2019 Mercedes-Benz C-Class

On certain vehicles equipped with an Audio 20 head unit and automatic child seat recognition, the status of the passenger airbag may not be displayed correctly. For example, the display may indicate that an airbag is turned off when it is not. This could create a situation where a child or small-statured occupant is inadvertently placed in front of an active airbag. This could increase the risk of injury in a crash. Correction: Dealers will update the audio head unit software.

On certain C 300 and AMG C 43 vehicles, a software problem could cause a situation where the parking brake cannot be deactivated. In other instances, the parking brake may be deactivated by the owner, however the vehicle can only be driven without Electronic Stability Program (ESP) functionality, increasing the risk of a crash causing injury and/or damage to property. Correction: Dealers will update the ESP software. Note: This condition could result in the illumination of the brake warning light and the appearance of a warning message on the instrument cluster.

Issue: On certain vehicles with a 4-cylinder engine, the wrong bolts were used on the turbocharger oil return line and crank case ventilation line. This could cause an oil leak at the turbocharger oil return line. Safety Risk: An oil leak onto hot engine parts could create the risk of a fire. Corrective Actions: The company will notify owners by mail and instruct them to take their vehicle to a dealer to replace the mounting bolts for the turbocharger oil return line and crank case ventilation line.

Issue: On one vehicle, the engine crankshaft may have surface damage. Under high loads, the crankshaft may weaken and cause a sudden engine failure. Safety Risk: An engine failure could increase the risk of a crash. Corrective Actions: The company will notify the owner by mail and instruct them to take their vehicle to a dealer to inspect the crankshaft. It will be replaced if necessary.

Issue: On certain vehicles, the 12-volt starter battery may not be properly secured by its mounting bracket. In a crash, the battery may shift and the terminals might disconnect. This could interrupt power to the vehicle, which would affect multiple post-crash systems. It is also possible that the battery could detach from the vehicle. Note: A loose battery could cause rattling or knocking noises from the engine compartment while driving. Safety Risk: A failure of the post-crash systems could increase the risk of injury. A battery that detaches from the vehicle could create a road hazard for others and increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct them to take their vehicle to a dealer to replace the battery mounting bracket.

Issue: On certain vehicles, the driver-front airbag module may not be properly attached. This could cause the airbag module to separate from its mount in a crash. Safety Risk: An airbag that separates from its mount may not function correctly and could create an increased risk of injury in a crash. Corrective Action: Owners will be notified by mail and instructed to take their vehicle to a dealer to inspect and replace the driver-front airbag module, as required.

Issue: On certain vehicles, there may be a problem with the front seat belt buckles. This could cause the seat belt warnings to turn on, even if the front seat belts are buckled. If the driver ignores these warnings, the PRE-SAFE and airbag systems may not function properly. Safety Risk: A seat belt pretensioner or airbag system that does not work properly in a crash could increase the risk of injury. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to check the front seat belt buckles and replace them if necessary.

Issue: On certain vehicles, the airbag warning label(s) on the passenger side sun visor may be in an incorrect language. Safety Risk: Incorrect airbag warning labels could cause confusion. This could lead to an increased risk of injury in a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to inspect, and if necessary, replace the sun visor and warning label(s).

Issue: On certain vehicles, the screws that attach the oil lines to the turbocharger may not have been properly tightened. If the screws are not properly tightened, oil could leak onto hot surfaces in the engine bay. Safety Risk: Engine oil that leaks onto a hot surface could cause a fire. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to inspect and repair the turbocharger oil feed and return line mounting, as necessary.

Issue: On certain vehicles, the software for the electronic stability control system (ESP) was not programmed correctly. As a result, the ESP system may not function as intended in certain driving situations. Safety Risk: A stability control system that does not work properly could increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to update the software for the ESP system.

Issue: On certain vehicles, the power supply cable to the starter may have been attached incorrectly. As a result, the power cable could contact the starter housing. This can damage the cable, and could result in a short circuit. Safety Risk: A short circuit could cause the vehicle to stall and create the risk of a fire. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to check the cable connections to the starter and correct them, if necessary.

