2017 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Engine is the leading concern among 253 owner complaints filed for this model year. This is the 11th highest complaint count among 23 C-Class model years with reports.
Of the 2017 reports, 12 involved a crash and 3 involved a fire. 17 people were injured.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints
253 reports, newest first.
Engine, May 12, 2022
P06DA00 CODE oil pump vale circuit open
Engine, May 12, 2022
CODE PO052E71 crankcase vent solenoid causing check engine light
Power train, Engine, Fuel/propulsion system, Apr 18, 2022
At approximately 26,500 miles of use, the check engine light came on in my Mercedes Benz C300. I brought the vehicle to the dealership and they informed me that the diagnosis was a crankcase vent valve malfunction. The MB fault code is P52E71. After paying Mercedes to fix the issue, I found forums on the internet where many other MB owners reported the same issue at around the same mileage. Being that this seems to be a common malfunction with the C300, I believe that it should be considered as a recall issue. I don't know what could have happened if I didn't service the vehicle, but any engine issue is dangerous while a vehicle is in motion.
Other or unspecified, Apr 15, 2022
I’m trying to ship my car back to the United States and there is a valid recall on my car which I have taken it to the dealership in Korea, which is where I’m currently at, and I cannot get me car updated either because they don’t understand the paper or because I don’t have an official recall which I have also encountered in the states. Without this update my car will not be shipped back home with me. Is there any way I can get this recall information in Korean to possibly make them perform the update.
Seat belts, Mar 31, 2022
The contact owns a 2017 Mercedes-Benz C300. The contact stated that the seat belt latch plate failed to latch securely into the buckle of the seat belt while the contact was attempting to exit the vehicle. The contact referenced NHTSA Campaign Number: 21V032000 (Seat Belts). The vehicle was taken to the dealer to be diagnosed. The contact was informed that the latch needed to be replaced. The seat belt was repaired but failed to operate as needed. The manufacturer was notified of the failure. The failure mileage was 22,000.
Power train, Mar 24, 2022
electronic rear axle lock problem. A recall was issued before but manufacturer has not done anything; therefore when the car is taken in, the dealer asks for a hefty $400 inspection fee
Engine, Fuel/propulsion system, Feb 23, 2022
When starting the car in the morning there is fuel smell that gets into the cabin. Additionally, as the car is idle during the drive, the smell of fuel is very obvious. Windows have to be rolled down to avoid the smell
Structure, Forward collision avoidance, Jan 18, 2022
Collision Assyt not operating, E brake engaged damage rear brakes and rotors
Fuel/propulsion system, Nov 6, 2021
Strong gas smell when car is idling and miles to empty goes down very quickly, approximately a mile or more a minute. There is no recall for this problem and Mercedes is very aware of this problem.
Seat belts, Oct 28, 2021
The contact owns a 2017 Mercedes-Benz C300. The contact stated upon taking the front driver seat belt off she noticed, it was not fully retracting. There were no warning lights illuminated. The contact also stated that the front passenger’s side seat belt was not fully retracting. The contact stated she received notification of NHTSA Campaign Number: 21V032000 (Seat Belts). The vehicle was taken to the dealer for recall repair; however, the dealer informed the contact that the seat belts did not qualify for the recall repair because the seat belts were fully retracting. The manufacturer was notified of the failure and informed the contact that they could not assist because the vehicle recall history did not show that the VIN had been included in the recall. The vehicle was not repaired. The approximate failure mileage was 2,500.
Steering, Other or unspecified, Oct 26, 2021, crash
I was driving on a straight away doing the speed limit which is reported seconds before the car crash. The steering wheel turned to the left really hard out of no where and wouldn’t let me gain control over the car again. I was sober it was 9am and I was aware of my driving. I ended up spinning out and landed in the ditch feet away from the light pole. I made it know to everyone what happened, but they looked at me crazy. I stopped driving that car and sent it back to Mercedes to get a detailed inspection. Which lasted about 30 days for them to get back to me about what happened. When I received the call to get my car they didn’t provide any information about the incident. Instead they just sent it to corporate and left me in the dark. I was in pain during this whole time. I was couldn’t find a lawyer that was willing to help. It’s been three years since the incident and I will have to live with pain for the rest of my life. It’s not fair that we need thousands of dollars to be heard. I have all communication and documentation that was given during the time of incident.
Fuel/propulsion system, Oct 25, 2021
Strong gas odor in the cabin and in motion to the point of causing me to be light headed with my children in the car. Smell of gas coming from the engine when parked. No lights or warnings and it does not occur all of the time just sometimes however ive noticed it 3x the last 5x i have drove my car, the cabin was only extremely bad once.
Seat belts, Oct 21, 2021
The contact owns a 2017 Mercedes-Benz AMG C43. The contact stated that the driver’s and passenger’s side front seat belt retractors had malfunctioned, and the seat belts would not retract after unlocking. The vehicle was taken to the local dealer who performed the recall repair under the NHTSA Campaign Number: 21V032000 (Seat Belts). The contact indicated that after retrieving the vehicle, the failure was still present. The cause of the failure was not yet determined. The manufacturer was notified of the failure. The failure mileage was 50,000.
