MERCEDES-BENZ C300 · model year

2009 MERCEDES-BENZ C300

842 NHTSA complaints, 22 crash reports for this specific cohort.

NHTSA overall rating

Not crash-tested

New Car Assessment Program

The 2009MERCEDES-BENZC300 carries 842 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 22 crashes, 30 fires, 19 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 2009 C300 is electrical system with 193 filings, followed by air bags (181) and steering (135). 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 2009 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.

842
Complaints
22
Crashes
30
Fires
19
Injuries
0
Deaths

Total Complaints

842 filings

Crashes Reported

22 reports

Source

NHTSA ODI

Federal complaints database

Complaints vs. fleet median (215)

Above median complaint volume — review patterns below.

Complaints by Component

ComponentCount
ELECTRICAL SYSTEM193
AIR BAGS181
STEERING135
EXTERIOR LIGHTING112
SUSPENSION35
UNKNOWN OR OTHER31
ELECTRONIC STABILITY CONTROL (ESC)20
SERVICE BRAKES19
STRUCTURE:BODY17
ENGINE16
VEHICLE SPEED CONTROL8
SEAT BELTS8
TIRES7
ENGINE AND ENGINE COOLING5
POWER TRAIN5

Recent Complaints

20251012STRUCTURE:BODY

Vehicle inspection by independent service center indicated that a new rear frame was necessary. This was the second communication to nhtsa on this issue. This automobile (2009 c300) is inoperable due to this Mercedes rear frame defect .

20250617STEERING

The problem is that the steering wheel locking mechanism has failed. The vehicle could not be started or driven. It required a flatbed tow to an authorized Mercedes repair facility. It was diagnosed as the steering mechanism, requiring replacement. The cost for this repair is $1400.00. I researched this problem on the MB website and it stated that this issue was common. I feel that this is a safety issue and should be repaired free of charge or at a significant discount. The car is currently being repaired, and I can forward any relevant documentation to you once the repair is complete.

20250306ELECTRICAL SYSTEM

While driving the car on [XXX] at 9pm on sunday, [XXX] in lane two during a heavy rain a audible clicking noise came from the drivers side front of the dash instrument cluster area and all of the lights on the car simultaneously turned off without ever touching the light switch i was unable to see the road in front of the vehicle also the windshield wipers quit working and the radio and navigation display went off and closed and opened and closed( turned off and then on and off again) the instrument cluster went dark as well, luckily i was able to turn the steering and apply the brakes and steer the vehicle onto the shoulder of the road and come to a complete stop after several attempts to turn the headlights back on i determined that the vehicle was not safe to drive , and had the vehicle towed to a reputable mechanic, and upon diagnosis he contacted me and stated that the drivers side front signal acquisition module A. K. A. the (sam) module had failed due to water intrusion into t

20250106ELECTRICAL SYSTEM

Check Right Tail and Brake Lamps warning light will not go off for months. They are working fine but the light won't go off. Googling on MB World, it shows Mercedes is aware of this problem and a recall is needed to get it corrected being safety issue with warning lights not working properly. See all info. below from owners, conversations and work done by dealers, etc. People note it is a middle school education problem. Please alert me when the recall is confirmed to get this important problem fixed. [XXX] Thank you, [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

20250106EXTERIOR LIGHTING

Check Right Tail and Brake Lamps warning light will not go off for months. They are working fine but the light won't go off. Googling on MB World, it shows Mercedes is aware of this problem and a recall is needed to get it corrected being safety issue with warning lights not working properly. See all info. below from owners, conversations and work done by dealers, etc. People note it is a middle school education problem. Please alert me when the recall is confirmed to get this important problem fixed. [XXX] Thank you, [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

20250106UNKNOWN OR OTHER

Check Right Tail and Brake Lamps warning light will not go off for months. They are working fine but the light won't go off. Googling on MB World, it shows Mercedes is aware of this problem and a recall is needed to get it corrected being safety issue with warning lights not working properly. See all info. below from owners, conversations and work done by dealers, etc. People note it is a middle school education problem. Please alert me when the recall is confirmed to get this important problem fixed. [XXX] Thank you, [XXX] [XXX] INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

20241221SERVICE BRAKES

Went to the Mercedes dealership service department to replace the rear subframe that suddenly broke while I was driving due to extreme rust/corrosion. The dealership stated that it was being covered under the extended warranty due to the recall related to the rust/corrosion issue with the subframe. I was advised by the mechanic that the brake lines will need to be replaced due to extreme rust/corrosion in the rear at the same exact location of the rear subframe, making the vehicle very dangerous to drive because the brake lines could break at any moment and cause sudden brake failure. I was quoted a very significant amount to replace the rusted brake lines and per the dealership, it will not be covered under any extended warranty and/or recall.

