Total Complaints
118 filings
MERCEDES-BENZ C300 · model year
118 NHTSA complaints, 7 crash reports for this specific cohort.
NHTSA overall rating
Not crash-tested
New Car Assessment Program
The 2014MERCEDES-BENZC300 carries 118 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 7 crashes, 0 fires, 5 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.
Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2014 C300 is air bags with 52 filings, followed by steering (12) and suspension (11). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.
NHTSA currently has 15 investigation files overlapping the 2014 C300. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.
Total Complaints
118 filings
Crashes Reported
7 reports
Source
NHTSA ODI
Federal complaints database
At or below the fleet median complaint volume.
| Component | Count |
|---|---|
| AIR BAGS | 52 |
| STEERING | 12 |
| SUSPENSION | 11 |
| UNKNOWN OR OTHER | 8 |
| ELECTRICAL SYSTEM | 7 |
| STRUCTURE:BODY | 7 |
| VEHICLE SPEED CONTROL | 3 |
| SERVICE BRAKES | 2 |
| SEATS | 2 |
| ENGINE | 2 |
| STRUCTURE:BODY:DOOR:HANDLE:INTERIOR | 2 |
| TIRES | 1 |
| POWER TRAIN | 1 |
| VISIBILITY/WIPER | 1 |
| AIR BAGS:FRONTAL:DRIVER CLOCKSPRING/SPIRAL CASSETTE | 1 |
Leaving my home from my driveway and driving about 15 feet I heard a loud pop from my backseat area and noticed my Headrest on drivers side deployed without any reason. The airbag right/left malfunction light showed on my dash saying service required. Mercedes benz Dealership said they never heard of this. The dealership Removed old headrest and replaced with a new one , reset malfunction light and a fuse. Price was enormous.
The left rear subframe separated from the main frame causing the car to pull to the left when braking. I had an episode where I was stopping for a traffic light and the car started fishtailing and I almost lost control of the car. Following this episode, I took the car to a mechanic who advised me that the car was unsafe to drive. My mechanic also told me that he has repaired a number of these vehicle with the same problem, and that Mercedes Benz has extended their warranty from 4 years 50,000 miles to 20 years unlimited mileage. They did the extension after someone filed a class action suit in Georgia about the problem. The vehicle is presently at a Mercedes dealer awaiting the new subframe.
To Whom It May Concern, I am seeking assistance regarding my 2014 Mercedes-Benz C-300, VIN [XXX] . I repurchased this vehicle from the London Nissan Dealership on [XXX]. It currently has about 120,000 miles, and I have driven an additional 15,000 miles in the past two years. Less than three months after purchase, I took the car to a Mercedes-Benz dealership in Knoxville, TN, for repairs on May 16th. Now, my vehicle is at James Motor Company in Lexington, KY, where they diagnosed a faulty steering column that needs replacement at a cost of $1,630.00. I have already taken this car to the dealership twice for issues in under two years. The problems began when the vehicle wouldnât start one morning; the steering column was locked despite a fully charged battery. This failure could have led to a serious accident, especially since I drive frequently for work and school. There were no warning signs prior to this incident. The dealership has confirmed the steering column issue and can pr
It's the ESL ELECTRIC STEERING LOCK THIS PART IS KNOWN TO BE DEFECTIVE AND IS POSTED ONLINE TO FIX AND ALSO BYPASS IT. I AM NOT A MECHANIC SO I AM TOLD PART ALONE IS $570 AT MERCEDES THEY HAVE TO PROGRAM IT. THIS PART IS KNOW TO BREAK AND ONLY THEY CAN REPROGRAM IT. THIS SHOULD BE A SAFTY ISSUE. THE CAR RTDOES NOT START BECAUSE OF IT AND IT LOCKS THE STEERING WHEEL IN PLACE. THE CODE FOR IT ON CAR IS A25464 code on car. This is a known problem and it makes the car undrivable. I don't have files but had car toed 2 times. I will have recept after it's fixed
The contact owns a 2014 Mercedes-Benz C300. The contact stated that an unidentified recall was previously completed on the vehicle; however, the recall remedy failed to prevent the failure from occurring. The contact stated that while driving at undisclosed speeds, the steering wheel locked. No warning light was illuminated. The vehicle was towed to a local dealer, where it was diagnosed and determined that the electronic steering lock and the TRP needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 158,000.
Mileage: 158,000
The contact owns a 2014 Mercedes-Benz C300. The contact stated that an unidentified recall was previously completed on the vehicle; however, the recall remedy failed to prevent the failure from occurring. The contact stated that while driving at undisclosed speeds, the steering wheel locked. No warning light was illuminated. The vehicle was towed to a local dealer, where it was diagnosed and determined that the electronic steering lock and the TRP needed to be replaced. The vehicle was not repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 158,000.
