AutoUtility currently tracks 16 official NHTSA owner defect complaints for the 2021 Mercedes-Benz C-Class. Engine & Cooling issues are the most frequently reported category, appearing in 8 complaints (50% of submitted records). Zero crashes, fires, injury reports, or fatality reports are cited across these complaint records. The 2021 Mercedes-Benz C-Class belongs to the 4th Generation (W205) platform.
Factual proportion of owner complaints categorized by automotive subsystem in NHTSA records
8 owner complaints submitted to NHTSA ODI for this subsystem.
3 owner complaints submitted to NHTSA ODI for this subsystem.
2 owner complaints submitted to NHTSA ODI for this subsystem.
2 owner complaints submitted to NHTSA ODI for this subsystem.
Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation
"The contact owns a 2021 Mercedes-Benz C 300. The contact stated that while depressing the accelerator pedal, there was a loud knocking sound coming from the engine compartment while accelerating. There were no warning lights illuminated. The vehicle was taken to the dealer to be diagnosed, and it..."
"The contact owns a 2021 Mercedes Benz C. The contact stated that while driving on the highway, the vehicle began to lose power, riding rough. The check engine light illuminated. The vehicle was towed to the dealer where it was diagnosed with a fuel injection failure. The vehicle read diagnostic..."
"I am reporting a safety defect involving the panoramic sunroof on my 2021Mercedes-Benz Coop vehicle. The panoramic sunroof has malfunctioned due to an apparent design or manufacturing defect. The sunroof fails to open / close and makes grinding or popping noises which malfunctioned unexpectedly...."
"The contact owns a 2021 Mercedes-Benz C300. The contact stated that while driving at an undisclosed speed, the vehicle stalled and failed to exceed 30 MPH, with the check engine warning light illuminated. The vehicle did not require a restart. The contact also stated that while stopped at a traffic..."
"Driving and something came from underneath the vehicle and cause me to swerve in all the airbags deployed"
Reported defect complaint volume across sibling model years (2015–2026)
| Model Year | NHTSA Complaints | Crash Reports | Safety Recalls | Detailed Report |
|---|---|---|---|---|
| 2015 Mercedes-Benz C-Class | 441 | 11 | 14 | View 2015 Problems → |
| 2016 Mercedes-Benz C-Class | 315 | 7 | 14 | View 2016 Problems → |
| 2017 Mercedes-Benz C-Class | 253 | 12 | 17 | View 2017 Problems → |
| 2018 Mercedes-Benz C-Class | 0 | 0 | 19 | View 2018 Problems → |
| 2019 Mercedes-Benz C-Class | 75 | 3 | 16 | View 2019 Problems → |
| 2020 Mercedes-Benz C-Class | 46 | 5 | 12 | View 2020 Problems → |
| 2021 Mercedes-Benz C-Class Current Page | 16 | 0 | 7 | Current |
| 2022 Mercedes-Benz C-Class | 26 | 1 | 9 | View 2022 Problems → |
| 2023 Mercedes-Benz C-Class | 25 | 2 | 10 | View 2023 Problems → |
| 2024 Mercedes-Benz C-Class | 15 | 2 | 3 | View 2024 Problems → |
| 2025 Mercedes-Benz C-Class | 4 | 0 | 2 | View 2025 Problems → |
| 2026 Mercedes-Benz C-Class | 0 | 0 | 1 | View 2026 Problems → |
Complete distribution of consumer defect reports across all 10 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Injury Entries | Fatality Entries |
|---|---|---|---|---|---|
| Engine NHTSA category: ENGINE | 6 | 0 | 0 | 0 | 0 |
| Fuel & Propulsion System NHTSA category: FUEL/PROPULSION SYSTEM | 2 | 0 | 0 | 0 | 0 |
| Air Bags NHTSA category: AIR BAGS | 1 | 0 | 0 | 0 | 0 |
| Back Over Prevention / Camera NHTSA category: BACK OVER PREVENTION | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,ENGINE | 1 | 0 | 0 | 0 | 0 |
| Fuel System NHTSA category: FUEL SYSTEM, GASOLINE | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,ENGINE | 1 | 0 | 0 | 0 | 0 |
| SUSPENSION,POWER TRAIN,AIR BAGS | 1 | 0 | 0 | 0 | 0 |
| Tires NHTSA category: TIRES | 1 | 0 | 0 | 0 | 0 |
| Visibility / Glass NHTSA category: VISIBILITY | 1 | 0 | 0 | 0 | 0 |
Cross-reference safety recalls, crash test safety ratings, and EPA fuel economy for this model year
Key performance indicators, EPA fuel economy specs, powertrain variants, and summary ratings.
Official recall campaigns, safety defect descriptions, and manufacturer free remedy instructions.
NHTSA 5-Star NCAP crash test results, driver assistance systems, and rollover resistance ratings.
EPA fuel economy ratings, electric range, and annual energy cost benchmarks.
Direct, deterministic answers synthesized from verified United States government databases for the 2021 Mercedes-Benz C-Class
In official NHTSA consumer records, the most frequently cited issue area for the 2021 Mercedes-Benz C-Class is Engine & Cooling, appearing in 8 records (50% of submitted filings).
Secondary reported categories include Fuel & Propulsion System (3) and Air Bags & Restraints (2).
AutoUtility does not issue subjective reliability scores or commercial ratings. In official United States government records, NHTSA tracks 16 consumer defect complaints and 7 safety recall campaigns for the 2021 Mercedes-Benz C-Class.
Reviewing documented component complaint distributions, recall remedy notices, and active federal investigations provides an objective, evidence-based view of the vehicle's historical safety and defect record.
Consumer complaint records on file with NHTSA for the 2021 Mercedes-Benz C-Class cite zero crashes, zero fires, and zero injuries.
Incident entries represent consumer descriptions at the time of submission to federal authorities and do not establish mechanical causation or legal liability.
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database under 49 CFR Part 576.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.