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2021 Mercedes-Benz C-Class problems, recalls and owner complaints
What the 2021 Mercedes-Benz C-Class has been recalled for, how often it fails the UK MOT and what owners report, from official government data. Updated October 25, 2026.
- 6safety recalls
- 17owner complaints
- 0crash reports
- 0fire reports
- 7%fail the UK MOT
17 complaints, against an average of 200 for the other 14 Mercedes-Benz C-Class model years.
Every Mercedes-Benz C-Class model year with its number of owner complaints. Pick a year to compare.
What goes wrong with the 2021 Mercedes-Benz C-Class?
The components named most often in the 17 owner complaints. One complaint can name several, so the shares can add up to more than 100%.
What symptoms do 2021 Mercedes-Benz C-Class owners describe?
Found by reading the text of all 17 owner complaints. Tap a symptom for the answer, a real owner quote and any related recall.
Has the 2021 Mercedes-Benz C-Class been recalled?
6 U.S. safety recalls. Repairs are free at a franchised dealer; some are done over the air.
Fuel System, Gasoline: Delivery: Fuel Pump Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021-2023 C-Class, E-Class, S-Class, CLS, SL, GT, GLC, GLE, GLS, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle details. The fuel pump may shutdown, which can result in a loss of drive power.
Risk: A loss of drive power can increase the risk of a crash.
Fix: 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.
Electrical System: SoftwareOver-the-air fix Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2022 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, AMG GT-Class, C-Class, E-Class, S-Class, SL-Class, GLC-Class, CLS-Class, GLB-Class, and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. An error in the communication module's SIM card software can cause a mobile network connection failure, disabling the emergency call (eCall) system.
Risk: 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.
Fix: 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.
Back Over Prevention: Display Function Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018-2021 CLA-Class, GLE/GLS-Class, A-Class, C-Class, E-Class, E-Class Coupe/Convertible, GLA/GLB-Class, GLC-Class, and CLS-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. The rearview camera may not display the rearview image due to a software error. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 111, "Rear Visibility."
Risk: An inoperable rearview camera display reduces the driver's rear view, increasing the risk of a crash.
Fix: 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.
Seats: Mid/Rear Assembly: Head Restraint Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 C300 Cabriolet, C43 AMG Cabriolet, C63 AMG Cabriolet, C63 AMG S Cabriolet, E450 Cabriolet, and E53 AMG Cabriolet vehicles. The rear headrests may be incorrectly mounted to the seatbacks.
Risk: Incorrectly mounted headrests could move or detach from the seat during a crash, increasing the risk of injury.
Fix: Dealers will inspect the rear seatback guide bushings and replace them if necessary, free of charge. Owner notification letters were mailed July 16, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021060010.
Seats Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2021 C-Class, E-Class, E-Class Coupe and Convertible, GLC, CLS, AMG GT 4-door Coupe and G-Class vehicles. Please refer to MBUSA's recall report for specific vehicle model details. A faulty electrical contact within the seat position switch may prevent the driver and passenger air bags and seat belt force limiters from properly activating during a crash.
Risk: Air bags and seat belts that do not perform properly in a crash can increase the risk of injury.
Fix: MBUSA will notify owners, and dealers will replace the seat position switches, free of charge. Owner letters were mailed May 21, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021040016.
Electrical System: SoftwareOver-the-air fix Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2016 - 2021 CLA-Class, GLA-Class, GLE-Class, GLS-Class, SLC-Class, A-Class, GT-Class, C-Class, E-Class, S-Class, CLS-Class, SL-Class, B-Class, GLB-Class, GLC-Class, and G-Class vehicles. Please refer to the Part 573 report for specific vehicle model details. The software design of the communication module may fail to communicate the correct vehicle location for the emergency call system (eCall) in the event of a crash.
Risk: Failure of the eCall system may result in emergency responders being dispatched to the wrong location, increasing the risk of injury following a crash.
Fix: 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.
Is the 2021 Mercedes-Benz C-Class recalled in the UK or Europe?
Recalls issued by the UK's DVSA and through the EU's Safety Gate system that cover this model and build period. European models can differ from U.S. ones, and "years estimated" means the recall gave no build dates, so confirm your own car with your registration or VIN.
UK DVSASRPC2419 Misfire Detection M264
Risk: The software of the engine control unit might not meet specifications regarding misfire detection.
