repaired · 2025 Q4
Body: roof and pillars
Risk. A detached roof panel can become a road hazard, increasing the risk of a crash.
2017 Mercedes-Benz C300Problems, recalls & complaints
NHTSA has logged 216 owner complaints about the 2017 Mercedes-Benz C300, most often about the engine. It is covered by 15 safety recalls, and for recall 23V-854 the manufacturer reports only 41% of affected cars repaired.
Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through August 26, 2026. Updated daily. Photo: Vauxford, CC BY-SA 4.0.
Complaints by system
Where the 2017 Mercedes-Benz C300 has problems
216 complaints grouped by the system owners reported.
77Engine1 crash/fire/injury
31Electrical system3 crash/fire/injury
30Fuel/propulsion system
24Structure2 crash/fire/injury
21Seat belts2 crash/fire/injury
15Air bags
13Steering
12Power train
7Visibility
2110 other systems4 crash/fire/injury
| System | Complaints | Crash, fire or injury |
|---|---|---|
| Engine | 77 | 1 |
| Electrical system | 31 | 3 |
| Fuel/propulsion system | 30 | 0 |
| Structure | 24 | 2 |
| Seat belts | 21 | 2 |
| Air bags | 15 | 6 |
| Steering | 13 | 2 |
| Power train | 12 | 0 |
| Visibility | 7 | 1 |
| 10 other systems | 21 | 4 |
Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.
15 recalls
2017 Mercedes-Benz C300 recalls and how many were fixed
Each ring shows the share of affected cars repaired, from the manufacturer’s latest quarterly report to NHTSA. Recall repairs are free at authorized dealers.
repaired · 2026 Q2
Communication: auto crash notification
Risk. A disabled eCall system would prevent a vehicle occupant from contacting the emergency services call center in an emergency, potentially delaying emergency…
repaired · 2023 Q3
Body: roof and pillars
Risk. 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…
repaired · 2023 Q3
Communication
Risk. A disabled eCall system would prevent a vehicle occupant from contacting emergency services through the call center in an emergency, potentially delaying…
Show 11 more recalls
repaired · 2023 Q4
Communication: auto crash notification
Risk. Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
repaired · 2022 Q4
Front: retractor
Risk. If the seat belt does not fully retract, the occupant may find the operation of the seat belt inconvenient and not wear it, increasing the risk of injury in…
repaired · 2021 Q1
Communication
Risk. An inaccurate vehicle location may delay emergency responders, increasing the risk of injury.
repaired · 2020 Q4
Seats
Risk. If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
repaired · 2022 Q2
Rack and pinion: rack
Risk. A car that cannot be properly steered has an increased risk of a crash.
repaired · 2019 Q4
Structure: body
Risk. If the beltline trim were to separate from the vehicle while driving, it could become a road hazard, increasing the risk of a crash.
repaired · 2019 Q3
Seats
Risk. If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
repaired · 2019 Q4
Air bags: frontal
Risk. If the driver air bag inadvertently deploys, it can increase the risk of injury and a crash.
repaired · 2019 Q1
Seat belts: pretensioner
Risk. If the front seat seatbelt pretensioners do not function properly, the seat occupants may not be adequately restrained in the event of a crash, increasing the…
repaired · 2018 Q3
Steering: electric power assist system
Risk. A loss of electrical contact will cause the electric power steering assist to deactivate, increasing the risk of a crash.
repaired · 2018 Q4
Electrical system: starter assembly
Risk. If the starting current limiter overheats, the surrounding components can melt, increasing the risk of a fire.
Recalls apply to specific cars. To see whether a recall is still open on yours, enter the 17-character VIN at nhtsa.gov/recalls or with Mercedes-Benz.
Owner-reported costs
What owners say repairs cost
Dollar amounts owners wrote in their complaints when describing a repair or a quote. These are not price estimates; a system is shown only when at least 8 owners mentioned a cost.
Engine
9 owners mentioned a cost$2,000median
Middle half: $1,775 – $2,500
If a problem is covered by a recall, the dealer fixes it for free. Some manufacturers also reimburse owners who paid for a repair before a recall was announced.
Best & worst years
2017 vs. every other C300 year
Bars show complaints per model year. Colors show the CarFlaw verdict: complaints weighted for crashes, fires and injuries, adjusted for years on the road and compared with the C300 median. How we score
'08'09'10'11'12'13'14'15'16'17'18'19'20'21'22'23'24'25'26
- Avoid
- Caution
- Solid
- Best
- Not rated
2 investigations
NHTSA defect investigations
Federal investigations that included the 2017 Mercedes-Benz C300, and the recalls they led to.
- Desiccated Air Bag Inflator RuptureOpen
- Front Roof Panel DetachmentLed to recall 21V-197
In owners' words
What C300 owners report
Recent engine complaints filed with NHTSA, shortened. Personal details are removed.
2017 Mercedes c300 the switchover valve in the diagnostic module of the evaporative emission control system is jammed open. This issue was called for recall for models 2018 or later, but 2017 was not part of it.
The contact owns a 2017 Mercedes-Benz C300. While driving at approximately 15 mph, the contact observed smoke emanating from under the hood. The vehicle was driven to her work location and parked. Upon exiting the vehicle and opening the hood, she observed orange flames coming from the engine…
Check engine light for P052E which has been coming and going off for years now. Now the check engine light is there permanently. I spoke to Mercedes Benz customer service and requested for them to fix the problem now that the light is on permanently but they refuse to fix it because the car has…
Own a 2017 C300?
Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.