Issue: On certain vehicles, a software problem could cause the rearview camera image not to appear on the central display. Canadian regulations require the rearview image to display when the transmission is shifted into reverse gear. Safety Risk: A rearview camera image that does not display could reduce a driver's ability to see behind the vehicle while backing up. This could increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to update the head unit software.

Issue: On certain C-Class cabriolet models equipped with the PRE-SAFE system, the front seat belts may not retract completely to their storage position. Canadian regulations require seat belts to retract fully when not in use. Safety Risk: If the seat belt does not fully retract, the occupant may find the operation of the seat belt inconvenient and not wear it. This could increase the risk of injury in a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to inspect the function of the front seat belt retractors and adjust the dampening foam, if necessary.

Issue: On certain vehicles equipped with the emergency calling (eCall) system, the communications module may temporarily lose power during a crash. If this happens, the wrong vehicle location may be transmitted through the eCall system. This could cause emergency responders to be sent to the wrong location. Safety Risk: If the eCall system sends out the wrong location after a crash, there could be a delay in response from emergency services. Corrective Actions: Mercedes-Benz will notify owners by mail and send a wireless over-the-air update to each vehicle. If the update cannot be completed successfully, you will be notified to schedule an appointment to have the update performed by a dealer.

Issue: On certain vehicles equipped with the emergency calling (eCall) system, the communications module could be deactivated. As a result, the eCall may not work properly when there is a crash or when the SOS button is pressed. Safety Risk: If the eCall system does not work in an emergency situation, there could be a delay in response from emergency services. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to inspect the communication module and verify that it is properly activated.

Issue: On certain vehicles, the plastic panel located between the windshield and the panoramic sunroof may not have been attached correctly during a prior service repair. Over time, the panel could loosen and separate from the vehicle. Safety Risk: A panel that detaches from a moving vehicle could create a road hazard for others and increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to replace the front roof panel.

Issue: On certain vehicles, a software problem could cause the rearview camera image not to appear on the central display. Canadian regulations require the rearview image to display when the transmission is shifted into reverse gear. Safety Risk: A rearview camera image that does not display could reduce a driver's ability to see behind the vehicle while backing up. This could increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and send a wireless over-the-air software update to each vehicle. If the update cannot be completed successfully, you will be notified to schedule an appointment to have the update performed by a dealer.

Issue: On certain vehicles, a label on the headlamp assembly may contain incorrect information for a service technician. As a result, the headlamps may not get adjusted correctly after a repair. This could cause glare and/or confusion for oncoming drivers. Note: This recall only affects certain vehicles equipped with LED headlamps. Safety Risk: Headlamps that cause glare or confusion for oncoming drivers could increase the risk of a crash. Corrective Action: Mercedez-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to replace the headlamps.

Issue: On certain vehicles, small particles could damage the seals between the fuel rail and fuel injectors. If this happens, there could be a fuel leak in the engine compartment. Safety Risk: A fuel leak can create the risk of a fire. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealer to replace the fuel rail and fuel injectors.

Issue: On certain vehicles, a software problem could cause the rearview camera image not to appear on the central display. Canadian regulations require the rearview image to display when the transmission is shifted into reverse gear. Safety Risk: A rearview camera image that does not display could reduce a driver's ability to see behind the vehicle while backing up. This could increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and instruct you to take your vehicle to a dealership to update the rearview camera software.

Issue: On certain vehicles equipped with the emergency calling (eCall) system, the SIM card for the communications module could disable itself. If this happens, the eCall system would not work properly when there is a crash or when the SOS button is pressed. Safety Risk: If the eCall system does not work in an emergency situation, there could be a delay in response from emergency services. Corrective Actions: Mercedes-Benz will notify owners by mail and send a wireless over-the-air software update to each vehicle. If the update cannot be completed successfully, you will be notified to schedule an appointment to have the update performed by a dealer.

Issue: On certain vehicles, the plastic panel located between the windshield and the panoramic sunroof may not have been attached correctly during a prior service repair. Over time, the panel could loosen and separate from the vehicle. Note: This is an expansion of Transport Canada recall 2021-170. Safety Risk: A panel that detaches from a moving vehicle could create a road hazard for others and increase the risk of a crash. Corrective Actions: Mercedes-Benz will notify owners by mail and advise you to take your vehicle to a dealership to replace the front roof panel.