AutoUtility currently tracks 8 official NHTSA owner defect complaints for the 2021 Mercedes-Benz GLC. Engine & Cooling issues are the most frequently reported category, appearing in 3 complaints (37.5% of submitted records). Zero crashes, fires, injury reports, or fatality reports are cited across these complaint records. The 2021 Mercedes-Benz GLC belongs to the 1st Generation (X253/C253) platform.
- • Total NHTSA Complaints: 8 reports
- • #1 Reported Problem Area: Engine & Cooling (3 reports • 37.5% of submitted complaints)
- • Secondary Problem Areas: Electrical System (2), Powertrain & Transmission (2)
- • Crash-Citing Complaints: 0 filings
- • Fire-Citing Complaints: 0 filings
- • Complaints Reporting Injuries / Fatalities: 0 injury filings • 0 fatality filings
Most Reported Problems for 2021 Mercedes-Benz GLC
Top automotive subsystem defect categories ranked by unique owner complaint volume in federal records
Engine & Cooling
Electrical System
NHTSA records list 2 official safety recall campaigns for this model year involving the same broad component area:
- Campaign #22V365000 ELECTRICAL SYSTEM:SOFTWARE
- Campaign #21V058000 ELECTRICAL SYSTEM:SOFTWARE
Powertrain & Transmission
Exterior Lighting
NHTSA records list 2 official safety recall campaigns for this model year involving the same broad component area:
- Campaign #22V261000 EXTERIOR LIGHTING:HEADLIGHTS
- Campaign #24V070000 EXTERIOR LIGHTING:HEADLIGHTS
Wheels & Tires
Recent NHTSA Owner Reports for 2021 Mercedes-Benz GLC
Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation
"Moisture began collecting inside the left headlight assembly, even though the housing should be sealed. Over time, the condensation increased and the front left turn signal failed. The vehicle displayed warning messages for the turn signal, low beams, Blind Spot Assist, Traffic Sign Assist, and..."
"The engine-driven vacuum pump and turbocharger boost-control vacuum system malfunctioned. The vehicle developed insufficient vacuum to the boost-control system, resulting in a P0299 turbocharger underboost fault and reduced engine power. The vehicle is available for inspection upon request. The..."
"At just 30,000 miles — less than half the mileage at which these failures are typically reported — my GLC 43 was found to have active oil leaks in multiple locations: 1. Front engine covers — oil is seeping from both the front cover gasket area and migrating downward along the engine block. The..."
"This 2021 Mercedes-Benz GLC 63 AMG has experienced repeated and escalating warranty defects involving engine performance, loss of acceleration, air suspension failure, and now inoperative advanced safety systems including blind spot and active brake assist. Despite numerous repair attempts at..."
"The contact owns a 2021 Mercedes-Benz AMG GLC63. The vehicle was taken to the local dealer for routine maintenance, and the contact was informed that there was an issue with the ignition coil. There was a misfire coming from the engine. The dealer determined that the ignition coil needed to be..."
Complaint History for Mercedes-Benz GLC
Reported defect complaint volume across sibling model years (2016–2026)
| Model Year | NHTSA Complaints | Crash Reports | Safety Recalls | Detailed Report |
|---|---|---|---|---|
| 2016 Mercedes-Benz GLC | 139 | 10 | 12 | View 2016 Problems → |
| 2017 Mercedes-Benz GLC | 115 | 5 | 12 | View 2017 Problems → |
| 2018 Mercedes-Benz GLC | 99 | 5 | 14 | View 2018 Problems → |
| 2019 Mercedes-Benz GLC | 68 | 5 | 14 | View 2019 Problems → |
| 2020 Mercedes-Benz GLC | 78 | 3 | 18 | View 2020 Problems → |
| 2021 Mercedes-Benz GLC Current Page | 8 | 0 | 9 | Current |
| 2022 Mercedes-Benz GLC | 62 | 5 | 2 | View 2022 Problems → |
| 2023 Mercedes-Benz GLC | 65 | 2 | 12 | View 2023 Problems → |
| 2024 Mercedes-Benz GLC | 0 | 0 | 8 | View 2024 Problems → |
| 2025 Mercedes-Benz GLC | 17 | 4 | 3 | View 2025 Problems → |
| 2026 Mercedes-Benz GLC | 0 | 0 | 3 | View 2026 Problems → |
Detailed NHTSA Component Breakdown for 2021 Mercedes-Benz GLC
Complete distribution of consumer defect reports across all 7 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Reported Injury Entries | Reported Fatality Entries |
|---|---|---|---|---|---|
| Electrical System NHTSA category: ELECTRICAL SYSTEM | 2 | 0 | 0 | 0 | 0 |
| Engine NHTSA category: ENGINE | 1 | 0 | 0 | 0 | 0 |
| EXTERIOR LIGHTING | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,ENGINE | 1 | 0 | 0 | 0 | 0 |
| SUSPENSION,POWER TRAIN,ENGINE | 1 | 0 | 0 | 0 | 0 |
| Tires NHTSA category: TIRES | 1 | 0 | 0 | 0 | 0 |
| Other / Uncategorized NHTSA category: UNKNOWN OR OTHER | 1 | 0 | 0 | 0 | 0 |
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.