19 complaints reported

2012 Mercedes-Benz C-Class UNKNOWN OR OTHER

Owner-reported problems and safety issues filed with NHTSA. Review common failures, severity levels, and complaint trends over time.

Reports
19
Crashes
0
Fires
0
Injuries
0

Complaint Timeline

Chronological view of owner reports

Jul 2025

The electronic steering lock failed resulting in my car being completely disabled. My safety was not at risk in this particular instance. I was left stranded in a parking lot at night. The component was not inspected by the manufacturer or dealer. The manufacturer/dealer did not inform anyone that this problem will happen to every car with this compensation. This component failed without warning/symptoms/messages. It will fail on all Mercedes Benz cars from 2008-2016. The problem has not been confirmed or communicated by the dealer. Other Mercedes benz owners have encountered this problem resulting in their cars being disabled and leaving them stranded.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C63 AMG, Manufacturer: Mercedes-Benz USA, LLC
Incident: May 2025
Feb 2024

Took my 2012 Mercedes c300 to my mechanic and the Rear Sub frame is rusting out.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Feb 2024
Dec 2023

The drivers door handle broke. In researching online, this has been an issue with Mercedes Benz since they are made of weak plastic. Apparently, they have a more stronger version now. It’s a safety concern as you cannot open the door from the inside.You have to roll down the window, and open the door using the outside handle. What if the power window didn’t work?This is a severe safety concern. If you have to exit the vehicle in a hurry, due to a fire, or accidentally started submerging in water. This should be a recall, we should not have to pay for a replacement to the newer door handle

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2023
Sep 2023

My vehicle has 70,000 miles. always kept garaged. Told by dealer when taken for the yearly checkup that the rear subframe of the car is totally rotted. Needs replacement. Price $3790. Mercedes would only cover 20% of the cost. There have been recalls in Canada with the same issues. Please investigate as this is a serious defect problem and not a warranty issue as Mercedes is claiming.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Sep 2023
Aug 2023

Premature subframe rust, causing the vehicle to swerve when brakes are applied looks to be a trend: https://www.benzworld.org/threads/2012-c300-rear-subframe-any-updates-on-recall.3086018/page-6

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2022
Jul 2023

I was driving on the highway and came to a sudden stop and the car fishtailed putting our safety and the safety of others at risk. I brought my car to a mechanic and I changed my tires. When I went for a wheel alignment the mechanic found that the K bar subframe was corroded and cracked. There was no warning prior to the failure. I had no idea there was a problem because the K bar is behind the snow flap and was hidden.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Dec 2023
Jun 2023

Dear Sir/Madam, I am writing to file a formal complaint against the Fletcher Jones Mercedes-Benz franchise located in Ontario, California and Mercedes-Benz USA , specifically addressing the issue of the dealership closing the recalls and not honoring the warranty recall on my 2012 Mercedes C250, even though I have received multiple automotive part recall notices for my vehicle. Please see the attached files below for the full story. Thank you for your time.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C250, Manufacturer: Mercedes-Benz USA, LLC
Incident: Dec 2021
Jun 2023

Dear Sir/Madam, I am writing to file a formal complaint against the Fletcher Jones Mercedes-Benz franchise located in Ontario, California and Mercedes-Benz USA , specifically addressing the issue of the dealership closing the recalls and not honoring the warranty recall on my 2012 Mercedes C250, even though I have received multiple automotive part recall notices for my vehicle. Please see the attached files for more details.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C250, Manufacturer: Mercedes-Benz USA, LLC
Incident: Dec 2021
Jun 2023

I started hearing noises about a week ago while driving. Last night while driving home in the evening traffic, I braked and car violently jerked and veered to the right almost hitting the car in the front. I took the car to a shop this morning and they found that the rear subframe had collapsed due to rust and advised the car was extremely dangerous to drive.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: May 2023
Nov 2022

I purchased a 2012 Mercedes C300 AWD from a local dealer and have had it serviced annually. Last week I took it in for the annual servicing and was told by the dealer that the rear subframe had corrosion /rust and the car was not safe to drive. I asked if it was covered under a recall and they said not by Mercedes at this time.They provided a repair estimate that is quite high and close to the appraised value of the car. I asked if there were any options available through Mercedes or the dealer and they confirmed not at this time. I have read many articles related to this problem and imagine there are many complaints on file at NHTSA. This is obviously a serious safety issue and currently Mercedes is not taking responsibility and directing the costs to their customers. In addition there is a subframe parts shortage and it could take weeks to fix. I'm requesting that this be listed as a recall item by Mercedes.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Nov 2022
Nov 2022

The rear subframe on my 2012 Mercedes Benz C300 was corroded and broke. This caused the car to lose control and easily could have been been life threatening at high speeds. Mercedes Benz is clearly aware of this issue and knows this is a part defect but has not been willing to do a recall in the US even though they have done so in other countries. The dealership has told me this needs to be repaired as the car can’t be driven, so I am not happy I need to pay $5,000 out of pocket for a part defect Mercedes knows about and refuses to issue a recall even though this problem can cause a fatal accident. There were no warning signs besides hearing thumping sounds and the instability caused by the part defect when it finally failed and broke.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Sep 2022
Sep 2022

the rear subframe rotted away

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2021
Sep 2022

The W204 subframe of my Mercedes Benz C Class is failing and in need of repair, this should not be happening to a car with less than 80K miles on it. My local auto repair shop which exclusively services Mercedes Benz currently has two vehicles with the same issue and informed me that the subframe part is currently out of stock due to the number of failures. This issue has caused a recall in other countries. What is the NHTSA doing about this issue. I will be contacting my congressional representative today as well.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2022
Sep 2022

The sub frame broke in half and the dealership said it is due to rust. The car has been garage kept and not driven much at all. It’s a 10 year old car with only about 55,000 miles on it. It’s been used very gently.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2022
Jun 2022

Rear Subframe Rot- this seems to be a common and known issue with Mercedes’ that should be a recall. Yet Mercedes is charging almost $6000 to get this fixed at the dealer. Plus the parts are on back order for months. This is causing cars to sway when stopping. This is definitely a hazard and should be addressed ASAP!

