2021 Mercedes-Benz C 300 4matic problems

The worst 2021 Mercedes-Benz C 300 4matic problems

Ranked by number of owner complaints. Mileage and cost come from what owners wrote.

• Airbags
  1
• Suspension
  1
• Transmission
  1

Problems by type

Tap a problem to see which part fails, at what mileage and in which other years.

• Airbags
  1
• Suspension
  1
• Transmission
  1

Recalls

No recalls on record for this model year.

Technical service bulletins for the 2021 Mercedes-Benz C 300 4matic 49

Bulletins tell dealers how to fix known problems. A warranty extension means the manufacturer pays for that repair for longer.

• Aug 15, 2026 Warranty extensionDear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz...
• Jul 31, 2026 Warranty extensionFuel/propulsion system
• Jan 10, 2026 Warranty extensionIn our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the...
• Sep 26, 2026 Service bulletinCustomer complaints relating to automatic transmission 725.0 (NAG3 Classic /9G‑TRONIC automatic...
• Sep 26, 2026 Service bulletinSlight creaking noises when steering
• Sep 25, 2026 Service bulletinCEL illuminates and/or AC does not blow cold
• Sep 22, 2026 Service bulletinRepeat workshop visit for vehicle vibration while braking from 60MPH. NOTE: Although the symptom is...
• Sep 14, 2026 Service bulletinOnly vehicles with a variable transfer case are affected
• Sep 14, 2026 Service bulletinClanking noise from the area of the speakers in the doors
• Sep 4, 2026 Service bulletinCustomer complaints relating to automatic transmission 725.0 (NAG3 Classic / 9G‑TRONIC automatic...

See all 49 bulletins for the 2021 Mercedes-Benz C 300 4matic

What 2021 Mercedes-Benz C 300 4matic owners say

Most recent owner complaints, unedited.

Compare the 2021 Mercedes-Benz C 300 4matic

Other model years

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