2018 Mercedes-benz C300 problems

General information about Mercedes-benz-C300
Overview of popular issues
Recalls list

The Mercedes-Benz C-Class is a series of compact executive cars produced by Mercedes-Benz Group AG. Introduced in 1993 as a replacement for the 190 (W201) range, the C-Class was the smallest model in the marque's line-up until the W168 A-Class arrived in 1997. The C-Class has been available with a "4MATIC" four-wheel drive option since 2002. The third generation (W204) was launched in 2007 while the current W206 generation was launched in 2021.

Initially available in sedan and a station wagon configurations, a fastback coupé (SportCoupé) variant followed and was later renamed to Mercedes-Benz CLC-Class. It remained in production until 2011 when a new W204 C-Class coupé replaced it for the 2012 model year.

First generation (W202; 1993)

In October 1986, three years into Mercedes-Benz 190 (W201)'s production run, work began on a successor. Design work began in 1987, with the final design by Murat Günak selected in 1989 and the production design by Olivier Boulay delayed in January 1990, finally being patented on 19 December 1990. Rough prototypes went into testing in 1989, with first production design prototypes commencing trial in 1990. In May 1993, the first generation W202 C-Class was introduced as a replacement for the 190. The first C-Class (W202) sedan was manufactured on 1 June 1993. The C-Class sedan was the company's entry-level model up until 1997 when Mercedes launched the A-Class. Styling themes were carried over from the previous W201 series, but the new series had a smoother and rounder design than the last generation of compact Mercedes, with styling cues from the W124 E-Class (short, high trunk and taller tail lights), W140 S-Class (front end), and R129 SL-Class (headlights).

During the 1996 and 1997 Formula 1 season, the C36 AMG served as the sport's Safety Car.

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Common 2018 Mercedes-benz C300 problems

The Mercedes-Benz C300, specifically the 2018 model, has been reported to have several common problems based on complaints from owners. The most significant issue appears to be engine problems, which have been the worst problem category for the Mercedes-Benz C300 across all model years.

One of the most frequently reported problems is engine failure, which is the worst problem for the 2016 Mercedes-Benz C300. The average cost to fix this issue is $15,600, with an average mileage of 48,000 miles. This issue is particularly concerning because it can lead to catastrophic engine failure, which can be costly to repair.

Another common problem with the 2015 Mercedes-Benz C300 is a broken piston, which has an average cost to fix of $6,500 and an average mileage of 52,000 miles. This issue can also lead to significant engine damage and can be expensive to repair.

Engine knocking is another common problem with the 2015 Mercedes-Benz C300. The average cost to fix this issue is $14,000, with an average mileage of 46,000 miles. This issue can be caused by several factors, including engine wear, fuel quality, and ignition system problems.

In addition to engine problems, the 2018 Mercedes-Benz C300 has also been reported to have issues with the seatbelt buckles. The switches used in the seatbelt buckles of some examples made between 1 June 2018 and 31 October 2018 could be faulty. Check with a Mercedes dealer to find out if this applies to your car because they'll need to fit new buckles if it does.

Another issue reported with the 2018 Mercedes-Benz C300 is the incorrect engine undertray. The wrong engine undertray was fitted to some C-Class' built between 1 March 2018 and 31 March 2018, but this can easily be rectified by a Mercedes dealer who will check and replace it if necessary.

The 2018 Mercedes-Benz C300 has also been reported to have issues with the front seat frame. The welds on the seat frames of the front AMG performance seats fitted to cars manufactured from 8 June 2017 and 2 June 2018 could fail during a collision. Find out from a Mercedes dealer if your car is affected because they will need to inspect the seats and repair them if found to be faulty.

Overall, the 2018 Mercedes-Benz C300 has several common problems, with engine issues being the most significant. These problems can be costly to repair and can lead to significant engine damage. It is essential to address these issues promptly to avoid further damage and to ensure the safety of the vehicle.

What is the common problem with Mercedes C300?

Mercedes-Benz C 300 Power Steering Malfunction

Over time, this operation can get damaged due to power steering fluid leaks and power steering belt damage. The most common issues to look for when diagnosing a power steering malfunction in your C 300 are: Power Steering Fluid Leaks. Noises When Turning the Steering Wheel.

Is the 2018 Mercedes C300 reliable?

How Reliable Is the 2018 Mercedes-Benz C-Class? The 2018 Mercedes-Benz C-Class has a below-average predicted reliability rating of 2.5 out of five from J.D. Power.

Are Mercedes C300 expensive to fix?

What Are the Maintenance Costs for a Mercedes-Benz C 300? According to Edmunds True Cost to Own, a Mercedes-Benz C-Class costs roughly $7,786 in maintenance over a five-year period; here we are focusing on C 300 maintenance costs specifically. Repairs total in at about $3,007—also over a five-year period.

How many miles will a 2018 Mercedes C300 last?

The 2018 Mercedes C-Class lasts around 200,000 miles with some steering vibration and sunroof issues reported. At $24,150 to $68,495, it's expensive, but worth the money if you're looking for a small luxury car with some powerful engine choices.

What is the common problem with Mercedes C300?

