Mercedes-Benz · NHTSA safety record

2018 Mercedes-Benz C 300

Every safety complaint, recall and defect investigation the US government holds on this vehicle.

Owners have filed 99 safety complaints about the 2018 Mercedes-Benz C 300 with the US government. Of those, 4 describe a crash, 1 person was injured and no death is recorded. 18 recall campaigns are open against it.

The most complained-about system is the engine, named in 34 complaints, 34% of the total. The typical failure was reported at 50,000 miles, the median across the 21 complaints that gave an odometer reading.

Compiled from NHTSA's complaint, recall and investigation files · Covers June 2018 to September 2026 · How this is counted

What is on file

99 complaints on file

Complaints

Describe a crash

Mention fire

People injured

Deaths

A complaint is an unverified account by the person who filed it, not a finding of fault. One complaint is one ODI number, which is how NHTSA counts them.

Complaints fell 30% year on year: 7 in the twelve months to 2026-Q2, against 10 in the twelve before.

A recall is the manufacturer conceding a defect, and the repair is free. Whether one covers your particular car is a question only its VIN can answer, because a campaign covers a production range rather than a model year. A further 1 defect investigation is open and unresolved.

Which system owners named

Complaints naming each system

ENGINE 34 · 34% 34 34%

UNKNOWN OR OTHER 20 · 20% 20 20%

STRUCTURE 14 · 14% 14 14%

STEERING 12 · 12% 12 12%

ELECTRICAL SYSTEM 10 · 10% 10 10%

FUEL/PROPULSION SYSTEM 9 · 9% 9 9%

AIR BAGS 4 · 4% 4 4%

FORWARD COLLISION AVOIDANCE 4 · 4% 4 4%

COMMUNICATION 3 · 3% 3 3%

VISIBILITY 3 · 3% 3 3%

EXTERIOR LIGHTING 2 · 2% 2 2%

POWER TRAIN 2 · 2% 2 2%

0 15 31

Red marks a system with a recall campaign against it. One complaint can name several systems, so these add up to more than 99.

When the complaints arrived

By the year NHTSA received them

By the year NHTSA received them, which is not the year the failures happened. They peaked in 2023 at 24.

28 21 14 7

18 2018 19 2019 20 2020 21 2021 22 2022 23 2023 24 2024 25 2025 26 2026

This is the year the complaint was filed, not the year the failure happened. The range runs from 2018 to 2026, the last of them a part year, which is why its column is drawn faint.

Crash test ratings

NHTSA New Car Assessment Program

NHTSA has not crash tested the 2018 Mercedes-Benz C 300. Its New Car Assessment Program tests a selection of each year's vehicles and does not reach motorcycles, heavy trucks, motorhomes or most low-volume models, so an absence here says nothing about how the vehicle would perform. It is not a low score.

What owners have reported about this vehicle is below, and it is a different question: a crash test measures what happens to the people inside in a controlled impact, while a complaint records what broke during ordinary use.

Recall campaigns

18 on file

STRUCTURE:BODY:ROOF AND PILLARS

23V854000 · December 15, 2023

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2014-2020 C-Class, CLA, GLA, S-Class, GLC, and GLE vehicles. Please refer to MBUSA's recall report for specific vehicle details. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair, allowing the front panel to detach from the vehicle.
The risk: A detached roof panel can become a road hazard, increasing the risk of a crash.
The remedy: Dealers will replace the front panel, free of charge. Owner notification letters were mailed on August 2, 2024. Owner notification letters will be mailed in phases, on, March 22,2024, and August 2, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. This recall is an expansion of NHTSA recall number 21V-197.

Mercedes-Benz USA, LLC · up to 2,976 vehicles across all model years covered

ELECTRICAL SYSTEM:SOFTWARE

22V365000 · May 20, 2022

The defect: 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.
The 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.
The 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.

