Which parts fail
Components named in complaints (battery, alternator, wiring, ignition, instrument cluster, infotainment).
Mileage when the problem started
Owner reports
Selected complaints filed with NHTSA by 2015 Mercedes-Benz C300 owners, lightly cleaned up (personal details are redacted by NHTSA).
The contact owns a 2015 Mercedes-Benz C300. The contact stated that while idling at a stop light, the STOP/START system activated; however, after releasing the brake pedal and attempting to accelerate, the instrument panel illuminated simultaneously with several unknown warning lights. The vehicle then powered off completely. The contact manually restarted the vehicle and the vehicle responded as needed. The contact turned off the Automatic STOP/START system. The failure occurred two additional times. The failure had not recurred with the Automatic STOP/START system deactivated. The vehicle was taken to the dealer but had not been diagnosed or repaired. The manufacturer was made aware of the failure. The failure mileage was 158,000.
I was driving my car was sputtering or trying to shut off while I press the gas and I let go of the gas and it catches and stayed on. I took it to the dealership and they said they found nothing wrong. May 3rd around 12pm im driving on the freeway and as im getting on the express lane going 60 it dies and I couldn't move the steering wheel and I slammed into a guardrail. After doing research my car (vin [redacted] ) had multiple recals from the fuel pump and steering wheel and the dealership never fixed or checked any recalls before selling it to me.
Car was parked in Garage with garage door open. Wife and I wanted to go biking and the bikes needed air in the tires. Pre-positioned one bike directly behind parked car and one parallel with the pneumatic air pump prepositioned to inflate the tires. Went to driver's side door and started car with foot on the brake and pushed the button. I then plugged in the adapter for the air pump into the cigarette lighter. The whole time the driver's side door was open and the car was not moving. I exited the car and walked backwards and knelt down abeam the left rear automobile tire to inflate the bike tire. I started the pump at the unit and started to connect the hose to the bike tire, I was then hit from behind by the car door which bent backwards as it passed over me in reverse at low speed. The bike may have saved me by creating a wedge to bend the door back and away from me. …
Power steering malfunction Car unable to drive I believe there is supposed to be a recall for this issue but not popping up when I put in VIN number Warning lamps come up. Sometimes every light on dashboard. Took it to Mercedes but it was when code was not popping up and they said I needed a new battery. Did that but still an issue. Has also happened when driving. Sometimes collision assist plus light comes on and power steering acts up. Light I am pointing at in picture is another light that consistently pops up I have been able to intermittently fix problem by resetting computer by unplugging battery for 15min or longer. As well as confirming full service on vehicle. Now it isn't working though.
Have noticed a lot of air noise coming from the panoramic sunroof of my vehicle when driving, and now have issues of it opening or closing properly. I researched and found a recall regarding the issues my vehicle is having, and brought it into a dealership for diagnosis. Was told my vehicle VIN was not included in the recall. This is a dangerous issue that needs to be remedied. If the sunroof malfunctions I'm afraid it will come loose from the vehicle as it is doing the same things that the recalled VIN vehicles had issue with. Mercedes needs to update and add additional VINs to this recall. I did not repair, as I was told the entire thing will need to be replaced.
When driving I accelerated and then the engine light turned on. after that the car was jolty and turned off completely when stopped. had to force a restart at the light. code that came back was p052E. This is a major and common issue with these cars. part is 400+ dollars. labor is much more since this is a 6 hour job. the work to replace this part is incredibly intensive that makes it impossible for regular car owners to change. Mercedes refuses to recognizes this as a common issue. but the truth is they designed a faulty system that they claim to have updated a handful of times now.
The dealership garage isla verde in carolina, refuse to service my car. They are the only Mercedes-Benz dealer in Puerto Rico and there is no other dealer that can service the recalls of my car. Currently they don't want to fix the recall NTHSA# #21V197 Bonding of Panoramic Sunroof Panel - Wave 2 MY. Their service is poor and negligent. They make an appoinment to then cancel it and deny receiving me or my car on the only authorized dealer to fix the recall and denying any services to my car. They refuses my entrance.
