MERCEDES-BENZ C 300 4MATIC · model year

2018 MERCEDES-BENZ C 300 4MATIC

7 NHTSA complaints for this specific cohort.

NHTSA overall rating

Not crash-tested

New Car Assessment Program

The 2018MERCEDES-BENZC 300 4MATIC carries 7 consumer safety complaints in NHTSA's Office of Defects Investigation database for this specific model-year cohort. Within that volume, owners reported 0 crashes, 0 fires, 0 injuries, and 0 fatalities. No NCAP 5-star crash-test rating is available for this model year in the federal database.

Component-level analysis is where model-year complaints become actionable: the top complaint category for the 2018 C 300 4MATIC is engine with 2 filings, followed by air bags (1) and electrical system (1). Concentration in one or two component groups is the classic signature of a systemic defect; a flat distribution usually reflects normal aging, warranty complaints, or isolated build-plant variability.

NHTSA currently has 15 investigation files overlapping the 2018 C 300 4MATIC. Owners comparing this cohort against neighboring years should pair the counters above with the complaint-by-year trend on the parent model page — a spike in a single year often tracks to a platform refresh, a new transmission supplier, or an updated ECU calibration. Use the related-complaint feed below to read raw owner narratives before deciding whether any pattern here affects your specific use case.

7
Complaints
0
Crashes
0
Fires
0
Injuries
0
Deaths

Total Complaints

7 filings

Crashes Reported

0 reports

Source

NHTSA ODI

Federal complaints database

Complaints vs. fleet median (215)

At or below the fleet median complaint volume.

Complaints by Component

ComponentCount
ENGINE2
AIR BAGS1
ELECTRICAL SYSTEM1
COMMUNICATION1
STEERING1
SEAT BELTS1

Recent Complaints

20250123SEAT BELTS

The contact owns a 2018 Mercedes-Benz C300 4Matic. The contact stated that the front passenger's and driver's side seat belts had failed to retract and return to the stowed position. The contact related the failure to NHTSA Campaign Number: 21V032000 (Seat Belts); however, the VIN was not included. The dealer was notified of the failure and informed the contact that there would be a cost for a diagnostic test. The vehicle was not diagnosed or repaired. The manufacturer was notified of the failure, but no assistance was provided. The failure mileage was approximately 59,000.

Mileage: 59,000

20240909STEERING

car has less than 34,000 miles on it. One day went to drive and the vehicle wouldn't turn and an error message popped up "power steering malfunction, check owners manual" Had it towed to dealer and they said they couldn't find anything wrong with it. According to the dealer, no sign of wear and tear, no physical damage,

20240423ENGINE

Very common problem on all Mercedes - code P052E - second time on this car. Engine light, 2nd time on this car. Car is 2018 and has 45k miles. First time it was at 28037 miles. This is a MAJOR issue costing consumers $1500-$2500 to repair and needs a recall from manufacturer

20230124ENGINE

2018 Mercedes C300. P052E check engine code. Positive Crankcase Ventilation failed with less than 28K miles. Common reported problem but not covered after warranty period, even with extended warranty addition. It's a major part of the engine function and 6 hours of labor to replace. Mercedes Benz should cover this type of fault on the design.

20210527ELECTRICAL SYSTEM

The contact owns a 2018 Mercedes-Benz C300 4matic. The contact received notification of NHTSA Campaign Number: 21V058000 (Communication, Electrical System) however, the part to do the recall repair was not yet available. The local dealer was contacted and stated that the equipment needed to perform the repair was not available. The manufacturer was contacted and informed the contact that the repair was an over-the-air software update. The vehicle was not yet repaired, nor was there any way to confirm that the software update was completed. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that the START/STOP feature failed to perform as designed. The rear windows failed to raise and lower as needed. The contact took the vehicle to the dealer to be repaired. The exact repairs were unknown. The approximate failure mileage was 49,000.

Mileage: 49,000

20210527COMMUNICATION

The contact owns a 2018 Mercedes-Benz C300 4matic. The contact received notification of NHTSA Campaign Number: 21V058000 (Communication, Electrical System) however, the part to do the recall repair was not yet available. The local dealer was contacted and stated that the equipment needed to perform the repair was not available. The manufacturer was contacted and informed the contact that the repair was an over-the-air software update. The vehicle was not yet repaired, nor was there any way to confirm that the software update was completed. The contact stated that the manufacturer had exceeded a reasonable amount of time for the recall repair. The contact stated that the START/STOP feature failed to perform as designed. The rear windows failed to raise and lower as needed. The contact took the vehicle to the dealer to be repaired. The exact repairs were unknown. The approximate failure mileage was 49,000.

Mileage: 49,000

20181212AIR BAGS

APPARENTLY THERE IS A RECALL SITUATION THAT INCLUDES MY VEHICLE AND MERCEDES BENZ WASN'T ABLE TO SOLVE IT YET. I BOUGHT THE CAR AFTER THE RECALL HAS BEGAN.

Compare 2018MERCEDES-BENZC 300 4MATIC to Similar Vehicles

NHTSA Investigations

View all investigations

Frequently Asked Questions

How many complaints does the 2018 MERCEDES-BENZ C 300 4MATIC have?
The 2018 MERCEDES-BENZ C 300 4MATIC has 7 NHTSA complaints, 0 crashes, 0 fires, 0 injuries, and 0 deaths reported.
What are the most common problems with the 2018 MERCEDES-BENZ C 300 4MATIC?
The most-complained component for the 2018 MERCEDES-BENZ C 300 4MATIC is ENGINE with 2 complaints. Other frequently reported areas include AIR BAGS and ELECTRICAL SYSTEM.
Is the 2018 MERCEDES-BENZ C 300 4MATIC safe to buy?
Review the complaint history, crash and fire reports, safety ratings, and recall status on this page to make an informed decision. No NHTSA crash test rating is available for this model year. Compare with other model years using the links above.
Where does this data come from?
All complaint, recall, and safety rating data is sourced from the National Highway Traffic Safety Administration (NHTSA). Complaints are filed by vehicle owners through NHTSA's Office of Defects Investigation.

Vehicle Safety Guides

Data as of 2025. Sources: NHTSA Office of Defects Investigation (ODI) complaints database, NHTSA recall campaign API, NHTSA NCAP crash-test ratings, and NHTSA FARS for fatality cross-reference.