Is the 2009 Mercedes-Benz C 300 a bad year?
575 owner complaints to NHTSA. Engine and transmission complaints are in line with other C 300 years.
Keep it
Engine and transmission complaints for the 2009 Mercedes-Benz C 300 are in line with other C 300 years. Electrical system, air bags, steering and 1 more stand out for this year: see below.
The verdict moves with mileage: the same car reads differently at 30,000 and at 150,000 miles.
What 2009 C 300 owners report, by mileage
Each system owners named in five or more complaints, with the mileage range where the middle half of those complaints were filed. Read at 71,000 miles.
| SYSTEM | COMPLAINTS | MIDDLE HALF FILED AT | TYPICAL US REPAIR BILLS |
|---|---|---|---|
| Electrical systemSTANDS OUT | 198 (34%) | 55k–90k miles · around this mileage | 12-volt battery replacement $100–$400 · Starter motor replacement $350–$1,200 |
| Air bagsSTANDS OUT | 182 (32%) | 60k–86k miles · around this mileage | — |
| SteeringSTANDS OUT | 136 (24%) | 58k–90k miles · around this mileage | Steering rack and pinion replacement $700–$2,100 |
| Exterior lightingSTANDS OUT | 117 (20%) | 50k–72k miles · around this mileage | — |
| Body structure | 27 (5%) | 60k–97k miles · around this mileage | — |
| Brakes | 21 (4%) | 50k–85k miles · around this mileage | Brake pad replacement (one axle) $115–$390 · Brake pads and rotors replacement (one axle) $200–$1,084 |
| Engine | 21 (4%) | 63k–96k miles · around this mileage | Valve cover gasket replacement $110–$500 · Timing chain replacement $1,000–$4,000 |
| Stability control | 20 (3%) | 63k–118k miles · around this mileage | — |
| Seat belts | 8 (1%) | 58k–90k miles · around this mileage | — |
| Fuel system | 5 (1%) | 50k–100k miles · around this mileage | Fuel pump replacement $220–$1,500 · Fuel injector replacement (one injector) $300–$1,200 |
| Transmission and drivetrain | 5 (1%) | 44k–75k miles · around this mileage | CV axle / CV joint replacement (one side) $300–$1,500 · Automatic transmission replacement $2,500–$7,000 |
| Suspension | 36 (6%) | 78k–120k miles · ahead | Ball joint replacement (one joint) $200–$500 · Control arm replacement (one arm) $200–$900 |
| Tires | 9 (2%) | too few with a mileage | — |
| Speed control | 8 (1%) | too few with a mileage | — |
Bills are typical US ranges from the sources named in the tool (J.D. Power, Kelley Blue Book, CarParts.com and others), printed only for systems that stand out or sit at or ahead of 71,000 miles. Not a quote.
What owners reported alongside their complaints
Of 575 complaints: 14 mention a crash · 18 mention a fire · 11 report an injury · 19 say the car was towed.
2 complaints were filed in the last 12 months, the newest in May 2026.
Counts of what owners wrote in their complaints, not verified by anyone.
Recalls for the 2009 Mercedes-Benz C 300: 8
Various control units may have been updated with incorrect software configuration during a service repair. This can result in various system failures, such as loss of drive power, reduced exterior lighting, or loss of dynamic control functions, including stability and traction control. Various system failures, such as loss of drive power, reduced exterior lighting, or loss of dynamic control functions including stability and traction control, can increase the risk of a crash.
In the event of a crash necessitating deployment of the passenger frontal air bag, these passenger air bag inflator may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling. An inflator explosion may result in sharp metal fragments striking the driver or other occupants resulting in serious injury or death.
Various control units on these vehicles may have been updated with incorrect software, potentially affecting the correct deployment of the air bags in the event of a crash. 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.
These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. An inflator rupture may result in metal fragments striking the vehicle occupants resulting in serious injury or death.
These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. An inflator rupture may result in metal fragments striking the vehicle occupants resulting in serious injury or death.
Mercedes-Benz USA, LLC. Upon deployment of the driver's frontal air bag, excessive internal pressure may cause the inflator to rupture. In the event of a crash necessitating deployment of the driver's frontal air bag, the inflator could rupture with metal fragments striking the driver or other occupants resulting in serious injury or death.