Fix: Mercedes-Benz AG via its Mercedes-Benz service partners will update the software of the engine control unit on the affected vehicles.
UK DVSASRPC2410 – Bolting Connection Pre-Fuse Box
Risk: On affected vehicles the bolting of an electrical wire on the pre-fuse box in the passenger-side footwell might have not been tightened with sufficient torque.
Fix: Check the bolting connection of the wiring harness to the pre-fuse box and repair if necessary.
UK DVSASRPC2413 - Screw connections of 12 V and 48 V ground pointsScrew connections of 12 V and 48 V ground points
Risk: On affected vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Fix: Check connections and repair if necessary.
UK DVSASRPC2407 – Battery Pole Cover
Risk: On affected vehicles the cover for a pole of the 12V battery might not be installed.
Fix: Check whether the battery positive pole covers have been installed and if necessary install it.
UK DVSAWelding between fuel filler pipe and fuel tank might not meet specifications
Risk: On affected vehicles the welding between fuel filler pipe and fuel tank might not meet specifications.
Fix: Replace the fuel tank.
UK DVSAOn affected vehicles the cable lug of the 48V ground connection in the engine compartment might not be fixed correctly.
Risk: On affected vehicles the cable lug of the 48V ground connection in the engine compartment might not be fixed correctly.
Fix: Check the bolting of the ground connection on the affected vehicles and repair if necessary
UK DVSAOn affected vehicles the fuel pump impeller might not meet specifications and may deform.
Risk: On affected vehicles the fuel pump impeller might not meet specifications and may deform.
Fix: Replace the fuel pump module.
UK DVSAOn affected vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Risk: On affected vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Fix: Check the bolting of the ground connections and repair if necessary.
UK DVSAOn affected vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Risk: On affected vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Fix: Check the bolting of the ground connections and repair if necessary.
UK DVSAMercedes-Benz AG has determined that on certain C-Class (206 platform) vehicles the bolts of certain 12V and 48V ground connections might…Mercedes-Benz AG has determined that on certain C-Class (206 platform) vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Risk: On affected vehicles the bolts of certain 12V and 48V ground connections might be fastened with an insufficient torque.
Fix: Check the bolting of the ground connections and repair if necessary.
UK DVSAOn affected vehicles the inflation of the front passenger airbag might not meet specifications.
Risk: On affected vehicles the inflation of the front passenger airbag might not meet specifications.
Fix: Replace the front passenger airbag.
UK DVSAOn affected vehicles the bolting of the 48V ground connection in the engine compartment might not be sufficiently tightened.
Risk: On affected vehicles the bolting of the 48V ground connection in the engine compartment might not be sufficiently tightened.
Fix: Check the bolting of the ground connection and correct if necessary.
UK DVSAThe holding force of the fuel feed line may not correspond with the specifications
Risk: The holding force of the fuel feed line may not correspond with the specifications.
Fix: Check the fuel line on the affected vehicles and replace it if necessary.
UK DVSASoftware of the communication module may not correspond with the specifications
Risk: The software of the communication module may not correspond with the specifications.
Fix: Update the software of the communication module in the affected vehicles.
UK DVSAWater ingress into the trunk and therefore moisture might enter into the signal acquisition and actuation module
Risk: Moisture may ingress into the signal acquisition module.
Fix: Retro fit a cover to the signal acquisition module.
UK DVSAThe engine control unit wiring harness might come in contact with the engine hood
Risk: The engine control unit wiring harness might come in contact with the engine hood.
Fix: Check the routing of the engine control unit wiring harness and correct it if necessary.
UK DVSAVehicles might be equipped with an incorrect variant of the tyre pressure label in the tank flap
Risk: Vehicles might be equipped with an incorrect variant of the tyre pressure label in the tank flap.
Fix: The tyre pressure label is to be replaced.
UK DVSAThe software of the rear signal acquisition and actuation module might not meet specifications
Risk: The software of the rear signal acquisition and actuation module might not meet specifications.
Fix: Update the software of the signal acquisition and actuation module on the affected vehicles.
UK DVSAThe overhead control panel might be deactivated permanently due to a software error
Risk: The overhead control panel under certain circumstances might be deactivated permanently due to a software error.
Fix: Update the software of the overhead control panel.
UK DVSAThe software of the communication module might not meet specifications
Risk: On certain vehicles the software of the communication module might not meet specifications.