20241112STRUCTURE

The contact owns a 2009 Mercedes-Benz C300. The contact stated that while driving at various speeds, the rear end of the vehicle would fishtail and become extremely unstable while driving over a bump in the road or while turning. Upon inspection, the contact discovered that the subframe was severely rusted. The cause of the failure was not determined, and the vehicle was not yet repaired. The local dealer was notified of the failure. The manufacturer was not contacted. The failure mileage was 201,000.

Mileage: 201,000

20240918ELECTRICAL SYSTEM

I drove my car to get lunch. Came back out to go back to work and the car would not start. Would not even turn over. My Radio did not turn on and I couldn't even roll my windows back up. Luckily they were only cracked open a small amount. My steering wheel cannot be turned, it's locked in it's current position. I am told the ESL (Electronic Steering Lock) and possibly the EIS is the cause of this problem. The display on the dash says "Take your key from ignition" and that is all I get. Had to have my car towed and now I have a dead car with the windows partially open that I cannot close.

20240918STEERING

I drove my car to get lunch. Came back out to go back to work and the car would not start. Would not even turn over. My Radio did not turn on and I couldn't even roll my windows back up. Luckily they were only cracked open a small amount. My steering wheel cannot be turned, it's locked in it's current position. I am told the ESL (Electronic Steering Lock) and possibly the EIS is the cause of this problem. The display on the dash says "Take your key from ignition" and that is all I get. Had to have my car towed and now I have a dead car with the windows partially open that I cannot close.

20240918POWER TRAIN

I drove my car to get lunch. Came back out to go back to work and the car would not start. Would not even turn over. My Radio did not turn on and I couldn't even roll my windows back up. Luckily they were only cracked open a small amount. My steering wheel cannot be turned, it's locked in it's current position. I am told the ESL (Electronic Steering Lock) and possibly the EIS is the cause of this problem. The display on the dash says "Take your key from ignition" and that is all I get. Had to have my car towed and now I have a dead car with the windows partially open that I cannot close.

20240904EXTERIOR LIGHTING

Headlight harness on drivers and passenger side is melting and my lights are flickering. I was advised to night drive my vehicle at night, because it could start an electrical fire. This is caused by heat from the lights.

20240904ELECTRICAL SYSTEM

Headlight harness on drivers and passenger side is melting and my lights are flickering. I was advised to night drive my vehicle at night, because it could start an electrical fire. This is caused by heat from the lights.

20240826EXTERIOR LIGHTING

The contact owns a 2009 Mercedes-Benz C300. The contact stated while driving and activating the turn signals, the taillights were inoperable. Additionally, the contact stated while driving and depressing the brake pedal to come to a stop, the brake lights were significantly dimmed except for the third brake light. The vehicle was taken to the dealer, where it was diagnosed with electrical failure. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 14V177000 (Exterior Lighting); however, the VIN was not included. The manufacturer was notified of the failure and informed the contact that they could not assist because the VIN was not included in the recall. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was unknown.

20240826SERVICE BRAKES

The contact owns a 2009 Mercedes-Benz C300. The contact stated while driving and activating the turn signals, the taillights were inoperable. Additionally, the contact stated while driving and depressing the brake pedal to come to a stop, the brake lights were significantly dimmed except for the third brake light. The vehicle was taken to the dealer, where it was diagnosed with electrical failure. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 14V177000 (Exterior Lighting); however, the VIN was not included. The manufacturer was notified of the failure and informed the contact that they could not assist because the VIN was not included in the recall. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was unknown.