Mercedes-Benz C 300 Power Steering Malfunction

Is the 2018 Mercedes C300 reliable?

How Reliable Is the 2018 Mercedes-Benz C-Class? The 2018 Mercedes-Benz C-Class has a below-average predicted reliability rating of 2.5 out of five from J.D. Power.

Is Mercedes C300 expensive to maintain?

How many miles will a 2018 Mercedes C300 last?

2018 Mercedes-benz C300 complaints

The NHTSA has received 0 complaints about various vehicle components related to the 2018 Mercedes-benz C300.

You can leave your car complaint via the special form below.

2018 Mercedes-benz C300 recalls

The National Highway Traffic Safety Administration (NHTSA) has issued 18 recalls for different components of the 2018 Mercedes-benz C300.

2023-12-15

Manufacturer: Mercedes-Benz USA, LLC
Components: STRUCTURE:BODY:ROOF AND PILLARS
Summary: 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.
Consequence: A detached roof panel can become a road hazard, increasing the risk of a crash.
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.

2022-05-20

Manufacturer: Mercedes-Benz USA, LLC
Components: ELECTRICAL SYSTEM:SOFTWARE
Summary: 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.
Consequence: 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.

2021-07-02

Manufacturer: Mercedes-Benz USA, LLC
Components: EXTERIOR LIGHTING:HEADLIGHTS
Summary: 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."
Consequence: Incorrectly adjusted headlights may reduce visibility, increasing the risk of a crash.
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.

2021-03-19

Manufacturer: Mercedes-Benz USA, LLC
Components: STRUCTURE:BODY:ROOF AND PILLARS
Summary: 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.
Consequence: 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.
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.

2021-02-12

Manufacturer: Mercedes-Benz USA, LLC
Components: COMMUNICATION
Summary: 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.
Consequence: 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.
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.

2021-02-05

Manufacturer: Mercedes-Benz USA, LLC
Components: ELECTRICAL SYSTEM:SOFTWARE
Summary: 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.
Consequence: 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.

2021-01-29

Manufacturer: Mercedes-Benz USA, LLC
Components: SEAT BELTS:FRONT:RETRACTOR
Summary: 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."
Consequence: 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.

2019-08-09

Manufacturer: Mercedes-Benz USA, LLC.
Components: ELECTRICAL SYSTEM:12V/24V/48V BATTERY
Summary: 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.
Consequence: 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.
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.

2019-02-26

Manufacturer: Mercedes-Benz USA, LLC.
Components: SEATS
Summary: 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.
Consequence: If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
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.

2018-12-19

Manufacturer: Mercedes-Benz USA, LLC.
Components: EXTERIOR LIGHTING:HEADLIGHTS
Summary: 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."
Consequence: If the low beam headlight is not properly adjusted, the driver may have reduced visibility, increasing the risk of a crash.
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.

2018-12-07

Manufacturer: Mercedes-Benz USA, LLC.
Components: STEERING
Summary: 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.
Consequence: 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.
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.

2018-11-29

Manufacturer: Mercedes-Benz USA, LLC.
Components: STEERING:RACK AND PINION:RACK
Summary: 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.
Consequence: A car that cannot be properly steered has an increased risk of a crash.
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.

2018-11-27

Manufacturer: Mercedes-Benz USA, LLC.
Components: AIR BAGS:SENSOR:OCCUPANT CLASSIFICATION
Summary: 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.
Consequence: 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.
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.

2018-10-15

Manufacturer: Mercedes-Benz USA, LLC.
Components: ELECTRICAL SYSTEM:12V/24V/48V BATTERY:CABLES
Summary: 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.
Consequence: 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.
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.

2018-09-11

Manufacturer: Mercedes-Benz USA, LLC.
Components: VISIBILITY:GLASS, SIDE/REAR
Summary: 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.
Consequence: If the window detaches from the vehicle, it can become a road hazard, increasing the risk of a crash.
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.

2018-07-10

Manufacturer: Mercedes-Benz USA, LLC.
Components: STRUCTURE:BODY
Summary: 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.
Consequence: If the beltline trim were to separate from the vehicle while driving, it could become a road hazard, increasing the risk of a crash.
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.

2018-03-29

Manufacturer: Mercedes-Benz USA, LLC.
Components: SEATS
Summary: 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.
Consequence: If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
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.

2017-10-06

Manufacturer: Mercedes-Benz USA, LLC.
Components: AIR BAGS:FRONTAL
Summary: 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.
Consequence: If the driver air bag inadvertently deploys, it can increase the risk of injury and a crash.
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.

Additional sources

More sources of information about 2018 Mercedes-benz C300 problems:

Why You Should Avoid the 2015 - 2018 Mercedes Benz C300 ...

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Thinking of buying a 2018 Mercedes C300 - MBWorld.org Forums

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2018 C300 worth ? : r/mercedes

https://www.reddit.com/r/mercedes/comments/x9iv98/2018_c300_worth/

Sep 9, 2022 ... During my ownership, my C300 had an engine mount failure, a fuel pump leak, and interior component creaking/rattling. Most issues surfaced after ...