Mileage: 158,000
Rotted rear sub frame due to poor design retaining water
I purchased my vehicle from the Mercedes Benz Dealership and received a recall letter in the mail stating that driver side deployment may occur. After receiving notice I brought the car to the dealership to get the recall repaired. I've been driving around with a false sense of security believing that this issue was repaired. However, recently, while I was driving the driver side airbag unexpectedly and abruptly deployed and injured me. This is a major safety concern and car owners should be notified and made aware that the issue can still occur after the recall was repaired. I contacted Mercedes Benz and they did not issue any additional notices to inform customers of possible recall issue reoccurring due to manufacturer defects even after the repair was made. Additionally, I believe the driver side Takata airbag/inflators may have also been defective because of the injuries I incurred from the forceful explosive eruption of the airbag. MBUSA Campaign Number 2017120024 NHTSA Rec
I purchased my vehicle from the Mercedes Benz Dealership and received a recall letter in the mail stating that driver side deployment may occur. After receiving notice I brought the car to the dealership to get the recall repaired. I've been driving around with a false sense of security believing that this issue was repaired. However, recently, while I was driving the driver side airbag unexpectedly and abruptly deployed and injured me. This is a major safety concern and car owners should be notified and made aware that the issue can still occur after the recall was repaired. I contacted Mercedes Benz and they did not issue any additional notices to inform customers of possible recall issue reoccurring due to manufacturer defects even after the repair was made. Additionally, I believe the driver side Takata airbag/inflators may have also been defective because of the injuries I incurred from the forceful explosive eruption of the airbag. MBUSA Campaign Number 2017120024 NHTSA Rec
I purchased my vehicle from the Mercedes Benz Dealership and received a recall letter in the mail stating that driver side deployment may occur. After receiving notice I brought the car to the dealership to get the recall repaired. I've been driving around with a false sense of security believing that this issue was repaired. However, recently, while I was driving the driver side airbag unexpectedly and abruptly deployed and injured me. This is a major safety concern and car owners should be notified and made aware that the issue can still occur after the recall was repaired. I contacted Mercedes Benz and they did not issue any additional notices to inform customers of possible recall issue reoccurring due to manufacturer defects even after the repair was made. Additionally, I believe the driver side Takata airbag/inflators may have also been defective because of the injuries I incurred from the forceful explosive eruption of the airbag. MBUSA Campaign Number 2017120024 NHTSA Rec
While I was driving my car the driver side airbag abruptly deployed. The airbag inadvertently deployed; the car did not crash into anything to cause the airbag to deploy. When the airbag erupted it caused injury to my head, face, hand, arm and wrist. I believe the airbag is defective because I have lacerations on my face possibly due to sharp objects ejecting from the airbag and the impact as well as excessive smoke and fumes emitted after the fact. I believe there might be a manufacturing defect in the airbag because it seemed as if it exploded with excessive force causing harm to myself as well as inadvertent eruption. There have been some recalls issued on the motor vehicle and I did take the vehicle to the Mercedes car dealership to get all of the recalls repaired, however this incident occurred after the repairs were made at the dealership.
While I was driving my car the driver side airbag abruptly deployed. The airbag inadvertently deployed; the car did not crash into anything to cause the airbag to deploy. When the airbag erupted it caused injury to my head, face, hand, arm and wrist. I believe the airbag is defective because I have lacerations on my face possibly due to sharp objects ejecting from the airbag and the impact as well as excessive smoke and fumes emitted after the fact. I believe there might be a manufacturing defect in the airbag because it seemed as if it exploded with excessive force causing harm to myself as well as inadvertent eruption. There have been some recalls issued on the motor vehicle and I did take the vehicle to the Mercedes car dealership to get all of the recalls repaired, however this incident occurred after the repairs were made at the dealership.
While I was driving my car the driver side airbag abruptly deployed. The airbag inadvertently deployed; the car did not crash into anything to cause the airbag to deploy. When the airbag erupted it caused injury to my head, face, hand, arm and wrist. I believe the airbag is defective because I have lacerations on my face possibly due to sharp objects ejecting from the airbag and the impact as well as excessive smoke and fumes emitted after the fact. I believe there might be a manufacturing defect in the airbag because it seemed as if it exploded with excessive force causing harm to myself as well as inadvertent eruption. There have been some recalls issued on the motor vehicle and I did take the vehicle to the Mercedes car dealership to get all of the recalls repaired, however this incident occurred after the repairs were made at the dealership.
The driver's side interior door handle became disengaged as I was trying to open the door so I was momentarily trapped inside. If I had been in a situation where I had been in an accident and needed to get out quickly, or the car had been on fire, or I was stalled on the train tracks, this could have been a serious incident. When I googled this, it sounds like this is a very common occurrence in Mercedes. There was no warning that this was going to occur - everything seemed secure before this happened. I have taken it to a service center for a very expensive repair as they have to remove the door panel, replace/reattach the part and put the door panel back.
took car in for oil change and was informed that car should not be driven because rear subframe had rotted thru and rear link was completly unattached and hitting gas tank. havent had a response from 2 dealerships this car is unstable and hitting the brakes requires a lot of attention to keep on road
Rear sub frame rusting through
The intake manifold blew on my car while it was off overnight and I took it to the Mercedes dealership to have it fix and the next day I got it back after it was repaired the same problem happened again when I went to unlock my car I heard a bang and smoke coming from the engine
The intake manifold blew on my car while it was off overnight and I took it to the Mercedes dealership to have it fix and the next day I got it back after it was repaired the same problem happened again when I went to unlock my car I heard a bang and smoke coming from the engine
The ignition switch is causing the steering column to lock and it has been reported a lot at different dealerships that I have called.
The driver's side door handle broke impossible to open door from inside if there was an accident. I have been told that this is a common problem with my car, and that it cost 1600.00 to replace repair at the dealer. This is such a common problem that there are after market kits to repair the broken handle for 20.00, but including labor the repair is $500.00.
Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.
Read our methodology — how this data is sourced, computed, and verified.