ↗

Shifting gears when stopped and the car lunged forward while I was stopped at a red light. I almost hit the car in front of me at the red light. Very rough gear changes and changing out of the correct gear to the wrong one and then back into another one. Severe speed changes - jerking the car back or it lunges forward, while driving results in loss of reasonable control of the vehicle and inability to to shift correctly out of traffic. Mercedes benz has a technical service bulletin on this problem and is aware that the 9G-Tronic - internally d…

Owner-reported narrative. Look up ODI 11757307 at NHTSA ↗