Suspension, Electrical system, Other or unspecified, Sep 26, 2021
The car was parked on my driveway, As soon as i started it, I got a message 'The electronic rear axle differential lock is inoperative' NHTSA previously issued a recall for 2017 C63s AMG models. I purchased this vehicle from Carvana in April 2021 with clean single owner carfax. The manufacture warranty has expired. I have seen lots of posts on Mercedes forum talking about this issue where Mercedes did fix the issue free of cost. Since there is no open recall on my vehicle, I am not sure what to do.
Fuel/propulsion system, Aug 22, 2021
MB USA extended the warranty coverage on the low pressure fuel hoses that connects to the high pressure fuel pump. The reason is "under certain cold ambient conditions during a cold start of the engine, the low pressure fuel hose at that connection may experience slight fuel weeping". MB USA, however, ruled out a safety risk. NHTSA needs to investigate it. If MB USA found the fuel pressure line is defective, they needed to do a recall. I believe it must be a recall as fuel leaks is not only a safety risk but also a serious health hazard to the occupants. What if the occupants have sinusitis and don't smell well. What if the leaks is too small to smell enough but can still be a health issue.
Electrical system, Forward collision avoidance, Aug 21, 2021
Light came on tonight and stayed on, Collinsion prevention assist inoperable. Car has been involved in any collision for this system to quit out of the blue
Structure, Aug 19, 2021
The contact owns a 2017 Mercedes-Benz C300. The contact received notification of NHTSA Campaign Number: 21V197000 (Structure) however, the part to do the recall repair was unavailable. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was made aware of the issue. The contact stated while driving approximately 60 MPH, the sunroof panel detached from the vehicle. The approximate failure mileage was 39,000. Parts distribution disconnect.
Other or unspecified, Aug 18, 2021
On August 18th, 2021 the roof panel between the windshield and the panoramic roof completely detached while driving on the highway. Luckily no accidents or injuries are reported. Safety recall for this issue has been issued since March 2021 but the factory hasn't produced the parts to send to the dealerships to make the necessary repair to this day. The car is currently unusable and unsafe to drive. Even if the dealership attempts to re-attach another panel they won't have the right adhesive, instructions, and panels that the engineers in the Mercedes factory redesigned to remedy this issue.
Seat belts, Aug 17, 2021
The contact owns a 2017 Mercedes-Benz C43 AMG. The contact received a recall notification for NHTSA Campaign Number: 21V032000 (Seat Belts) however, the dealer informed the contact that the part for the recall repair was not yet available. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The manufacturer was notified of the issue but provided no assistance. The contact had not experienced a failure. Parts distribution disconnect.
Seat belts, Jul 23, 2021
For the past several weeks the seat belt warning light goes on and the chime sounds intermittently while I am driving with the driver seat belt engaged. Also; while this is happening, the seat belt pretensioner repeatedly deactivates and activates. The vehicle is available for inspection at my home in Pleasant View, Utah. Can my safety be compromised if the pretensioner is not activated? Will the driver air bag function if it thinks the seat is empty? The Mercedes Dealer was no help; all the Customer Service person could tell me was there was not a Recall on my vehicle. "Just make an appointment and we will do a Diagnostic Inspection for $179." I have made an appointment with my local Mechanic on Thursday, July 29, and hope that he can fix it.
Seat belts, Jul 20, 2021
The contact owns a 2017 Mercedes-Benz C300. The contact stated that the driver’s and passenger’s side front seat belts failed to retract completely upon release. Due to the failure, the seat belts would fall to the floor upon release from the buckle. The contact then received notification of NHTSA Campaign Number: 21V032000 (Seat Belts). The contact had taken the vehicle to the dealer and had the recall serviced however, upon return of the vehicle, the failure persisted. The contact was willing to supply the part but not the labor costs, he was informed that the retractor assembly needed to be replaced. The contact was informed that the seat belt retractors were not under recall. The contact was provided an estimate for the repair which he declined. Mercedes was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 20,000.
Air bags, Jul 8, 2021, crash
I was in a car accident on June 30,2021. A Car collided into my drivers side at the front left wheel. My airbags did not deploy and i was injured. my injuries consisted of neck, shoulder, and lower back. I was also thrown to the passenger side of the vehicle because my seat belt did not seem to lock. Thank you, [XXX] email- [XXX] INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).
Engine, Jun 8, 2021
Vehicle won’t start or hard to start
Steering, Suspension, Jun 6, 2021
The electronic rear axle differential lock is inoperative; NHTSA previously issued a recall but I was never given a date to fix by the manufacturer.
Electrical system, Communication, Jun 1, 2021
The contact owns a 2017 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 had exceeded a reasonable amount of time for the recall repair. The local dealer claimed that the manufacturer was responsible for the recall repair. The manufacturer was not made aware of the issue. The contact had not experienced a failure. Parts distribution disconnect.