Hi i have seen lot of customers have filed this cause happening in all 2015 to.2018 c300 its crank case vent valve needs to be changed every 30 to 60k miles lt of posts i have seen i just want mercedes to recall this problem.as its $2400 to fix this because something they didnt did right and part goes bad . Pls help.us reach this so they can do recalls why we have to pay 2400
The vehicle's collision prevention assistant plus option often displays during driving. This causes the car to lose acceleration and prevents you from accelerating regardless of how hard you press the gas pedal. This happens for no apparent reason and occurs while in the midst of driving, usually within a busy intersection and has also happened to me several times while driving on the highway. I am very afraid to drive this vehicle. The only way to correct this when it occurs is to pull off the road, shut the car down, and restart the engine after a few minutes. My car was serviced on 1/13/18 and when tested, no evidence of this was found. Since then, this malfunction happened on 1/14 and again today 1/15. This malfunction has the potential to be catastrophic. …
While accelerating from a stop light from 0 to slightly over 40 MPH received error code of anti collision assist inoperable and the vehicle went from 40 MPH to 0 like I hit a tree. It was not a slow smooth motion of slowing to a stop. This was a violent stop throwing me forward and caused my seat belts to activate. It should be noted that there was not a single person in front of me, behind me or beside me. This was nothing short of a miracle because if anyone had been behind me, I would have been rear ended and if anyone had been in the right hand lane I would have hit them as the vehicle pulled to the right very hard when it malfunctioned. I took the car to the dealer and told them I did not want the car back unless they could determine what had happened and could promise that it would never happen again. …
Related recalls
Electrical system › Software
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 AMG GT-S, GLC300, CLA250 and GLE300d 4Matic vehicles, 2013 C250, E350 BlueTec and G63 AMG vehicles, 2008-2014 C300 vehicles, 2013-2014 C300 4Matic and ML350 4Matic vehicles, 2009 C350 vehicles, 2014 CLS550, E350 4Matic, E350 Coupe 4Matic, E350 Wagon 4Matic, GLK350 and…
Remedy: MBUSA will notify owners, and dealers will update software in the affected control units, free of charge. The recall began April 21, 2017. Owners may contact MBUSA customer service at 1-800-367-6372.
Electrical system › Starter assembly
Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2015-2017 C300 4Matic, C300, CLA250, CLA250 4Matic and CLA45 AMG vehicles, 2017 C300 4Matic Cabrio, C300 4Matic Coupe, C300 Cabrio, C300 Coupe, E300, E300 4Matic, E400 4Matic Wagon, E43 AMG 4Matic, GLA250, GLA250 4Matic and GLC300 4Matic Coupe vehicles and 2016 C350e and…
Remedy: MBUSA will notify owners, and dealers will install an additional fuse in the electrical line to the starter, free of charge. The recall began August 31, 2017. Owners may contact MBUSA customer service at 1-800-367-6372.
Electrical complaints in other C300 years
Frequently asked questions
How common are electrical problems on the 2015 Mercedes-Benz C300?
NHTSA has 50 complaints about the electrical system of the 2015 Mercedes-Benz C300, 13% of the model year's 381 complaints. The component named most often is wiring (1 mentions).
Is there a recall for 2015 Mercedes-Benz C300 electrical problems?
Yes — NHTSA recall 17V-177 (software, Mar 14, 2017); NHTSA recall 17V-114 (starter assembly, Feb 23, 2017). Recall repairs are free at authorized dealers.
At what mileage do 2015 Mercedes-Benz C300 electrical problems start?
Half of the complaints with a recorded mileage happened before about 20,000 miles, and 64% before 25,000 miles.
Is it dangerous?
Owners linked 3 crashes, 0 fires and 2 injuries to electrical system problems on this model year. If you notice symptoms, have the car checked before driving further.
Source: U.S. National Highway Traffic Safety Administration (NHTSA) — owner complaints through October 20, 2026, recalls and defect investigations; fuel economy from the EPA. Complaints are unverified reports and are not proof of a defect. How we rate model years.