Fix: As a precautionary measure update the software of the communication module on the affected vehicles. This software update is planned to be performed over-the-air with no workshop visit being required.
UK DVSAThe software of the communication module might not meet specifications
Risk: On certain vehicles the software of the communication module might not meet specifications.
Fix: As a precautionary measure update the software of the communication module on the affected vehicles. This software update is planned to be performed over-the-air with no workshop visit being required.
UK DVSAThe configuration of the mbux system might not meet specifications
Risk: On certain vehicles with an active and connected Mercedes me connect account the configuration of the MBUX system might not meet specifications.
Fix: Update the configuration of the MBUX system on affected vehicles.
UK DVSAThe software of the engine control unit might not meet specifications
Risk: On certain vehicles the software of the engine control unit might not meet specifications.
Fix: Conduct an update the software of the engine control unit on the affected vehicles.
UK DVSACoolant pump might have a leakage between the vacuum system and the coolant circuit
Risk: On certain vehicles with a Diesel engine the coolant pump which is controlled by vacuum might have a leakage between the vacuum system and the coolant circuit.
Fix: Update the software of the coolant pump and replace the electrical switch valve on the affected vehicles.
UK DVSAThe configuration of the mbux system might not meet specifications.
Risk: On certain vehicles with an active and connected Mercedes me connect account the configuration of the MBUX system might not meet specifications.
Fix: A remote update of the configuration of the MBUX system will be conducted without the need for a workshop visit.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAA nozzle inside the suction jet pump in the fuel tank might not have been installed or fixed inside the pump according to specifications
Risk: A nozzle inside the suction jet pump in the fuel tank might not have been installed or fixed inside the pump according to specifications.
Fix: Conduct a check of the fuel system on the affected vehicles and replace the fuel tank including the suction jet pump if necessary.
UK DVSAThe belt tensioner arm may have been manufactured with borderline tolerance
Risk: The belt tensioner arm may have been manufactured with borderline tolerance.
Fix: Replace the belt tensioner. Additionally check the v-ribbed belt on the affected vehicles and replace it if necessary.
UK DVSAThe fixation of the rear headrests might not meet specifications
Risk: The fixation of the rear headrests might not meet specifications.
Fix: Check the guide sleeves on the rear seats of the potentially affected vehicles and replace them if necessary.
UK DVSAThe bolting of the high voltage battery to the vehicle body in the luggage compartment might not meet specifications
Risk: The bolting of the high-voltage battery to the vehicle body in the luggage compartment might not meet specifications.
Fix: Check the bolting of the high-voltage battery to the vehicle body on the affected vehicles and rework if necessary.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe connection of the gas lines of the inertisation system might not meet specifications
Risk: The connection of the gas lines of the inertisation system might not meet specifications.
Fix: Check and if necessary rework the gas lines of the inertisation system.
UK DVSAThe emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe behaviour of the emergency call system might not meet specifications
Risk: The behaviour of the emergency call system might not meet specifications.
Fix: Update the software of the communication module for the emergency call system.
UK DVSAThe communication module may be deactivated
Risk: The communication module may be deactivated
Fix: Carry out a check of the configuration of the communication module on affected vehicles and if necessary activate the communication module.
