Car Defect Radar
Get the report
Built from NHTSA complaints and recalls collected for this model, generated October 26, 2026. Totals reflect what has been collected, not every complaint ever filed.
Confirm 3 recalls before you buy.

Ask the seller for proof the repair was completed, or run the free VIN check. Recall repairs are done at no cost by a dealer.

Recalls

5 total · 3 to confirm

Safety issues the manufacturer must repair for free. A recall means confirm the fix was done, not walk away.

Fuel system recall

Confirm it was repairedRecall 23V445000 · Jun 2023

A loss of drive power can increase the risk of a crash.

Remedy
Dealers will replace the fuel pump, free of charge. Owner notification letters were mailed on June 14, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2023070012.
Status
Remedy available. Confirm by VIN that this repair was completed.
What to do
Enter the VIN on NHTSA's recall lookup to confirm this car was repaired.

Safety recall

Confirm it was repairedRecall 22V232000 · Apr 2022

An inoperable rearview camera display reduces the driver's rear view, increasing the risk of a crash.

Remedy
Dealers will update the rearview camera software, free of charge. Owner notification letters were mailed July 15, 2022. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2022060007.
Status
Remedy available. Confirm by VIN that this repair was completed.
What to do
Enter the VIN on NHTSA's recall lookup to confirm this car was repaired.

Seat belts recall

Confirm it was repairedRecall 21V032000 · Jan 2021

If the seat belt does not fully retract, the occupant may find the operation of the seat belt inconvenient and not wear it, increasing the risk of injury in the event of a crash.

Remedy
MBUSA will notify owners, and dealers will check the retraction function of the front seat belts and adjust the damping foam within the B-pillars, as necessary, free of charge. The recall began February 26, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021020010.
Status
Remedy available. Confirm by VIN that this repair was completed.
What to do
Enter the VIN on NHTSA's recall lookup to confirm this car was repaired.

Electrical system recall

Fixed over the airRecall 22V365000 · May 2022

A disabled eCall system would prevent a vehicle occupant from contacting the emergency services call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.

Remedy
The communication module software will be updated through an Over-the-Air (OTA) update or by a dealer, free of charge. Owner notification letters were mailed July 8, 2022. Owner notification letters will be mailed in phases, on July 8, 2022, May 17, 2024, July 29, 2024, and September 27, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's numbers are for this recall is 2022060005 and 2023110006.
Status
Corrected automatically through an over-the-air software update.
What to do
Enter the VIN on NHTSA's recall lookup to confirm this car was repaired.

Electrical system recall

Fixed over the airRecall 21V058000 · Feb 2021

Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.

Remedy
MBUSA will notify owners, and the communication module software will be updated by a dealer, or through an over-the-air (OTA) update, free of charge. The recall began March 12, 2021. Owners may contact MBUSA customer service at 1-877-762-8267. MBUSA's number for this recall is 2021020025.
Status
Corrected automatically through an over-the-air software update.
What to do
Enter the VIN on NHTSA's recall lookup to confirm this car was repaired.

Owner complaints by system

10 total

Unverified reports owners filed with NHTSA, grouped by the part of the car. Useful for spotting patterns. Open a group to read recent examples.

Engine & powertrain

Minor
8

Most reports here involve sudden stalling.

sudden stalling 3premature wear 2
A recent report: 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…
Read full complaint

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 was determined that the spawn rod was fractured, causing engine failure. The contact was informed that the engine needed to be replaced. The vehicle was not repaired. The contact stated that the engine was previously repaired because of the head gasket failure in 2024. The manufacturer was informed of the issue, and a case was opened. The failure mileage was approximately 88,000.

Source: NHTSA complaint ODI #11755408 · view all complaints for this vehicle at nhtsa.gov

Electrical & infotainment

Minor
1

Most reports here involve software faults.

software faults 1
A recent report: Rearview camera not displaying any image when transmission is put in reverse.

Source: NHTSA complaint ODI #11623522 · view all complaints for this vehicle at nhtsa.gov

Structure & body

Minor
1

Most reports here involve other issues.

other issues 1
A recent report: 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…
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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. This issue occurred without misuse and during normal operation of the vehicle. The defect creates a safety concern because it can distract the driver, allow water intrusion that may affect electrical components, and/or cause sudden glass or mechanical failure while driving. The vehicle has been taken to a Mercedes-Benz dealership for diagnosis and the issue was not resolved due to denied coverage. I was informed that the repair would be costly despite the issue appearing to be a known defect in Mercedes-Benz panoramic sunroof systems. I believe this defect may affect other Mercedes-Benz vehicles with panoramic sunroofs and should be investigated for a potential safety defect or recall.

Source: NHTSA complaint ODI #11712287 · view all complaints for this vehicle at nhtsa.gov

Is 10 complaints a lot? They were filed between 2024 and 2026, roughly 6 a year, which is fewer than the typical model in this dataset. We do not have sales figures for this model, so treat this as a rough volume, not a rate per car on the road. Popular, high-volume models naturally collect more complaints over time.

How does it compare with other years? The 2021 has 10 complaints on file, fewer than the 2020 (15) and fewer than the 2023 (18). Of the 6 model years of the Mercedes-Benz C 300 we cover, the 2018 has the most (99). Older model years have had longer to collect complaints.