Mercedes-Benz GLC 300
2021 only
2021 Mercedes-Benz GLC 300 have 86 classified complaints on record for that year specifically, plus 9 recalls. The most common issue in this year is Head gasket and cylinder head, typically surfacing around 35,000 miles.
Computed directly from stored federal records for 2021 model years only — not blended with the rest of this vehicle's production run. See the full Mercedes-Benz GLC 300 report for every year combined.
Where this year fits
What breaks, and when — 2021 only
Median onset: 35,000 miles.
More common in older model years. · Typical repair: $1,620–$3,010 nationally.
Median onset: 28,000 miles.
More common in older model years. · Typical repair: $630–$1,700 nationally.
Median onset: 92,700 miles.
Tends to show up later than this model's other issues. · More common in newer model years.
Median onset: 96,000 miles.
Tends to show up later than this model's other issues. · More common in newer model years.
Median onset: 90 miles.
Tends to show up earlier than this model's other issues. · More common in older model years.
Median onset: 10 miles.
Tends to show up earlier than this model's other issues.
Onset mileage not consistently reported.
Onset mileage not consistently reported.
More common in older model years.
From owner-filed complaints to NHTSA, not independently verified. Federal mileage reporting on recent complaints is sparse — see how it works. Cost ranges are national estimates from book labor hours and parts pricing, not this vehicle's actual repair history — they don't account for your location or shop type.
Cost estimator: what will this one cost you?
Enter the car's year and mileage. See which known problems are due in your next 3 years, what each costs at your state's labor rates, which ones to ask the seller about, and routine maintenance to budget for.
Sources: NHTSA Office of Defects Investigation — complaints and recalls, scoped to 2021 model year. See the full Mercedes-Benz GLC 300 report for every year and full specs/safety data.