EU Safety GateThe safety cap on the end mount of the seat belt of the passenger seat may not be correctly installed.The safety cap could become detached over the life of the vehicle, and the belt would no longer be fixed in its anchorage. In the event of abrupt deceleration or in the event of an accident, the belt may no longer have a restraining effect, thereby increasing the risk of accident/injury.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateGround-cable bolts may not have been tightened with sufficient torque.This can lead the wiring harness not to be properly secured and result in an increase of the connection's electrical resistance. The temperature can rise in this area, increasing the risk of fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe incorrect connection of a wiring harness to the pre-fuse box can cause a failure and increased electrical resistance.This can lead to a sudden loss of propulsion, which increases the risk of accidents and injuries. Moreover, this can increase the risk of fire in the vehicle.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateFaulty welding between the fuel tank and the filler pipe can cause a fuel leak, creating a risk of fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe tightening torque on the screw connections on certain 12V and 48V ground points may be insufficient.This may lead to improper wiring fixation, which may cause rise of temperature in this area, increasing the risk of fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateFuel may leak and the fuel line pressure may drop, leading to misfires or even engine stalling while driving, increasing the risk of an…Fuel may leak and the fuel line pressure may drop, leading to misfires or even engine stalling while driving, increasing the risk of an accident. Moreover, fuel leaks could pose a risk to following traffic.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe airbag control unit may be faulty, resulting in that the PRE-SAFE function and/or the active bonnet are not activated as intended,…The airbag control unit may be faulty, resulting in that the PRE-SAFE function and/or the active bonnet are not activated as intended, increasing the risk of injury in case of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateImproper foam used in the front bumper may cause the active hood release to fail to deploy in the event of a collision with a pedestrian,…Improper foam used in the front bumper may cause the active hood release to fail to deploy in the event of a collision with a pedestrian, increasing the risk of injury.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe gearbox may be faulty.Forces and vibrations may occur when driving, which could damage the gear-shift linkage and the gearbox could disconnect from the drive shaft, causing the vehicle to lose propulsion. Moreover, components could detach from the vehicle, posing a risk to other road users.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateImproperly connected layers of the windscreen could lead to its delamination in the event of an accident.Moreover, glass splinters could break free and impair the support of the passenger airbag.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateMoisture could enter the signal acquisition and actuation module.In this case, a short circuit may occur and as a result the risk of fire increases. Moreover, this moisture may cause the exterior lighting at the rear of the vehicle to fail, the rear backseat may unintentionally fold, and the rear-view camera may not be available, increasing the risk of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateImproper tyre pressure label in the tank cap may result in the tyre pressure not being identified based on the vehicle load and thus the…Improper tyre pressure label in the tank cap may result in the tyre pressure not being identified based on the vehicle load and thus the vehicle operating with insufficient tyre pressure. As a result, the tyre may be damaged, increasing the risk of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateAn erroneous notch in the impact absorber may lead to failure of the tube sensor for the actuation of the active hood.In case of an accident, the active hood for pedestrian protection might be lifted too late or not at all, increasing the risk of injury to the pedestrian involved.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe latching of the electrical connector of the left acceleration crash sensor onto the cross beam may not be in line with specifications,…The latching of the electrical connector of the left acceleration crash sensor onto the cross beam may not be in line with specifications, so the electrical connector of the crash sensor might become detached as a result of vibration while the vehicle is driven or in an accident with multiple impacts. As restraint systems will not be triggered, this could reduce the restraint effect, increasing the risk of injury.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe cupholder in the centre armrest of the second seat row may become detached from the armrest in the event of an accident.This could increased the risk of injury to occupants of the vehicle.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe vacuum-controlled coolant pump may not be tightly sealed between the coolant and vacuum circuits.This may result in the coolant leaking into the vacuum circuit leading to an electrochemical reaction, increasing the risk of fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateDue to an incorrect material composition of the Mode 2 charging cable for charging at a household power socket, the insulation resistance…Due to an incorrect material composition of the Mode 2 charging cable for charging at a household power socket, the insulation resistance of the rubber buffer could be impaired, overriding the protective function of the charging cable. Furthermore, in combination with an error in the householdinfrastructure, the activation of the protective device in the household electrical circuit might be prevented. This could cause the user to have an electrical shock and could lead to a fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateA trapped particle may damage the sealing between the fuel rail and fuel injector, which could cause fuel to leak into the engine…A trapped particle may damage the sealing between the fuel rail and fuel injector, which could cause fuel to leak into the engine compartment. Consequently, leaking fuel may come into contact with hot parts of the engine, increasing the risk of fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateIn some cases the end mount of the seat belt on the driver’s seat may not have been fitted in accordance with the specifications, for this…In some cases the end mount of the seat belt on the driver’s seat may not have been fitted in accordance with the specifications, for this case the end mount of the seat belt would be held in position only by the external seat trim. In the event of adverse conditions or an accident this could seriously impair the restraining function of the seat belt and increase the risk of injury to the driver.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateIn certain GLE/GLS (BR 167) and C-class vehicles, the seats might be constructed incomplete or with unintended trim, increasing the risk…In certain GLE/GLS (BR 167) and C-class vehicles, the seats might be constructed incomplete or with unintended trim, increasing the risk of injury in the event of an accident.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe belt tensioner arm may have been manufactured with a borderline tolerance, which could cause one side of the V-ribbed belt to rub…The belt tensioner arm may have been manufactured with a borderline tolerance, which could cause one side of the V-ribbed belt to rub against the belt tensioner, causing it to fail. As a result, the coolant pump may stop working, causing the engine to overheat, thus compromising the impermeability of the oil sump. Consequently, oil may leak onto the road, posing a risk to the following traffic.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe high-voltage battery might not be correctly screwed to the body of the vehicle in the boot area.As a result, it could become detached in the event of an accident, increasing the risk of injury to the occupants of the vehicle.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe rear head rests might not have been attached correctly.As a result, they could become displaced or detached from the seat in the event of an accident, increasing the risk of injury.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateThe polycarbonate roof panel located between the windscreen and the panoramic roof may not have been bonded correctly to the vehicle…The polycarbonate roof panel located between the windscreen and the panoramic roof may not have been bonded correctly to the vehicle during a prior repair. In such cases, the adhesive bonding could gradually deteriorate and the panel could become detached from the vehicle, posing a risk to other road users.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateFaulty connection of the inerting system’s gas pipes could impair the intended distribution of argon shielding gas to the points where…Faulty connection of the inerting system’s gas pipes could impair the intended distribution of argon shielding gas to the points where there could be contact between the leaking refrigerant R1234yf and hot engine components in the event of an accident.This would reduce the cooling effect of the inerting gas, leading to increased risk of fire.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
EU Safety GateDue to delivery of the wrong complete winter tyre kit, clients/garages may have installed a wheel-tyre-combination which is not authorised…Due to delivery of the wrong complete winter tyre kit, clients/garages may have installed a wheel-tyre-combination which is not authorised for the vehicles. When driving, high loads together with high speeds could overstrain the tyres and result in inadmissible heating which could cause damage to the tyres.
Measures: Type of economic operator taking notified measure(s): Manufacturer; Category of measure(s): Recall of the product from end users; Date of entry into force: Unknown
How often does the 2021 Mercedes-Benz C-Class fail its MOT?
Why they failed: the share of failed tests with at least one fault in each area (a test can fail on several). Cars first registered in 2021, tested in Great Britain in 2023; first registration is usually, but not always, the model year. Source: DVSA anonymised MOT tests and results, Open Government Licence v3.0.
What do 2021 Mercedes-Benz C-Class owners report?
12 of the 17 complaints, the most recent for the most-reported components, as the owners wrote them. NHTSA removes names and VINs; long reports are trimmed. CarHooq has not verified individual claims.
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 contact owns a 2021 Mercedes Benz C. The contact stated that while driving on the highway, the vehicle began to lose power, riding rough. The check engine light illuminated. The vehicle was towed to the dealer where it was diagnosed with a fuel injection failure. The vehicle read diagnostic code P1CEF85. The manufacturer was made aware of the issue. The approximate failure mileage was 60,000.
The contact owns a 2021 Mercedes-Benz C300. The contact stated that while driving at an undisclosed speed, the vehicle stalled and failed to exceed 30 MPH, with the check engine warning light illuminated. The vehicle did not require a restart. The contact also stated that while stopped at a traffic light, the vehicle was shaking abnormally. The vehicle was taken to an independent mechanic, where it was diagnosed and determined that there was a misfire in cylinder #2. The contact was informed that the cylinder head needed to be replaced. The vehicle was not repaired. The vehicle was then taken…
Driving and something came from underneath the vehicle and cause me to swerve in all the airbags deployed
My car had a coolant leak last year a hose broke and I have a 2021. My son’s mercedes sis the same thing on 11/23/2025. I have researched ma y others with this same issue. There should be a recall on that hose or whatever the problem Is.
2021 Mercedes-Benz C300 with M254 2.0L turbo engine experienced sudden cylinder head failure at 44,000 miles due to manufacturing porosity in the cylinder head and camshaft bore scoring. Dealer confirmed defect. This is a known, recurring issue on 2021–2023 M254 engines with multiple documented failures under 50k miles. Sudden loss of compression and misfires create a safety risk of engine failure or fire while driving. TSB NUMBER LI07.16-P-074000 (February 2023, updated multiple times). This is a known production/early break-in issue with the M254 engine, not the result of owner misuse or…
While driving car on Sunday 10/5, it suddenly failed to respond to gas pedal pressure. The car stopped accelerating and rather slowed to 15 MPH, almost causing a car from behind to hit me in the rear side.