20240826ELECTRICAL SYSTEM

The contact owns a 2009 Mercedes-Benz C300. The contact stated while driving and activating the turn signals, the taillights were inoperable. Additionally, the contact stated while driving and depressing the brake pedal to come to a stop, the brake lights were significantly dimmed except for the third brake light. The vehicle was taken to the dealer, where it was diagnosed with electrical failure. The vehicle was not repaired. The contact related the failure to NHTSA Campaign Number: 14V177000 (Exterior Lighting); however, the VIN was not included. The manufacturer was notified of the failure and informed the contact that they could not assist because the VIN was not included in the recall. The manufacturer referred the contact to the NHTSA Hotline for assistance. The failure mileage was unknown.

20240705STRUCTURE:BODY

The entire rear subframe of any W205 body model including but not limited to the C class from 2009-2014, CL class, SL, class ETC. suffers admittedly from MB USA, premature rust, deterioration etc. there is an active recall for these same models in Canada and all of Europe but not the USA. My garage kept 2009 C300 has suffered extensive rear end damage from a factory defect that Mercedes refuses to recognize in the Continental U.S. but will admit the same issues occurred in the EU and Canada. Keeler Mercedes, USA, of Colonie New York, stated they completed my subframe repair under the MB rear subframe extended warranty. The vehicle was driven home and inspected only to find out Keeler Mercedes of NY did NOT replace this crucial safety component under MB-USA extended warranty issued for this defect. This is pure negligence. When asked why the subframe wasn’t replaced as the work order stated it did, they stated “a mix up in paper work” I believe Mercedes-Benz USA and Keeler Mercede

20240705SUSPENSION

The entire rear subframe of any W205 body model including but not limited to the C class from 2009-2014, CL class, SL, class ETC. suffers admittedly from MB USA, premature rust, deterioration etc. there is an active recall for these same models in Canada and all of Europe but not the USA. My garage kept 2009 C300 has suffered extensive rear end damage from a factory defect that Mercedes refuses to recognize in the Continental U.S. but will admit the same issues occurred in the EU and Canada. Keeler Mercedes, USA, of Colonie New York, stated they completed my subframe repair under the MB rear subframe extended warranty. The vehicle was driven home and inspected only to find out Keeler Mercedes of NY did NOT replace this crucial safety component under MB-USA extended warranty issued for this defect. This is pure negligence. When asked why the subframe wasn’t replaced as the work order stated it did, they stated “a mix up in paper work” I believe Mercedes-Benz USA and Keeler Mercede

20240705STEERING

The entire rear subframe of any W205 body model including but not limited to the C class from 2009-2014, CL class, SL, class ETC. suffers admittedly from MB USA, premature rust, deterioration etc. there is an active recall for these same models in Canada and all of Europe but not the USA. My garage kept 2009 C300 has suffered extensive rear end damage from a factory defect that Mercedes refuses to recognize in the Continental U.S. but will admit the same issues occurred in the EU and Canada. Keeler Mercedes, USA, of Colonie New York, stated they completed my subframe repair under the MB rear subframe extended warranty. The vehicle was driven home and inspected only to find out Keeler Mercedes of NY did NOT replace this crucial safety component under MB-USA extended warranty issued for this defect. This is pure negligence. When asked why the subframe wasn’t replaced as the work order stated it did, they stated “a mix up in paper work” I believe Mercedes-Benz USA and Keeler Mercede

20240606AIR BAGS

The contact owns a 2009 Mercedes-Benz C300. The contact stated that while driving at an undisclosed speed, the "SRS System Requires Service" was displayed. The air bag and check engine warning lights were illuminated. The vehicle was taken to the dealer, who diagnosed a failure with the vapor canister shutoff valve but had not provided a diagnosis for the SRS system. The vehicle was repaired. The manufacturer was notified of the failure, and a case was opened. The failure mileage was 99,000.

Mileage: 99,000

Compare 2009MERCEDES-BENZC300 to Similar Vehicles

NHTSA Investigations

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Frequently Asked Questions

How many complaints does the 2009 MERCEDES-BENZ C300 have?
The 2009 MERCEDES-BENZ C300 has 842 NHTSA complaints, 22 crashes, 30 fires, 19 injuries, and 0 deaths reported.
What are the most common problems with the 2009 MERCEDES-BENZ C300?
The most-complained component for the 2009 MERCEDES-BENZ C300 is ELECTRICAL SYSTEM with 193 complaints. Other frequently reported areas include AIR BAGS and STEERING.
Is the 2009 MERCEDES-BENZ C300 safe to buy?
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.

Vehicle Safety Guides

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.