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Electrical systemPart report

2018 Mercedes-Benz C300 Electrical system Problems

Complaints
10about this part
Share
10%of 99 total for the year
Median mileage
52,800miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 10 complaints about the electrical system of the 2018 Mercedes-Benz C300, 10% of the 99 complaints for this model year. Where a mileage was given, the median is 52,800 miles. 1 of these say a crash was involved, according to the filers. 2 recall campaigns on record are filed under a similar system.

Fewer than 15 complaints name this part, so treat the figures as a rough indication only.

Example complaints

Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.

“The sunroof on the vehicle jams and either stays partially open or won’t close in the rear completely. I finally got it to close but it will not open again. I know multiple mercedes owners who have this issue with the sunroof and if the sunroof will continue to not lock properly this could be a hazard on the highway if the brackets were to break and the glass slides off.”

NHTSA complaint #11446466, filed 2022-01

“Hello My c300 2018 only have 79k and suddenly the engine light on, when I check it show that I need Positive Crankcase ventilation valve replace. it cost $2300. As I know a lot of people who own Merced have the same problem so should have a recall for that Thanks”

NHTSA complaint #11540537, filed 2023-08

“To Whom It May Concern, I bought this certified preowned Mercedes Benz, and the recall is open. I have taken the car to the dealership, they deny me from service because its an over the air recall. The Mercedes Benz website clearly states on their letter for consumer that the remedy for this recall can be taken care at the dealership free of charge or an over the air update. Its July and I got the car back in February.”

NHTSA complaint #11423935, filed 2021-07

“According to the dealership, if the car is not started every 3 days, it will shut itself down. The car was towed 6 times, I'm a business woman, my coworkers, friends drives Mercedes Benz, and no one have heard of any such issues. Any cheaper cars, after 2 weeks at the airport, the car starts. Something is wrong with the car, something is draining the car battery if not started every 3/ 4 days. They are taking advantage to the fact, that I'm a female and older. They need to replace the car, fix, or junk their car. Someone needs to take responsibility for the repair of the car.”

NHTSA complaint #11543013, filed 2023-09

“The contact owns a 2018 Mercedes-Benz C300. The contact stated that while driving at an undisclosed speed, there was a message was displayed that there was a light bulb malfunction. The contact stated that the rear turn signal lights and brake lights were not operating properly. Additionally, the contact stated that the fuel door failed to operate properly, and occasionally opened independently while driving. The vehicle was taken to a local dealer, where it was diagnosed and determined that the cause of the electrical issues was water in the spare tire compartment. …”

NHTSA complaint #11564953, filed 2024-01, 52,800 miles

Related recalls

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
2024436%
2023523%
2022728%
202117%
202039%
20191319%
20181010%
20173114%
20163211%
20155013%
2014910%
2013197%
2012124%
2011439%
20108419%
200919834%
200822834%

Other parts of the 2018 Mercedes-Benz C300

Engine
34 complaintsOther or unknown
23 complaintsBody and structure
14 complaintsSteering
12 complaintsFuel system
10 complaintsAir bags
4 complaintsForward collision avoidance
4 complaintsVisibility (wipers, defrost, mirrors)
3 complaintsBrakes
2 complaintsExterior lighting
2 complaintsTires
2 complaintsTransmission and drivetrain
2 complaints

← All problems reported for the 2018 Mercedes-Benz C300

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 31, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology