2012 Mercedes-Benz C300 problems, complaints & recalls
Most-reported problem areas: Air Bags (107) · Suspension (57) · Structure:body (21)
🧭 Reliability snapshot
Compared against other Mercedes-Benz C300 model years — complaint volume vs the model's median year, recalls and severity. How we score →
🛣️ Complaints by mileage
74 NHTSA complaints that reported an odometer reading.
Safety recalls (6)
Air Bags:frontal:passenger Side:inflator Module 2020-05-22 · campaign 20V298000 · 640 vehicles
Defect: Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2012 C250, C250 Coupe, C300, C350, C350 Coupe, C63 AMG, and C63 AMG Coupe vehicles equipped with a front passenger air bag assembly replaced under a prior recall. An incorrect replacement front passenger air bag may have been installed.
Risk: An incorrect passenger air bag may not provide adequate protection, increasing the risk of injury in the event of a crash.
Fix: MBUSA will notify owners, and dealers will replace the passenger air bag module, free of charge. The recall began July 10, 2020. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2020060011.
Air Bags:frontal:passenger Side:inflator Module 2019-01-09 · campaign 19V010000 · 288,779 vehicles
Defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2014 C250, C300 4Matic, C350, C63 AMG, E350 4Matic Coupe, E350 Cabrio, E350 Coupe, SLS AMG Cabrio, SLS AMG Coupe, 2014-2015 C250 Coupe, C350 4Matic Coupe, C350 Coupe, C63 AMG Coupe, GLK 350, GLK250 BlueTec 4Matic, GLK350 RWD, 2015-2017 E400 4Matic Coupe, E400 Cabrio, E400 Coupe, 2014-2017 E550 Cabrio, and 2014-2016 E550 Coupe vehicles sold, or ever registered, in the states of AL, CA, FL, GA, HI, LA, MS, SC, TX, PR, AS, GU, the MP, and VI or "Z
Risk: An inflator explosion may result in sharp metal fragments striking the passenger or other occupants resulting in serious injury or death.
Fix: MBUSA will notify owners, and dealers will replace the passenger frontal air bag module, free of charge. The recall began March 29, 2019. Owners may contact MBUSA customer service at 1-800-367-6372.
Air Bags:frontal 2017-10-06 · campaign 17V627000 · 495,290 vehicles
Defect: Mercedes-Benz USA, LLC. (MBUSA) is recalling these vehicles: 2014-2018 CLA250, CLA250 4Matic, CLA45 AMG 4Matic, 2015-2018 GLA250, GLA250 4Matic, GLA45 AMG 4Matic, C300 4Matic, C63S AMG, 2012-2014 C250, C350, C300 4Matic, E550 4Matic, 2013-2014 C63 AMG, 2012-2015 C250 Coupe, C350 Coupe, C63 AMG Coupe, 2013-2015 C350 4Matic Coupe, GLK250 4Matic BlueTec, GLK350, GLK350 4Matic, 2016-2017 C350e, C43 AMG, 2015 C400 4Matic, 2016-2018 C63 AMG, GLC300, GLC300 4Matic, 2017-2018 C300 Coupe, C300 4Matic Cou
Risk: If the driver air bag inadvertently deploys, it can increase the risk of injury and a crash.
Fix: MBUSA will notify owners, and dealers will add sufficient grounding to the steering components, free of charge. The recall began in December 6, 2017. Owners may contact MBUSA customer service at 1-877-496-3691.
Electrical System:software 2017-03-14 · campaign 17V177000 · 51 vehicles
Defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 AMG GT-S, GLC300, CLA250 and GLE300d 4Matic vehicles, 2013 C250, E350 BlueTec and G63 AMG vehicles, 2008-2014 C300 vehicles, 2013-2014 C300 4Matic and ML350 4Matic vehicles, 2009 C350 vehicles, 2014 CLS550, E350 4Matic, E350 Coupe 4Matic, E350 Wagon 4Matic, GLK350 and SL550 vehicles, 2012 CLS550 4Matic vehicles, 2012-2016 E350 vehicles, 2016-2017 GL450 4Matic vehicles, 2012-2014 ML350 4Matic BlueTec vehicles, 2015 S550, S550 4Matic and C30
Risk: If the air bags do not deploy as intended in the event of a crash, there would be an increased risk of injury in the event of a crash.
Fix: MBUSA will notify owners, and dealers will update software in the affected control units, free of charge. The recall began April 21, 2017. Owners may contact MBUSA customer service at 1-800-367-6372.
Air Bags:frontal:passenger Side:inflator Module 2017-01-10 · campaign 17V017000 · 104,119 vehicles
Defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2012 C300 4Matic, C250, C250 Coupe, C350, C350 Coupe 4Matic, C350 Coupe, C63 AMG, C63 AMG Coupe, E350 Coupe 4Matic, E350 Cabrio, E350 Coupe, E550 Cabrio, E550 Coupe, GLK350 4Matic, GLK350, SLS AMG Cabrio, and SLS AMG Coupe vehicles originally sold, or ever registered, in Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the
Risk: An inflator rupture may result in metal fragments striking the vehicle occupants resulting in serious injury or death.
Fix: MBUSA will notify owners, and dealers will replace the front passenger air bag modules, free of charge. Owners were sent an interim notification in March 2017. Second notices started going out in October 2018 and continue to be mailed as parts become available. Owners may contact MBUSA customer service at 1-877-496-3691
Fuel System, Gasoline 2012-12-03 · campaign 12V557000 · 5,800 vehicles
Defect: Mercedes-Benz is recalling certain model year 2011-2012 S400, S550, S550 4Matic, S63 AMG, C300, C300 4Matic, E350, GLK350, GLK350 4Matic, CL550 4Matic, and CL63 AMG vehicles manufactured from April 18, 2011, through July 12, 2011. Due to an irregularity stemming from the molding process of the fuel filter flange, the fuel filter flange may crack when operated in high temperatures.