Mercedes-Benz USA, LLC · up to 242,722 vehicles across all model years covered · fixed by software update

EXTERIOR LIGHTING:HEADLIGHTS

21V509000 · July 2, 2021

The defect: Mercedes-Benz LLC (MBUSA) is recalling certain 2018-2020 C300, 2019-2020 A220, AMG C43, AMG C63, 2020 GLE580, GLB250, 2020-2021 GLE450, GLE350, 2021 AMG GLE63, and AMG GLE53 vehicles. The LED headlights may have been incorrectly adjusted during a vehicle repair. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 108, "Lamps, Reflective Devices, and Associated Equipment."
The risk: Incorrectly adjusted headlights may reduce visibility, increasing the risk of a crash.
The remedy: Dealers will replace the LED headlights, free of charge. Interim letters notifying owners of the safety risk were mailed August 13, 2021. A second notice will be sent once the remedy is available. Owner notification letters were mailed January 2022. Owners may contact MBUSA customer service at 1-800-367-6372.

Mercedes-Benz USA, LLC · up to 1,467 vehicles across all model years covered

STRUCTURE:BODY:ROOF AND PILLARS

21V197000 · March 19, 2021

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2020 C300 Coupe, C43 Coupe AMG, C43 AMG, 2015-2020 C300, GLA250, 2016-2018 C350e, CLA45 Coupe AMG, 2015 C400, S65 AMG, 2015-2019 C63 AMG, 2016 C450, 2015-2016 GLA45 AMG, S600, 2016-2020 GLC300, 2017-2019 GLC43 AMG, GLE43 Coupe AMG, 2014-2019 CLA250 Coupe, 2014-2015 CLA45 AMG, 2018 GLC63 AMG, 2014-2017 S550, 2018-2020 S450, 2016-2019 GLE63 Coupe AMG, 2016 GLE450 Coupe, 2014-2020 S63 AMG, 2018-2019 S560, and 2019 GLC350e vehicles equipped with a panoramic sunroof. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair.
The risk: The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detach from the vehicle and become a road hazard, increasing the risk of a crash.
The remedy: Mercedes-Benz dealer will remove the bonded panel and will install a new front panel by following the detailed repair instructions and using the approved primer, cleaner and adhesive, free of charge. Owner notification letters were mailed on September 3, 2021 and October 26, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.

Mercedes-Benz USA, LLC · up to 15,096 vehicles across all model years covered

COMMUNICATION

21V072000 · February 12, 2021

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2019 C300, E300, 2018-2020 CLA250, 2020 CLS450, AMG E53, AMG GT53, GLE450, 2018 AMG E63, AMG GTA, 2017-2020 GLA250, GLC300, 2019 GLC350, AMG GLC43, 2017-2018 GLE350, 2019 AMG GLC 43, GLC350, GLE400, 2017 GLS450, S550, C300 Cabrio, and 2018-2019 S560 vehicles. On June 18, 2021, an additional 9 vehicles were added, including certain 2021 GLA250, GLC300, 2018 S450, E400, and 2017 CLA250 vehicles. The communication module might have been inadvertently deactivated during a service visit, which could have disabled the Emergency Call (eCall) function.
The risk: A disabled eCall system would prevent a vehicle occupant from contacting emergency services through the call center in an emergency, potentially delaying emergency responders and increasing the risk of injury.
The remedy: MBUSA will notify owners, and dealers will inspect the communication module and activate it, if necessary, free of charge. The recall began March 31, 2021. Letters for the owners of the 9 additional vehicles were mailed July 9, 2021. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2021030005.

Mercedes-Benz USA, LLC · up to 67 vehicles across all model years covered

ELECTRICAL SYSTEM:SOFTWARE

21V058000 · February 5, 2021

The defect: 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.
The 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.
The 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.

Mercedes-Benz USA, LLC · up to 1,292,258 vehicles across all model years covered · fixed by software update

SEAT BELTS:FRONT:RETRACTOR

21V032000 · January 29, 2021

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2021 C300, 2017-2020 AMG C43, and AMG C63 vehicles. The front seat belts might not fully retract to their stowed position. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 208, "Occupant Crash Protection."
The risk: 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.
The 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.

Mercedes-Benz USA, LLC · up to 24,550 vehicles across all model years covered

ELECTRICAL SYSTEM:12V/24V/48V BATTERY

19V586000 · August 9, 2019

The defect: Mercedes-Benz USA, LLC. (MBUSA) is recalling certain 2018-2019 C300, C300 4MATIC, and C43 AMG 4MATIC vehicles. The mounting bracket for the 12-volt battery may not be secured. This may allow the battery to shift, possibly disconnecting the terminals in the event of a crash.
The risk: Loss of power from the battery can impair post-crash functions, such as communicating with emergency services and activating hazard lights. The battery may also detach and become a road hazard. Either of these scenarios can increase the risk of injury.
The remedy: MBUSA will notify owners, and dealers will replace the battery mounting bracket, free of charge. The recall began October 18, 2019. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2019090010.

Mercedes-Benz USA, LLC. · up to 26,584 vehicles across all model years covered

SEATS

19V130000 · February 26, 2019

The defect: Mercedes-Benz USA, LLC (Mercedes) is recalling certain 2017-2018 Mercedes-Benz C300 Cabriolet, C300 Coupe, AMG C43 Coupe, C300 4MATIC Cabriolet, C300 4MATIC Coupe, AMG C43 Cabriolet, AMG C63 Cabriolet, AMG C63 Coupe, AMG C63 S Cabriolet and AMG C63 S Coupe vehicles and 2018 Mercedes-Benz E400 Coupe, E400 Cabriolet, E400 4MATIC Cabriolet and E400 4MATIC Coupe vehicles. The seatbacks of the front seats may not properly lock on the right side of the seat.
The risk: If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
The remedy: Mercedes will notify owners, and dealers will inspect the locking of the seatback on the affected vehicles and replace the seatback lock, as necessary, free of charge. An interim owner letter was mailed on April 12, 2019 to notify owners. Owners will receive a second notification when the remedy is available. Owners may contact Mercedes-Benz customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040007.

Mercedes-Benz USA, LLC. · up to 22,637 vehicles across all model years covered

EXTERIOR LIGHTING:HEADLIGHTS

18V906000 · December 19, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018 Mercedes-Benz C300 and C300 4MATIC vehicles. The headlights on these vehicles may not be properly adjusted. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 108, "Lamps, Reflective Devices, and Associated Equipment."
The risk: If the low beam headlight is not properly adjusted, the driver may have reduced visibility, increasing the risk of a crash.
The remedy: MBUSA has notified owners, and dealers will inspect the setting of the headlights and adjust them, as necessary, free of charge. The recall began March 12, 2019. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2019020008.

Mercedes-Benz USA, LLC. · up to 2,364 vehicles across all model years covered

STEERING

18V872000 · December 7, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling one 2018 Mercedes-Benz E400 Coupe and one C300 4Matic Coupe. The steering coupling may not have been correctly locked during manufacturing.
The risk: If the steering connection was not properly locked, the mechanical connection between the steering wheel and steering rack may come loose, reducing steering ability and increasing the risk of a crash.
The remedy: MBUSA will notify owners, and dealers will inspect the steering coupling and lock it correctly if necessary, free of charge. The recall began January 18, 2019. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018120010.

Mercedes-Benz USA, LLC. · up to 2 vehicles across all model years covered

STEERING:RACK AND PINION:RACK

18V850000 · November 29, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2015-2016 Mercedes Benz C300, 2017-2019 C300 Cabrio, C300 Coupe, C63 Cabrio, 2015 C63S AMG, 2018-2019 C300, C350e, C63 AMG, C63S AMG Cabrio, 2018 C63 AMG Cabrio, C63 AMG Coupe, C63S AMG, C63S AMG Coupe, E300, E400 Cabrio, E400 Coupe, 2019 CLS450, E450 Cabrio, and E450 Coupe rear-wheel drive vehicles. A locknut in the steering rack may break under high load, possibly causing the steering to become stuck in one position.
The risk: A car that cannot be properly steered has an increased risk of a crash.
The remedy: MBUSA will notify owners, and dealers will replace the steering rack, free of charge. The recall began August 23, 2019. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2019080012.

Mercedes-Benz USA, LLC. · up to 6,373 vehicles across all model years covered

AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION

18V838000 · November 27, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018 C300 Cabriolet, C300 Coupe, C300 4Matic Cabriolet, C300, C300 4Matic Coupe, C300 4Matic, C43 AMG Cabriolet, C43 AMG Coupe, C63 S AMG Cabriolet, C350e Plug-In Hybrid, C63 AMG Cabriolet, C63 AMG Coupe, C63 S AMG Coupe, C63 AMG, C63 S AMG, 2018-2019 GLC300 4Matic Coupe, GLC300, GLC63 AMG Coupe, GLC300 4Matic, GLC350e Plug-In Hybrid, GLC43 AMG Coupe, GLC43 AMG, GLC63 S AMG Coupe, and GLC63 AMG vehicles equipped with Audio 20 head units and automatic child seat recognition. The status of the passenger side air bag may not display correctly.
The risk: If the passenger air bag is incorrectly displayed as 'ON' when it is not, a front seat passenger may be unaware that the air bag will not deploy in the event of a crash, increasing their risk of injury.
The remedy: MBUSA will notify owners, and dealers will update the audio head unit software, free of charge. The recall began January 3, 2019. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018120009.

Mercedes-Benz USA, LLC. · up to 104,663 vehicles across all model years covered

ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES

18V725000 · October 15, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018 Mercedes-Benz C300 4Matic Coupe, C300 4Matic Cabrio, E300, E300 4Matic, C300, C300 4Matic, C300 Coupe and C300 Cabrio vehicles. The cover for the starter battery may not cover the live positive electrical wire, and in certain crashes, the vehicle's strut brace may deform and short circuit the battery.
The risk: If the battery is shorted, the emergency door unlocking would be deactivated for an outside responder and the short circuit could increase the risk of a fire.
The remedy: MBUSA will notify owners, and dealers will replace the positive pole cover, free of charge. The recall began November 27, 2018. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018110002.

Mercedes-Benz USA, LLC. · up to 4,073 vehicles across all model years covered

VISIBILITY:GLASS, SIDE/REAR

18V608000 · September 11, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2018 Mercedes-Benz C300, C300 4MATIC, C63 AMG, and C63S AMG vehicles. Incorrect bonding of the rear window may cause the window to loosen and detach from the vehicle.
The risk: If the window detaches from the vehicle, it can become a road hazard, increasing the risk of a crash.
The remedy: MBUSA will notify owners, and dealers will rework the rear window bonding, free of charge. The recall is expected to begin November 2, 2018. Owners may contact MBUSA customer service at 1-800-367-6372.

Mercedes-Benz USA, LLC. · up to 387 vehicles across all model years covered

STRUCTURE:BODY

18V456000 · July 10, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 Mercedes C300 Cabriolet, C300 4Matic Cabriolet, C43 AMG Cabriolet, C63S AMG Cabriolet, and C63 AMG Cabriolet vehicles. Due to a bonding issue introduced in the production process, the rear beltline trim may separate from the vehicle.
The risk: If the beltline trim were to separate from the vehicle while driving, it could become a road hazard, increasing the risk of a crash.
The remedy: MBUSA will notify owners, and dealers will inspect the rear beltline trim and replace the trim if necessary, free of charge. The recall began on September 21, 2018. Owners may contact MBUSA customer service at 1-800-367-6372.

Mercedes-Benz USA, LLC. · up to 10,826 vehicles across all model years covered

SEATS

18V207000 · March 29, 2018

The defect: Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 C43 AMG 4Matic Coupe, C300 Coupe, C300 4Matic Coupe, C300 4Matic Cabriolet, C300 Cabriolet, C43 AMG 4Matic Cabriolet and C63S AMG Cabriolet, 2017 C63 AMG Cabriolet, C63S AMG Coupe and C63 AMG Coupe, 2018 E400 Coupe and E400 4Matic Coupe vehicles. The seatbacks of the front seats may not properly lock on the right side of the seat.
The risk: If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
The remedy: MBUSA will notify owners, and dealers will inspect the locking of the seatbacks, replacing the seatbacks lock, as necessary, free of charge. The recall is expected to begin May 25, 2018. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018040007.

Mercedes-Benz USA, LLC. · up to 3,088 vehicles across all model years covered

AIR BAGS:FRONTAL

17V627000 · October 6, 2017

The defect: Mercedes-Benz USA, LLC. (MBUSA) is recalling these vehicles: 2014-2018 CLA250, CLA250 4Matic, CLA45 AMG 4Matic, 2015-2018 GLA250, GLA250 4Matic, GLA45 AMG 4Matic, C300 4Matic, C63S AMG, 2012-2014 C250, C350, C300 4Matic, E550 4Matic, 2013-2014 C63 AMG, 2012-2015 C250 Coupe, C350 Coupe, C63 AMG Coupe, 2013-2015 C350 4Matic Coupe, GLK250 4Matic BlueTec, GLK350, GLK350 4Matic, 2016-2017 C350e, C43 AMG, 2015 C400 4Matic, 2016-2018 C63 AMG, GLC300, GLC300 4Matic, 2017-2018 C300 Coupe, C300 4Matic Coupe, C43 AMG, C63 AMG Coupe, C63S AMG Coupe, C300 Cabriolet, C300 4Matic Cabriolet, C43 AMG Cabriolet, C63 AMG Cabriolet, C63S AMG Cabriolet, GLC300 4Matic Coupe, GLC43 AMG, GLC43 AMG Coupe, 2014 E350 Coupe, E350 4Matic Coupe, E350 Cabriolet, E400 Hybrid, 2015-2017 E400 Coupe, E400 4Matic Coupe, E400 Cabriolet, 2014-2017 E550 Coupe, E550 Cabriolet, B250e, 2014-2016 E250 BlueTec, E63 AMG 4Matic Wagon, 2012-2013 E350 BlueTec, 2012-2016 E350, E350 4Matic, 2015-2016 E400, E400 4Matic, 2012 E63 AMG, 2014-2015 E250 4Matic BlueTec, 2013-2016 E350 Wagon, 2017 GLC300d 4Matic, and 2018 GLC350e 4Matic. The driver's air bag may unexpectedly deploy due to insufficient grounding of the steering components if an electrostatic discharge occurs and the air bag clockspring is broken.
The risk: If the driver air bag inadvertently deploys, it can increase the risk of injury and a crash.
The remedy: MBUSA will notify owners, and dealers will add sufficient grounding to the steering components, free of charge. The recall began in December 6, 2017. Owners may contact MBUSA customer service at 1-877-496-3691.

Mercedes-Benz USA, LLC. · up to 495,290 vehicles across all model years covered

Defect investigations

2 on file

An investigation means NHTSA has decided a pattern is worth examining. A preliminary evaluation is often closed with no action; an engineering analysis is the stage that usually precedes a recall.

