NHTSA (USA)Critical
At a glance
This page covers 5 recalls, 479 owner complaints and EPA fuel economy for the 2011 Mercedes-Benz C300.
20–21 mpg combined
11.2–11.8 L/100km
Compact Cars
Fuel economy data from fueleconomy.gov (EPA / U.S. Dept. of Energy). Annual cost based on 15,000 mi/yr at 55% city driving and current fuel prices. MPG is U.S. gallons; L/100km converted. Ranges reflect the 3 tested variants for this model year.
For the 2011 Mercedes-Benz C300, the single dominant pattern in owner complaints is the airbag system, which accounts for nearly half of all reported issues. Owners most commonly describe the airbag warning light illuminating and staying on, with many reporting that the system appears to deactivate or behave unexpectedly without any collision event. Suspension complaints form the second-largest group, with owners describing clunking, excessive wear, and premature failure of control arms and other front-end components. A recurring structural concern involves corrosion, specifically brake lines and backing plates rusting through well ahead of what owners consider normal, sometimes to the point of brake fluid loss while the car is parked. Several owners also report the electronic steering lock module failing and leaving the car unable to start, requiring expensive repairs to restore basic ignition function.
479
Total Complaints
15
Crash-Related
6
Fire-Related
11
With Injuries
By System
The 2011 Mercedes-Benz C300 has 5 recalls, the most serious being a Takata airbag inflator defect affecting both the driver and passenger sides, where the inflators can rupture in a crash and send metal fragments through the cabin.
The airbag inflator concern accounts for four of the five recalls and covers both frontal positions. On the driver side, the inflator can explode during deployment and scatter metal fragments toward the driver or other occupants. The same risk applies to the passenger-side inflator, which has been the subject of multiple filings covering different model years and geographic registrations. Some of these filings specifically apply to vehicles that were sold or registered in high-humidity states such as Florida, Hawaii, and Louisiana, where moisture accelerates the degradation of the inflator propellant. In all cases, the consequence is the same: a crash that should trigger the airbag instead produces a burst of metal. Prior repair attempts did not fully resolve the passenger-side issue across all affected vehicles, which is why multiple campaigns exist for what is essentially the same underlying defect.
The fifth recall involves a software issue in the airbag control system. A fault in the software can prevent the airbags from deploying correctly in a crash, reducing the protection the restraint system would otherwise provide. This recall covers a wide range of Mercedes-Benz models across multiple years, with the C300 appearing in the affected vehicle list for the 2008 through 2014 model years.
At a glance
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
What can fail
The passenger front air bag inflator may explode due to propellant breaking down after prolonged exposure to high humidity, heat, and temperature changes.
What the fix does
Dealers will replace the passenger front air bag module at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The passenger front air bag inflator may explode during a crash. This can happen because the inflator's propellant degrades after prolonged exposure to humidity and temperature changes.
What the fix does
The dealer will replace the passenger front air bag module at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Control unit software may be incorrect, potentially preventing airbags from deploying properly during a crash.
What the fix does
Dealers will update the control unit software at no cost to restore proper airbag deployment function.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The passenger front air bag inflators may rupture during a crash because the propellant inside degrades over time when exposed to humidity and temperature changes.
What the fix does
Dealers will replace the passenger front air bag modules at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The driver's front air bag inflator may build up excessive pressure and rupture when the air bag deploys.
What the fix does
Dealers will replace the driver's front air bag module at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.