NHTSA (USA)Medium Risk
At a glance
This page covers 12 recalls and 46 owner complaints for the 2019 Mercedes-Benz Glc 300.
Engine and structural complaints dominate what owners report for the 2019 GLC 300. On the engine side, owners describe sudden loss of power while driving at highway speeds, with the vehicle failing to accelerate or maintain speed, in some cases stalling in active traffic. The electrical system draws a second cluster of complaints, including warning messages about the passenger airbag and a seatbelt that owners report getting stuck and failing to release. The structural complaints center almost entirely on the sunroof: multiple owners report the panoramic glass shattering or exploding spontaneously while driving at highway speeds, with no prior warning and no apparent impact. Owners consistently describe the event as sudden and startling, occurring on clear days with no debris or other vehicles nearby.
46
Total Complaints
4
Crash-Related
2
Fire-Related
3
With Injuries
By System
The 2019 Mercedes-Benz GLC 300 has 12 recalls, the most serious involving a roof panel that can detach from the vehicle and a fuel injector leak that can cause an engine fire.
The roof panel issue spans two recalls: the front panel's adhesive can deteriorate and the panel can break free, becoming a road hazard, and a prior repair attempt may not have correctly rebonded the panel, leaving the same detachment risk. On the fuel side, a leak near hot engine or exhaust components raises the risk of fire. Two separate steering recalls affect this vehicle: an internal sensor failure and a faulty electrical connection between the power steering motor and its control unit can each cut power steering assist, requiring significantly more physical effort to steer. The seatbelt pretensioners and the pre-crash tensioning system may also fail to activate in a crash, reducing occupant protection. Three recalls cover the automatic emergency call system, which can fail to connect to emergency services or transmit the wrong location after a crash. The headlights may be aimed too high, creating glare for oncoming drivers. A passenger seat sensor may incorrectly show the front airbag as active when it will not deploy, leaving a passenger unaware they are unprotected. There is also a label recall: the airbag warning on the passenger sun visor may be printed in a foreign language, making the child safety information unreadable for most owners.
At a glance
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
What can fail
Headlights may be aimed too high, creating glare for drivers in oncoming vehicles.
What the fix does
Dealer will inspect and adjust headlight aim as needed at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The front roof panel between the windshield and panoramic sunroof may have been improperly bonded during a prior repair, causing the panel to detach from the vehicle.
What the fix does
Dealers will replace the front roof panel at no charge to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
A software error in the communication module's SIM card can prevent mobile network connection, which disables the emergency call (eCall) system.
What the fix does
The communication module software will be updated at no cost through an over-the-air update or by a dealer.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
Manufacturing debris may be trapped between the fuel rail and injectors, potentially causing fuel to leak.
What the fix does
Dealers will replace the fuel rail and fuel injectors at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The front roof panel between the windshield and panoramic sunroof may not be properly bonded to the vehicle from a previous repair, risking separation.
What the fix does
The dealer will remove and replace the front roof panel using proper bonding materials and procedures at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The communication module may have been turned off during service, disabling the Emergency Call function that connects your vehicle to emergency services.
What the fix does
Dealers will inspect the communication module and reactivate it if needed, at no cost to you.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The communication module software may fail to send your vehicle's correct location to emergency services when the eCall system activates during a crash.
What the fix does
A dealer will update the communication module software, or the update will be sent over-the-air, at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The passenger side sun visor has air bag warning labels printed in a foreign language instead of English, failing to meet federal safety labeling requirements.
What the fix does
Dealers will inspect the air bag warnings on the sun visor and replace them with correct English labels at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The electrical connection between the power steering motor and its control unit may fail, causing loss of electric power steering assist.
What the fix does
Dealers will replace the electric power steering control unit at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
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.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
A sensor inside the electric power steering unit may fail, which would shut off the power steering assist.
What the fix does
Dealers will replace the steering unit at no cost to you.
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.