Desiccated Air Bag Inflator Rupture

EA21002

Still open engineering analysis · opened September 17, 2021

the air bags

From 2000 through 2017, Takata produced millions of air bag inflators using two types of phase-stabilized ammonium nitrate ("PSAN") propellant -- propellant 2004 and propellant 2004L. After prolonged exposure to high temperature cycles and humidity, inflators using propellant 2004 can degrade, causing the propellant to burn too quickly when ignited. The rapid burning can cause the inflator to rupture during deployment, potentially causing serious or even fatal injury to vehicle occupants. See 2016 Blomquist Report at www.nhtsa.gov/sites/nhtsa.gov/files/documents/expert_report-hrblomquist.pdf.Consequently, all frontal inflators using propellant 2004 that do not contain a "desiccant" (a substance that traps and holds moisture) in US vehicles are under recall. These "non-desiccated" inflators either have been or are required to be replaced.In some cases, the remedy part for these recalled inflators was, or will be, an inflator using either propellant 2004 or 2004L that does contain a desiccant. None of these "desiccated" remedy parts (which were installed in older model year vehicles) are currently under recall for a degradation concern. Certain subsets of desiccated PSAN inflators using propellant 2004 for use as original equipment, however, have been recalled for a degradation concern. All Takata inflators produced with propellant 2004L contain desiccant, and none of these desiccated inflators using propellant 2004L are under recall for a degradation concern. There have been no reported field ruptures in any non-recalled desiccated PSAN inflators.It is understood that desiccants fully saturate at some threshold, at which point any additional moisture will not be captured. This means the degradation process observed in non-desiccated inflators using propellant 2004 may also occur in non-recalled desiccated inflators using propellant 2004, assuming additional moisture enters the inflator and high temperature cycling occurs. Based on available information, desiccant saturation can occur within the first five years in the worst environments, and the time required for full saturation is affected by multiple factors. While no present safety risk has been identified, further work is needed to evaluate the future risk of non-recalled desiccated inflators using propellant 2004.Three entities -- Takata (now known as TK Global), the Independent Testing Coalition, and Exponent -- have been studying the long-term behavior of Takata desiccated PSAN inflators using propellant 2004L (as well as 2004) in the presence of moisture and temperature cycling. The research efforts, which include development of predictive modeling techniques and field sample analysis, are ongoing. To date, none of the researchers have identified field evidence showing that propellant 2004L is undergoing a degradation process that leads to aggressive deployment and potential rupture. However, the time in service of such inflators remains short compared to that of the inflators using propellant 2004. Further study is needed to assess the long-term safety of desiccated inflators using propellant 2004L.The Office of Defects Investigation is opening this investigation to examine whether a safety defect related to propellant degradation exists in non-recalled desiccated PSAN frontal inflators manufactured by Takata. This investigation will require extensive information on Takata production processes and surveys of inflators in the field. Lists of recall actions that may have used desiccated PSAN inflators as remedy parts, as well as the makes and models originally manufactured with them, is available with the downloadable version of this document (see nhtsa.gov/recalls?nhtsaId=EA21002 -- note this information is subject to change/revision as the investigation proceeds). This investigation does not supersede EA15-001, which remains open.

Front Roof Panel Detachment

PE21001

Closed preliminary evaluation · opened January 8, 2021 · closed October 14, 2021 · led to recall 21V197000

the body structure

On January 8, 2021, after ongoing review with Mercedes Benz, the National Highway Traffic Safety Administration (NHTSA) Office of Defects Investigation (ODI) opened PE21-001 to assess allegations of front roof panel detachments while driving at highway speeds in certain 2015 Mercedes-Benz (Mercedes) C-Class vehicles.The subject front roof panel is a stationary panel composed of polycarbonate and is attached to the vehicle via adhesive at the time of manufacture. The panel is found on subject vehicles equipped with panoramic sunroofs. Over time, the subject panels may exhibit cosmetic degradation leading to replacement of the panel, a procedure which entails: removal of the old panel and adhesive, site preparation, and installation of a replacement panel with new adhesive.The consumer complaints that prompted the opening of PE21-001 all described detachments of front roof panels that had been replaced after the vehicle was put into service.Mercedes' internal investigation identified a broader scope of affected vehicles (2014-2020 CLA, GLA, C, S, GLC, and GLE class) and found the following potential service procedure- related causes of front roof panel detachments:- Improper surface pretreatments such as the use of the wrong primer or cleaner or scoring of the surface; or - Use of the incorrect adhesive.These conditions lead to a front roof panel bond that, even if sound at the time of repair, cannot maintain its strength over time and environmental exposure.Mercedes updated its service and parts ordering systems to reinforce the proper use of specified kits and procedures via webinars, shop foreman meetings, and explicit reference to the risks incurred by diverging from the repair procedures. Mercedes is also furnishing parts ordering assistance, and will hold dealerships accountable for improper repairs.ODI's analysis of the ten complaints it has received from the public (VOQ's) and MBUSA's complaint data submitted in response to the information request letter for PE21-001 identified a total of 57 non-duplicative reports alleging incidents in which the front roof panel detached from the vehicle while in motion. Included within the 57 reports are incidents where consumers state the panel detached ...and flew off into traffic.On March 19, 2021, Mercedes notified NHTSA that it would recall subject vehicles with front roof panels known to have been replaced after the original sale of the vehicle. In total, the recall (designated as Recall 21V197) covers 15,099 vehicles that were ever registered in the United States. Based on Recall 21V197 and the remedy implemented by Mercedes, further investigation does not appear to be warranted at this time.Accordingly, this investigation is closed.The ODI complaints cited above can be viewed at www.nhtsa.gov under the following ODI identification numbers: 11376425, 11352686, 11351629, 11349158, 11341541, 11337594, 11324100, 11311591, 11222127, 11404183

