2021 Mercedes-Benz C-Class
Problems, recalls and owner-reported issues
Engine is the leading concern among 15 owner complaints filed for this model year. This is the 23rd highest complaint count among 23 C-Class model years with reports.
What owners report most often
Recalls and investigations
No safety recalls on file.
Representative owner complaints: power train
2 reports, newest first. Show all
Suspension, Power train, Air bags, Dec 9, 2025
Driving and something came from underneath the vehicle and cause me to swerve in all the airbags deployed
Power train, Engine, Aug 6, 2025
My C300 only had about 42,000 miles and was less than 5 years old. Just after the factory warranty expired, the engine was running rough and hot, and "check engine" light illuminated. My local garage quickly diagnosed the problem as a failed cylinder head, stated that it is common with Mercedes 4-cylinder engines from about 2017, and said Mercedes may cover it since it is a "known problem" and shouldn't happen with that mileage. I was charged $7,860 by my local Mercedes dealer, and despite multiple contacts with MercedezUSA, they refuse to acknowledge this is a problem or cover the cost, although in on-line the forums some people were arbitrarily reimbursed. There should be a recall to check for this obvious defect and should be covered. This defect can cause sudden engine failure and is a significant hazard to the driving public.