Mercedes-Benz USA, LLC. Due to a manufacturing error, the air bag control unit may corrode and cause the control unit to malfunction. The malfunctioning air bag control unit may cause the air bags to unexpectedly deploy increasing the risk of injury and the possibility of a vehicle crash.
In the affected vehicles, a poor electrical ground connection may result in the dimming or failure of the tail lights. Dimming or failure of the tail lights reduces the ability to warn other motorists of the driver's intentions of stopping or turning, increasing the risk of a crash.
A recall may cover only some cars of a model year; the campaign size counts every model and year it lists. Enter your VIN at nhtsa.gov/recalls: dealers fix open recalls free.
Service bulletins from Mercedes-Benz: 88
Repair instructions Mercedes-Benz sent its dealers for symptoms seen in the shop on the 2009 Mercedes-Benz C 300. Ask a dealer or mechanic for a bulletin by its number.
Single throttle lift-off clunking noise from the side shaft when moving off (audible at the outboard end)
Harsh engagement when changing gear range from P to D or R
Check Engine Light is on with DTC P030185/ P030685 for misfire cylinder 1 and 6
The vehicle cannot be started The vehicle may start by itself shortly after the startup attempt with a delay…
NHTSA defect investigations: 3
Desiccated Air Bag Inflator Rupture
Loss of rear lighting assembly
Loss of rear tail light functionality
Neighbouring years
2008 C 300: 672 complaints, keep it · 2010 C 300: 453 complaints, keep it.
Every Mercedes-Benz C 300 year
2008 · 2009 · 2010 · 2011 · 2012 · 2013 · 2014 · 2015 · 2016 · 2017 · 2018 · 2019 · 2020 · 2021 · 2022 · 2023 · 2024 · 2025 · 2026 · All C 300 years side by side
Other Mercedes-Benz models: Mercedes-Benz AMG E 55 · Mercedes-Benz C 230 · Mercedes-Benz C 250 · Mercedes-Benz C 320 · Mercedes-Benz C 350 · Mercedes-Benz CLA 250 · Mercedes-Benz E 300 · Mercedes-Benz E 320 · Mercedes-Benz E 350 · Mercedes-Benz E 500 · Mercedes-Benz E 550 · Mercedes-Benz GL 450 · Mercedes-Benz GLA 250 · Mercedes-Benz GLC 300 · Mercedes-Benz GLE 350 · Mercedes-Benz GLK 350 · Mercedes-Benz ML 320 · Mercedes-Benz ML 350 · Mercedes-Benz Metris · Mercedes-Benz R 350 · Mercedes-Benz S 430 · Mercedes-Benz S 500 · Mercedes-Benz S 550 · Mercedes-Benz S Class · Mercedes-Benz SL 500 · Mercedes-Benz Sprinter 2500 · Mercedes-Benz Sprinter 3500. All makes and models.
Questions
Is the 2009 Mercedes-Benz C 300 a bad year?
575 owner complaints to NHTSA. Engine and transmission complaints are in line with other C 300 years. At 71,000 miles the tool says: Keep it.
What are the most common problems with the 2009 Mercedes-Benz C 300?
By owner complaints to NHTSA: electrical system (198), air bags (182), steering (136), exterior lighting (117), body structure (27).
How many recalls does the 2009 Mercedes-Benz C 300 have?
8 recall campaigns list this model year: Exterior lighting (NHTSA 22V-168), Air bags (NHTSA 18V-043), Electrical system (NHTSA 17V-177), Air bags (NHTSA 17V-017) and more. A recall may cover only some cars; check by VIN at nhtsa.gov/recalls.
Method: counts of unverified owner complaints filed with NHTSA, compared only with other years of the same model (sales volumes are unknown, so no failure rate is computed). A system stands out at 40+ complaints and at least twice the model's quiet (lower-quartile) year, or twice the share across every vehicle of that model year. The mileage range is the 25th to 75th percentile of the mileages owners reported. Data received by NHTSA through November 5, 2026. Repair prices are typical US ranges from named sources, not quotes. Not a diagnosis and not financial advice. PulsCar is not affiliated with NHTSA. Check this car at your own mileage.