In owners’ own words

Quoted from the complaint file

Quoted from NHTSA's complaint file. These are unverified accounts by the people who filed them, not findings of fault.

STEERING Filed July 8, 2021

1 injured · crash · towed

While driving in a curved onramp connecting from one street to another the vehicle experienced a complete loss of steering ability which resulted in the vehicle continuing to move straight, off the pavement, and into a wall. The vehicle bounced off of the wall and loss of steering ability continued and the vehicle could not be controlled, crossed the road, went over a guardrail, and down an embankment until it came to a stop (approx 100ft). The vehicle engine never turned off until it came to a stop at which point the vehicle was manually turned off. No airbags deployed. There were no warning lights or signals of failing components prior to the loss of steering. An initial review by the

NHTSA complaint 11423998, quoted in part. Filed by an owner and not verified by NHTSA or by us.

TIRES Filed December 29, 2019

crash · 16,000 miles

I WAS DRIVING ON HIGHWAY 1, AT ABOUT 45 MPH, ON MY WAY TO WORK IN A LIGHT RAIN. I MAY HAVE JUST TRANSITIONED INTO THE #1 LANE OF TRAFFIC AS I WAS ABOUT 500 FEET FROM THE RED LEFT TURN SIGNAL LIGHT WHERE I MAKE MY NORMAL TURN. I JUST REMEMBER MY CAR SUDDENLY HYDROPLANED ACROSS THE DOUBLE YELLOW LINE INTO THE ONCOMING LANES OF TRAFFIC AND HITTING THE OPPOSITE SHOULDER OF THE ROAD. MY CAR ENDED UP IN A DITCH. LUCKILY IT HAPPENED AT ABOUT 0630 IN THE MORNING AND NO ONE WAS INJURED AS THIS IS A BUSY ROADWAY. THE TOW TRUCK DRIVER NOTICED THAT THE CENTER TREAD AREA OF MY TIRES WAS BALD, BUT THE OUTER TREAD STILL HAD TREAD ON IT. I BOUGHT MY CAR BRAND NEW 14 MONTHS AGO FROM MERCEDES. ONLY MY WIFE

NHTSA complaint 11291914, quoted in part. Filed by an owner and not verified by NHTSA or by us.

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING Filed May 21, 2024

crash

While I was driving to work in a heavy rain my abs malfunction light came on in my car. I decided to take it to the Mercedes-Benz dealership in Fresno. They said it was the ABS module that needed to be replaced. After being in the shop for almost 3 weeks they said it was fixed. When I went to pick it up, the moment I turned it on the ABS malfunction light came on again. I was told that it was okay to drive and they would have somebody come check it out at my work the next day. My car went back into the shop for another week and they could not figure out what was wrong with it. They did take pictures and the second time I took it in they noticed a bunch of water underneath the floorboard. By

NHTSA complaint 11589822, quoted in part. Filed by an owner and not verified by NHTSA or by us.

STRUCTURE:BODY Filed June 2, 2024

crash

I am wanting to add information to my original complaint. Tracking#11589822 When I called in the electrical issue to AAA the agent said this is a common problem on these cars. Next, I want to add photos the Mercedes of Fresno service department sent me during the 2nd time my car was taken in to be checked. I honestly don't remember off hand when the collision occurred, I have that paper work somewhere. I will find it and send it in also. I will also get paper work from the auto body place that fixed as much of the wiring that it could. There was also a video on line I will try to find again and send that in.

NHTSA complaint 11591967. Filed by an owner and not verified by NHTSA or by us.

