Is the 2015 Mercedes-Benz C 300 a bad year?
382 owner complaints to NHTSA. Engine complaints: 128, 13× a quiet C 300 year.
Keep it, but watch the engine
Half of the engine complaints for this year were filed at 30k–70k miles, where you are now. Few of them say the car was towed: 7 of 126 filed since 2016.
The verdict moves with mileage: the same car reads differently at 30,000 and at 150,000 miles.
What 2015 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 53,000 miles.
| SYSTEM | COMPLAINTS | MIDDLE HALF FILED AT | TYPICAL US REPAIR BILLS |
|---|---|---|---|
| EngineSTANDS OUT | 127 (33%) | 37k–70k miles · around this mileage | Valve cover gasket replacement $110–$500 · Timing chain replacement $1,000–$4,000 |
| Fuel systemSTANDS OUT | 70 (18%) | 32k–60k miles · around this mileage | Fuel pump replacement $220–$1,500 · Fuel injector replacement (one injector) $300–$1,200 |
| Body structureSTANDS OUT | 61 (16%) | 51k–91k miles · around this mileage | — |
| Steering | 23 (6%) | 22k–74k miles · around this mileage | Steering rack and pinion replacement $700–$2,100 |
| Visibility and wipers | 16 (4%) | 27k–65k miles · around this mileage | — |
| Electrical system | 50 (13%) | 8k–39k miles · mostly behind | — |
| Suspension | 22 (6%) | too few with a mileage | — |
| Transmission and drivetrain | 20 (5%) | too few with a mileage | — |
| Air bags | 12 (3%) | too few with a mileage | — |
| Brakes | 9 (2%) | too few with a mileage | — |
| Collision avoidance | 8 (2%) | too few with a mileage | — |
| Wheels | 8 (2%) | too few with a mileage | — |
| Stability control | 7 (2%) | too few with a mileage | — |
| Speed control | 5 (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 53,000 miles. Not a quote.
What owners reported alongside their complaints
Of 382 complaints: 9 mention a crash · 1 mentions a fire · 4 report an injury · 23 say the car was towed.
13 complaints were filed in the last 12 months, the newest in Oct 2026.
Counts of what owners wrote in their complaints, not verified by anyone.
In owners' own words
Engine broke a piston at 53,000 miles in normal use. Causing major rupture on engine.
While the vehicle in motion, hearing a loud sounds coming from the engine. At first it's sounded like a rock in a tin can, later it was a slapping sound.
While I was driving on the highway & local roads, the car suddenly became unresponsive and started showing messages that all systems are inoperative.
Unedited excerpts from complaints filed with NHTSA, chosen by mileage (nearest 53,000 miles), not by content. Unverified.
Recalls for the 2015 Mercedes-Benz C 300: 11
The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair, allowing the front panel to detach from the vehicle. A detached roof panel can become a road hazard, increasing the risk of a crash.
The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair. The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detach from the vehicle and become a road hazard, increasing the risk of a crash.
Mercedes-Benz USA, LLC. For a full list of the affected models visit: https://static.nhtsa.gov/odi/rcl/2019/RMISC-19V787-4620.pdf An inaccurate vehicle location may delay emergency responders, increasing the risk of injury.
A locknut in the steering rack may break under high load, possibly causing the steering to become stuck in one position. A car that cannot be properly steered has an increased risk of a crash.
Mercedes-Benz USA, LLC. The driver's air bag may unexpectedly deploy due to insufficient grounding of the steering components if an electrostatic discharge occurs and the air bag clockspring is broken. If the driver air bag inadvertently deploys, it can increase the risk of injury and a crash.
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.
Mercedes-Benz USA, LLC. In the event that the engine or transmission cannot turn over, the starting current limiter may overheat from the repeated attempts of the starter motor attempting to start the vehicle. If the starting current limiter overheats, the surrounding components can melt, increasing the risk of a fire.
Due to an error in the electric power steering control unit software, the affected vehicles may have a loss of electric power steering assist. If the vehicle experiences a loss of power steering assist, extra steering effort will be required, especially at lower speeds, increasing the risk of a vehicle crash.
Mercedes-Benz USA, LLC. In the affected vehicles, the fuel delivery module may be improperly secured to the fuel tank. Secondly, electrical wires that connect to the fuel delivery module might have been pinched between the flange of the fuel delivery module and the tank. If the locking plate is not properly secured to the fuel delivery module it may become loose, and leak fuel, increasing the risk of a fire.
The affected vehicles were assembled with horizontal adjustment mechanisms that allow the owner to change the horizontal adjustment used during the manufacturing process, instead of the proper sealing caps. If the original horizontal adjustment is used to alter the low beam aim, the misaimed headlamp may not properly illuminated the road or cause increased glare to oncoming drivers, which increases the risk of a crash.
If the steering coupling interlock mechanism is not locked in place, the sliding shaft, which is part of the steering column, could become disengaged from the steering coupling socket due to vibrations, steering thrust, or load feedback from the road surface. If the sliding shaft becomes disengaged from the steering coupling socket, the driver may experience noises, steering backlash, and in a worst case, loss of steering control, which may increase 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: 102
Repair instructions Mercedes-Benz sent its dealers for symptoms seen in the shop on the 2015 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)
Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed…
Check engine light illuminated Fault code stored in N3/10 control unit- P052E71 Positive Crankcase Ventilation Regulator Valve Performance: The valve…
Tension-releasing impact of the propeller shaft with the force-free in D "KID" function, after vehicle has stopped
NHTSA defect investigations: 3
C300 Wrist-pin allegation
Desiccated Air Bag Inflator Rupture
Front Roof Panel Detachment
Neighbouring years
2014 C 300: 94 complaints, keep it · 2016 C 300: 291 complaints, keep it, but watch the engine.
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 2015 Mercedes-Benz C 300 a bad year?
382 owner complaints to NHTSA. Engine complaints: 128, 13× a quiet C 300 year. At 53,000 miles the tool says: Keep it, but watch the engine. Half of the engine complaints for this year were filed at 30k–70k miles, where you are now. Few of them say the car was towed: 7 of 126 filed since 2016.
What are the most common problems with the 2015 Mercedes-Benz C 300?
By owner complaints to NHTSA: engine (127), fuel system (70), body structure (61), steering (23), visibility and wipers (16). Half of the engine complaints were filed between 30k–70k miles.
How many recalls does the 2015 Mercedes-Benz C 300 have?
11 recall campaigns list this model year: Body structure (NHTSA 23V-854), Body structure (NHTSA 21V-197), Communication (NHTSA 19V-787), Steering (NHTSA 18V-850) 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.