2017 Mercedes-Benz C300 Seat belts Problems
- Complaints
- 21about this part
- Share
- 10%of 216 total for the year
- Median mileage
- 20,000miles
- Trend
- RisingComplaints filed in the last 3 full calendar years are at least 25% higher than in the 3 years before.
NHTSA recorded 21 complaints about the seat belts of the 2017 Mercedes-Benz C300, 10% of the 216 complaints for this model year. Where a mileage was given, the median is 20,000 miles. 2 of these say a crash was involved, according to the filers. 2 recall campaigns on record are filed under a similar system.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“I hit a bear in montana in my 2017 mercedes C300 at 86mph and destroyed the front of my car. The seatbelts deployed and wrenched us into our seats and smoke came out of the front air vents but the airbags did not go off. On the dash the vehicles stated that the airbags in all 4 zones in the car malfunctioned and service is required. Mercedes is stating that the light is from a seatbelt error code but the dash did not say anything about srs or seatbelts. I do not want to put my family back in the car and do not feel it should be repaired. …”
NHTSA complaint #11112163, filed 2018-07, 17,000 miles“Rear driver side seat belt not locking and can not depress unlocking button. Doesn't lock before starting nor after car is started and driving. Just purchased car 4 months ago back seat never used.”
NHTSA complaint #11386566, filed 2021-01, 22,000 miles“2017 Mercedes-Benz C300 coupe. Seatbelt pre-tensioner , part of mercedes' pre-safe feature that tightens the seatbelt to remove slack when you click the seatbelt in, doesn't always work.”
NHTSA complaint #11030383, filed 2017-09, 100 miles“For the past several weeks the seat belt warning light goes on and the chime sounds intermittently while I am driving with the driver seat belt engaged. Also; while this is happening, the seat belt pretensioner repeatedly deactivates and activates. The vehicle is available for inspection at my home in Pleasant View, Utah. Can my safety be compromised if the pretensioner is not activated? Will the driver air bag function if it thinks the seat is empty? The Mercedes Dealer was no help; all the Customer Service person could tell me was there was not a Recall on my vehicle. …”
NHTSA complaint #11426152, filed 2021-07“The contact owns a 2017 Mercedes-Benz C300. The contact had received notification of NHTSA Campaign Number: 21V032000 (Seat Belts). The vehicle was taken to a local dealer and the recall repair was performed; however, upon retrieving the vehicle, the check engine warning light illuminated upon starting the vehicle. The vehicle was taken back to the dealer and remained in the dealer possession. The manufacturer was not notified of the failure. The vehicle was not repaired. The failure mileage was approximately 34,000.”
NHTSA complaint #11575740, filed 2024-03, 34,000 milesRelated recalls
- 21V032000Jan 29, 2021Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2021 C300, 2017-2020 AMG C43, and AMG C63 vehicles. The front seat belts might not fully retract to…Covers: Mercedes-Benz C300 2017–2021, AMG C43 2017–2020, AMG C63 2017–2020
- 17V251000Apr 11, 2017Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017 C300, C300 4Matic, C300 Coupe, C300 Coupe 4Matic, C43 AMG, C43 AMG Coupe, C43 AMG Cabrio, C63 AMG…Covers: Mercedes-Benz C300 2017, GLC 300 2017, S550 2017 +8 more
Related service bulletins
- 10151959Jul 23, 2018Seat belt extender toothed rack sluggish or makes noises
Seat belts: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2022 | 1 | 4% |
| 2019 | 5 | 7% |
| 2018 | 1 | 1% |
| 2017 | 21 | 10% |
| 2016 | 1 | 0% |
| 2015 | 2 | 1% |
| 2013 | 1 | 0% |
| 2012 | 1 | 0% |
| 2011 | 2 | 0% |
| 2010 | 5 | 1% |
| 2009 | 8 | 1% |
| 2008 | 22 | 3% |
Other parts of the 2017 Mercedes-Benz C300
77 complaintsOther or unknown
36 complaintsFuel system
33 complaintsElectrical system
31 complaintsBody and structure
24 complaintsAir bags
15 complaintsSteering
13 complaintsTransmission and drivetrain
12 complaintsVisibility (wipers, defrost, mirrors)
9 complaintsForward collision avoidance
3 complaintsBrakes
2 complaintsEngine cooling
2 complaints
← All problems reported for the 2017 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