STRUCTURE:BODY Filed September 16, 2026

Front roof panel came detached at hwy speed

NHTSA complaint 11764699. Filed by an owner and not verified by NHTSA or by us.

STRUCTURE Filed August 26, 2026

83,000 miles

The contact owns a 2018 Mercedes-Benz C-300. The contact stated that while driving 70 MPH South on the interstate towards Miami, the front panel detached without warning. The contact pulled over to inspect the vehicle and became aware that the panel between the windshield and sunroof had detached. The contact stated that water started entering the vehicle from several areas. The sunroof was inoperable. The contact called the insurance company. The contact associated the failure with NHTSA Campaign Number: 23V854000 (Structure). The local dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was contacted, but no additional assistance was provided. The approximate

NHTSA complaint 11759626, quoted in part. Filed by an owner and not verified by NHTSA or by us.

UNKNOWN OR OTHER Filed June 16, 2026

Transmission failed, yes available for inspection Very bad safety issue Yes it has been confirmed by dealship Yes by the deanship Yes there was warning lamps that appeared in January 2026

NHTSA complaint 11744612. Filed by an owner and not verified by NHTSA or by us.

STRUCTURE Filed March 5, 2026

The contact's wife owns a 2018 Mercedes-Benz C300. The contact stated that while washing the vehicle, a part of the panoramic roof started moving while depressing the glass. The contact stated that there was water leaking into the vehicle from the glass. Upon investigation, the contact discovered NHTSA Campaign Number: 23V854000 (Structure); however, the VIN was not included in the recall. The vehicle was not repaired. The manufacturer was notified of the failure, and a case was filed. The manufacturer confirmed that the VIN was not included in the recall. The contact was then referred to the NHTSA Hotline to report the failure. The failure mileage was unknown.

NHTSA complaint 11722229. Filed by an owner and not verified by NHTSA or by us.

ENGINE Filed January 9, 2026

Check engine light comes on, Error Code P052E, after a lot of research, this is a known defective part by Benz. Huge safety issue not addressed by them. Very costly to fix for a customer. There is a new and improved replacement part from Benz indicating they are aware of the faulty old parts that are currently in those cars but yet they have failed to do a recall.

NHTSA complaint 11709871. Filed by an owner and not verified by NHTSA or by us.

ENGINE Filed October 23, 2025

My vehicle only had 31,000 miles and I experienced engine failure. I bought a new engine for 16, 500. 00 dollars. Mercedes Benz did nothing. I almost got in to several accidents because the engine completely stop on the interstate. Almost got hit by several cars. This is unacceptable.

NHTSA complaint 11695170. Filed by an owner and not verified by NHTSA or by us.

Compare

Other years of the Mercedes-Benz C 300

Model year	Complaints	Recalls	Deaths
2024	11	3	—
2023	22	9	—
2022	25	9	—
2021	14	7	—
2020	33	9	—
2019	69	17	—
2017	216	15	—
2016	286	13	—
2015	381	11	—
2014	94	5	—
2013	260	6	—
2012	266	6	1
2011	480	6	—
2010	453	6	—

Other 2018 Mercedes-Benz models

GLC 300 87 GLA 250 49 CLA 250 40 GLE 350 40 E 300 32 Metris 28 E 400 23 GLS 450 14

Complaints on file, same model year.

Every Mercedes-Benz on this site — 227 vehicles.

If this is your car and a dealer keeps failing to fix it, your state's lemon law may require the manufacturer to replace it or buy it back. How many repair attempts it takes, and how long you have to file, is set by the state you bought in and by nothing on this page.

Where these numbers come from

Complaints: NHTSA's ODI complaint file, published October 2, 2026. One complaint is one ODI number, which is how NHTSA counts them.
Recalls: NHTSA's recall campaign API, newest campaign on this vehicle filed December 15, 2023.
Investigations: NHTSA's ODI investigation file, published October 2, 2026.

A complaint is one owner's account and has not been verified by NHTSA or by us. A vehicle with more complaints is not necessarily worse: models that sold in larger numbers collect more of them. How this is counted.

Compiled and maintained by guarledes
Independent developer and analyst