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…
Cylinder head needed to be replaced on the M264 engine at 35,000 miles. The replacement part is also known to be defective for the same reasons. This is a common defect known to the manufacturer and they have not issued a recall. My concern is that of a roadside breakdown that would endanger my wife and myself. Thank you for your consideration.
Rearview camera not displaying any image when transmission is put in reverse.
First day leasing the vehicle within 6 hours lights malfunction and malfunction warning on dash to seek workshop, vehicle was taken for inspection to original dealer (Mercedes Benz of Bakersfield). During inspection I added additional concerning complaints about passenger door not closing correctly/wind noise seeping through when closed, and hood not closing promptly. One month into leasing vehicle passenger window malfunction, took for inspection and repair to original dealer (MBofBakersfield). Concerned with caution for me, my family, and friends when in that vehicle for giving faulty signs…
The contact owns a 2021 Mercedes-Benz C300. The contact stated while driving at an unknown speed, there was a burning odor inside the vehicle. The contact stated the passenger side air bags was enabled warning light was illuminated. The contact also stated the vehicle made an abnormal noise. The contact took the vehicle to the local dealer but was unable to duplicate the failure. The manufacturer had not been informed of the failure. The failure mileage was unknown.
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2021 Mercedes-Benz C-Class: questions owners ask
Is the 2021 Mercedes-Benz C-Class reliable?
NHTSA data alone cannot rate reliability, but it shows what owners reported. Owners filed 17 complaints with NHTSA about the 2021 Mercedes-Benz C-Class; the most common categories were engine (8, 47.1%), air bags (2, 11.8%), fuel/propulsion system (2, 11.8%). There are 6 safety recalls.
What are the most common problems with the 2021 Mercedes-Benz C-Class?
Across 17 owner complaints filed with NHTSA, the categories mentioned most often are engine (47.1% of complaints), air bags (11.8% of complaints), fuel/propulsion system (11.8% of complaints), power train (11.8% of complaints), back over prevention (5.9% of complaints). One complaint can name several components.
Does the 2021 Mercedes-Benz C-Class have any recalls?
Yes. NHTSA lists 6 recalls for the 2021 Mercedes-Benz C-Class; the most recent (campaign 23V445000, 2023-06-26) concerns Fuel System, Gasoline: Delivery: Fuel Pump. Recall repairs are free at a franchised dealer; check your VIN at nhtsa.gov/recalls.
Has the 2021 Mercedes-Benz C-Class had engine failures?
4 of the 17 owner complaints NHTSA has on file for the 2021 Mercedes-Benz C-Class (23.5%) describe complete engine failure or a replaced engine. One owner wrote: "2021 Mercedes-Benz C300 with M254 2.0L turbo engine experienced sudden cylinder head failure at 44,000 miles due to manufacturing porosity in the cylinder head and camshaft bore scoring. Dealer confirmed defect." (NHTSA complaint 11701560, November 2025). If it happens to your car, check your VIN for open recalls at nhtsa.gov/recalls and report the problem to NHTSA; complaints are what trigger investigations.
Why is the check engine light on in my 2021 Mercedes-Benz C-Class?
3 of the 17 owner complaints NHTSA has on file for the 2021 Mercedes-Benz C-Class (17.6%) describe the check engine light coming on. One owner wrote: "the check Engine light fault code P012D12 The pressure sensor upstream of the turbocharger had a short circuit to positive. Found Kink wire on upstream pressure sensor. A short circuit to positive. Electrical Wire replaced." (NHTSA complaint 11579561, March 2024). If it happens to your car, check your VIN for open recalls at nhtsa.gov/recalls and report the problem to NHTSA; complaints are what trigger investigations.
Check your own C-Class
Counts are a starting point, not a verdict: popular models collect more complaints because more of them are on the road, and NHTSA does not verify individual reports. To see whether a recall is still open on your car, enter your VIN at nhtsa.gov/recalls (U.S.) or your registration at check-vehicle-recalls.service.gov.uk (UK). Had a safety problem? Report it to NHTSA; complaints are what trigger investigations and recalls.
Data: NHTSA Office of Defects Investigation recall and complaint databases (public domain), DVSA anonymised MOT results (Open Government Licence v3.0), DVSA vehicle recalls (Open Government Licence v3.0), EU Safety Gate alerts (© European Union), retrieved October 25, 2026. Model year 2021 only; combines NHTSA's entries for AMG C43, AMG C63 S, C-CLASS and C-CLASS CABRIOLET.