The 2018 Mercedes-Benz AMG GLC63S has 3 recalls, with the two most serious involving crash protection: the front passenger airbag can deploy late in a collision, and the seatbelt pretensioners along with the PRE-SAFE system may fail to activate at all.
The delayed airbag deployment affects unbelted front seat passengers specifically, meaning the bag may not reach full inflation at the moment of impact when it is needed most. The pretensioner issue is separate: in a crash, the system that cinches the seatbelt tight against the occupant and the preparatory tensioning that PRE-SAFE triggers before impact may both fail to fire, leaving the occupant with a slack belt and no pre-bracing. There is also a concern with the passenger seat occupancy sensor, which can misread the seat status and display the passenger airbag as active when it is actually switched off, giving the front passenger a false sense of protection if the seat is occupied.
At a glance
What can fail
The front seat belt buckles may be incorrectly detected as unfastened even when properly fastened, which can disable the PRE-SAFE® function and pretensioner.
What the fix does
Dealers will inspect and replace front seat belt buckles as needed at no cost.
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Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
In a crash, the front air bags may deploy too slowly for unbelted front-seat passengers, reducing protection.
What the fix does
Dealers will update the air bag control unit software to correct deployment timing at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The passenger side air bag status may not display correctly on the instrument cluster in certain 2018-2019 C-Class and GLC-Class vehicles with Audio 20 head units.
What the fix does
Dealers will update the audio head unit software at no cost to correct the air bag status display.
Summarized — see the official notice for exact wording, dates, and contacts.