Risk: If the fuel filter flange cracks, it will leak fuel which may lead to a fire if an external ignition source is present.
Fix: Mercedes-Benz will notify owners, and dealers will replace the fuel filter, free of charge. The recall campaign is expected to begin in February 2013. Owners may contact Mercedes-Benz at 1-800-367-6372.
Service bulletins (104)
Technical service bulletins are repair instructions manufacturers send dealers for known issues. Unlike recalls, the fix is not automatically free — but naming the bulletin at the service desk can save diagnosis time and support goodwill repairs.
Service Brakes 2026-09-22 · LI42.10-P-078779 · Service Bulletin/Repair Instructions
complaint repeat workshop visit for vehicle vibration while braking from 60mph. note: although the symptom is similar to a tire or wheel vibration, it is usually readily noticeable that it is distinctly different if it happens at all times or only while braking. cause although the cause of the vibra
Structure:body 2026-09-14 · LI82.62-P-078631 · Service Bulletin/Repair Instructions
complaint clanking noise from the area of the speakers in the doors. cause under analysis. remedy to narrow down the cause, first of all remove the door trim. • if the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary,
Structure:body 2026-08-06 · LI82.62-P-078631 · Service Bulletin/Repair Instructions
complaint clanking noise from the area of the speakers in the doors. cause under analysis. remedy to narrow down the cause, first of all remove the door trim. • if the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and if necessary,
Power Train 2026-07-14 · LI35.30-P-058566 · Service Bulletin/Repair Instructions
single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end). the noise is heard once in each instance when changing direction of travel. note: sound file in attachment cause if the complaint is eliminated by experimentally loosening the outboard collar n
Suspension 2026-07-07 · LI33.20-P-078406 · Service Bulletin/Repair Instructions
complaint creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or creaking/crackling noises from the area of the wheel bearing on the front axle when cornering/ maneuvering. sound file attached for comparison. must match noise for proper diagnos
Visibility/Wiper 2026-05-19 · LI82.30-P-059239 · Service Bulletin/Repair Instructions
complaint there are several types of complaint about noises or poor windshield wiper wiping performance: a: wiper blades squeaking, chattering, shuddering b: the windshield is not wiped completely (streaking) c: during the downward movement water is pulled back onto the windshield from the a-pillar
Showing the 6 most recent of 104 bulletins. Search all of them free at nhtsa.gov.
What owners report
2026-10-24 · Structure:body“did a winter inspection of vehicle and found rust on the rear frame. rust has already made a hole on the subframe and hair line crack already forming, only a matter of time before it brakes.…”
2026-09-12 · Fuel/Propulsion System“fuel tank is rusting. leaking fuel, heavy fuel smell inside cabin. my saftey and anyone around the vehicle would be at risk due to fire chance. confirmed by independent service center vehcile has only been inspected by me and the shop only symptom that appeared was fuel smell in my garage and a puddle of gasoline underneath the vehicle. …”
2026-08-24 · Suspension“the rear sub frame has rusted and part of it has failed…”
2026-05-19 · Fuel/Propulsion System“vehicle: 2012 mercedes-benz c300 4matic sport problem component: fuel / propulsion system safety issue description: my 2012 mercedes-benz c300 developed a serious fuel tank leak at approximately 106,460 miles which created overwhelming gasoline fumes and rendered the vehicle unsafe to operate. the gasoline fumes were extremely strong and entere…”
2026-04-19 · Suspension“i have a rust free, relatively lower mileage car i bought for my teen daughter. despite being such a clean car the rear subframe has rusted and rear suspension has broke off while driving, hitting the fuel tank and is unstable. we avoided an accident but the car is not drivable. …”
2025-11-24 · Suspension“mercedes of danbury replaced the rear sub frame code 3441 47, since my mechanic (newtown auto repair) told me that the front subframe is in real bad shape, rotten/rusted, that it is dangerous to drive the car in this condition since the wheel and steering components are part and attached to it, the car would be out of control and all over the road …”
2025-10-28 · Fuel System, Gasoline · 98,000 mi“the contact owns a 2012 mercedes-benz c300. the contact stated the fuel tank was emitting a fuel odor. the contact stated that the fuel odor was extremely strong and could be smelled inside the residence while the vehicle was parked in the garage. there were no warning lights illuminated. the vehicle was taken to a certified mechanic, who diagnosed…”
2025-08-20 · Unknown Or Other“rear subframe rotted out and broke due to corrosion. rear crossmember is broken and needs replaced. my safety as well as the safely of other was put at risk. loss of control at high speed could have been deadly. luckily, i wasn’t going very fast at the time of incident or else who knows what would have happened to me or bystanders. independent s…”
2025-07-16 · Suspension“rear subframe crossmember rotting, needs replacement. it seems to be a common problem with this vehicle and the assumption by most professional is that it a faulty part supplied by a third party to mercedes. the rest of the cars undercarriage is pristine, making me wonder why just this one part would rust out.…”
2025-07-14 · Air Bags“i was driving normally last week when the driver's head restraint system (known by mercedes as neck pro) unexpectedly and without warning blew at my head. the noise was very loud, and the headrest slammed against my head. luckily, i was driving approximately 20-25 miles per hour, daytime, on a residential street without too many other vehicles. …”
Excerpts of consumer complaints filed with NHTSA, lightly truncated. They are owner statements, not verified findings.