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jun 2022
Oct 2020

MY VEHICLE STARTED TO PULL LEFT WHEN BRAKING. HAD ALL BRAKES REPLACED AND PULLING CONITNUED. AFTER FURTHER REVIEW, FOUND OUT THAT THE REAR CROSSMEMBER / SUB-FRAME WAS ROTTED ON THE DRIVER SIDE. WHEN BRAKING, THE REAR DRIVER SIDE WHEEL SHIFTS. YOU CAN SEE THE REAR CALIPER MOVE UP. THE PROBLEM IS THAT THE SUBFRAME IS SO ROTTED THAT IT SHIFTS THE ARMS COMING OFF OF IT (EITHER TRAILING OR TORQUE ARM), CAUSING A DANGEROUS SHIFT IN THE BRAKE/WHEEL. CALLED MERCEDES CUSTOMER SUPPORT AND ALL THEY OFFERED WAS A SMALL DISCOUNT ON THE FULL REPAIR COST, WHICH OF COURSE IS ALREADY OVERPRICED. MY VEHICLE IS 8 YEARS OLD, GARAGE KEPT, ORIGINAL OWNERS, AND ONLY HAS ABOUT 45,000 MILES ON IT. NOTHING ELSE ON THE CAR IS ROTTED. THIS IS OBVIOUSLY A QUALITY CONTROL ISSUE BY THE MANUFACTURER. UPON FURTHER REVIEW, THIS IS A COMMON PROBLEM FOR 2008-2015 MERCEDES VEHICLES.

Type: Vehicle, Vehicle: 2012 MERCEDES-BENZ C204.9, Manufacturer: Mercedes-Benz USA, LLC
Incident: Apr 2020
Dec 2018

MY DRIVERS SIDE DOOR HANDLE ON THE INSIDE DOES NOT WORK. I NEVER HAD ANY PROBLEMS PRIOR TO THIS. I DROVE TO MY APPOINTMENT, GOT OUT OF MY CAR NORMALLY. UPON RETURNING TO MY CAR I NOTICED MY DOOR HANDLE LOOKED LOOSE, THEN COULD NO LONGER OPEN MY DOOR FROM THE INSIDE. I HAVE TO ROLL DOWN MY WINDOW IN ORDER TO OPEN MY DOOR ON THE OUTSIDE, WHICH IS EXTREMELY IRRITATING. THE COST TO REPAIR IS OVER $1,000 WHICH I DO NOT BELIEVE IS MY RESPONSIBILITY TO PAY FAR. I AM SCARED TO HAVE MY KIDS IN MY, IN CASE AN ACCIDENT DOES OCCUR AND I CANNOT EXIT THE VEHICLE. AFTER SEARCHING THIS PROBLEM I HAVE LEARNED THAT IT IS EXTREMELY COMMON IN THESE MODELS. THIS IS OBVIOUSLY ON MERCEDES TO RECALL FOR YOUR VALUED CUSTOMERS SAFETY.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C250, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2018
Aug 2018

INTERIOR DOOR LATCH SPONTANEOUSLY BROKE. I HAD DRIVEN MY CAR TO WORK THAT MORNING AND GOTTEN OUT OF THE CAR TO GO INTO MY OFFICE BUILDING. THERE WAS NO SIGN OF ANY ISSUE WITH THE LATCH. LATER THAT AFTERNOON, I LEFT WORK AND MADE A STOP SOMEWHERE. WHEN I WENT TO GET OUT OF THE CARE THE LATCH JUST FLOPPED. THERE WAS NO SPRING ACTION AND I COULD NOT GET OUT OF THE CAR UNTIL I ROLLED DOWN THE WINDOW AND OPENED THE DOOR FROM THE OUTSIDE. ACCORDING TO FORUMS ON MBWORLD.COM DATING AS FAR BACK AS 2012, THIS IS A COMMON ISSUE FOR C-CLASS AND OTHER MB MODELS THIS COULD DEFINITELY BE A SAFETY ISSUE IN THE EVENT AN ACCIDENT OR IN ANOTHER LIFE THREATENING SITUATION. ACCORDING TO THE MERCEDES BENZ SERVICE ADVISOR IN MY AREA, THE COST TO REPAIR THIS ISSUE IS UPWARDS OF $1300 BECAUSE THEY HAVE TO REPLACE THE ENTIRE DOOR PANEL. IF THIS IS HAPPENING TO SO MANY OF THESE VEHICLES THROUGH NO FAULT OF THE OWNER, SHOULDN'T THERE BE A RECALL ISSUED FOR THIS? WHY ARE THEY ACCEPTING PARTS THAT THEY KNOW TO BE DEFECTIVE?

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C300, Manufacturer: Mercedes-Benz USA, LLC
Incident: Aug 2018
Mar 2018

THE CAR RATTLES AND SHAKE WHEN STARTS WHICH CAUSE THE EMISSIONS SYSTEM TO WORK HARDER AND SEND OUT FUMES.

Type: Vehicle, Vehicle: 2012 MERCEDES BENZ C250, Manufacturer: Mercedes-Benz USA, LLC
Incident: Jan 2018

Trend Over Time

Complaints by year

Quick Summary

The 2012 Mercedes-Benz C-Class has 19 UNKNOWN OR OTHER complaints on file. Review the timeline above for detailed owner experiences.