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10.0

really awful
Crashes / Fires:
2 / 0
Injuries / Deaths:
4 / 0
Average Mileage:
39,898 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2009 Mercedes-Benz C300 engine problems

engine problem

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2009 Mercedes-Benz C300 Owner Comments

problem #8

May 272020

C300 6-cyl

  • 85,000 miles

A D V E R T I S E M E N T S

My car every so often won"T start battery is good starter is good just does nothing happened over 10X had it towed to 5 mechanics shops and Mercedes can"T diagnose problem because after a day maybe two sometimes 4 or 5 the car will just start up on its own and then a few weeks or months we go through it all over again researched and other Mercedes C300 drivers have the same problem for months and its the steering lock module.

- Cape Coral, FL, USA

problem #7

Oct 152018

C300

  • 70,000 miles
The instrument cluster on my Mercedes C300 has died. The speedometer is broken, so I can not tell how fast my car is going. I also have no idea how much gas I have in the car nor oil pressure or engine temperature or rpms. This seems dangerous to me.

- Columbia, SC, USA

problem #6

Aug 172017

C300

  • 59,000 miles
Car was driving very well suddenly flashes on message center power steering malfunction SRS, ABS, ets, esb, ebr esp in operative and it keeps flashing when car is in motion, then disappear when ignition is off, I have notice several complaints on your website with this same issues with this same year, model and other Mercedes, a week a go I also receive a message to check brake pad wear before this message came up. I replace brake pads and rotos, and I am also being told it could also be my brake light switch or speed sensors, all was replace still as message. There is so many complaints with these messages that this should be considered a recall and the customers are being stuck with the repairs. It is obvious that it is a defect with these vehicles it is just too many. And no onw seems to be standing behind the consumers.mbusa is a major company and they are getting away with murder. Do you have to have major fatality before they do something about this problem. Does saving money means more than peoples lives it is just too many complaints on the same problems that common sense cant tell them it is a defect and the nhts should step up for us and demand a recall. How many complaints do you have to have in order for mbusa make this a recall.

- Dorchester, MA, USA

problem #5

Jan 042014

C300

  • 38,500 miles

A D V E R T I S E M E N T S

The contact owns a 2009 Mercedes Benz C300. The contact stated that the engine rpms increased excessively and the vehicle suddenly accelerated without warning as the contact attempted to brake. The contact mentioned that the vehicle eventually decelerated and responded to braking attempts. The vehicle was not taken to a dealer for diagnostic testing. The manufacturer was not notified of the failure. The vehicle was not repaired. The approximate failure and current mileage was 38,500.

- Dublin, GA, USA

problem #4

Dec 032012

C300 6-cyl

  • Automatic transmission
  • 35,660 miles
The contact owns a 2009 Mercedes Benz C300. The contact stated that while at the dealer he slowed the vehicle down in order to drive through an automatic door when sudden acceleration occurred causing the contact to crash into the door. The driver and two other people were injured. They were all taken to the hospital with injuries to the thigh, leg, and a bruised collar bone. The vehicle was destroyed. The insurance company was notified of the failure. A police report was filed. The manufacturer was notified and stated there was no acceleration failure or any related recalls. The contact stated the fly by wire caused the acceleration. The failure mileage was 35,660. Updated 02/07/13

- Rochelle, VA, USA

problem #3

Nov 162010

C300 6-cyl

  • 10 miles
I own a 2009 Mercedes Benz, model C-300. The issue is the location of the cruise control arm on the left side of the steering column. In America cars the turn signal arm is in that spot on the top, in this car it is on the top. So if you reach for the turn signal arm you touch the cruise control arm first by mistake. As soon as you touch the cruise control is engaged and stats taking over. A very grave safety hazard.

- Chico, CA, USA

problem #2

May 222010

C300

  • 9,010 miles
At 5:00pm, I was driving the Mercedes Benz C300, year 2009, 9010 miles in the parking lot of ymca in la Canada, ca at 3 miles/hr. I prepared to stop the car and stepped on the brake, suddenly, the engine rev up and accelerated. The car jumped over the stop bumper but I pressed very hard on the brake and finally the car stopped and the engine was off. The front of the car was about 2 feet from the wall at the parking lot. I was so scared because it was the first time I experienced the unintended acceleration. I went to the gym and at 6:30pm I drove the car back home, it is about 6 miles from my house. I really feel unsafe with my almost brand new mb. I'll take off for work next Monday and will take the car to the dealer for checking. I was lucky this time with no damage or injury because I was driving very slowly in the parking lot and ready to stop. However I don't want to take the chance next time, it's so dangerous, I can get kill or somebody can get hurt if my car jumps again. I do the research and see the complaint # 10330370 on 05/23/2010. The case was almost the same: When the driver stepped on the brake and the mb unintended accelerated. Please do the investigation by now and feel free to contact me anytime.

- La Crescenta, CA, USA

problem #1

May 132010

C300

  • 22,000 miles
I was driving on the parkway at ~40 mph and attempted to slow down by stepping on the brake. The car did not slow down but accelerated. And struck the car in front of me. Every time I pressed on the brake, the car accelerated so that the car struck the car in front twice. I tried to turn off the ignition and was unable to. Finally, I pushed hard on the brake enough to slow it down and I was ten able to put the car in neutral. The engine raced but I was then able to turn it off. Despite damage to the front of the vehicle, the airbags did not deploy.

- Great Neck, NY, USA

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