repaired · 2025 Q4
Body: roof and pillars
Risk. A detached roof panel can become a road hazard, increasing the risk of a crash.
2018 Mercedes-Benz GLC 300Problems, recalls & complaints
NHTSA has logged 87 owner complaints about the 2018 Mercedes-Benz GLC 300, most often about the engine. It is covered by 12 safety recalls, and for recall 23V-854 the manufacturer reports only 41% of affected cars repaired.
Source: NHTSA complaints, recalls, investigations and manufacturer recall reports, through July 30, 2026. Updated daily.
Complaints by system
Where the 2018 Mercedes-Benz GLC 300 has problems
87 complaints grouped by the system owners reported.
28Engine1 crash/fire/injury
13Electrical system2 crash/fire/injury
9Structure2 crash/fire/injury
8Seat belts
8Power train1 crash/fire/injury
7Fuel/propulsion system
6Air bags
5Service brakes
3Steering
1611 other systems2 crash/fire/injury
| System | Complaints | Crash, fire or injury |
|---|---|---|
| Engine | 28 | 1 |
| Electrical system | 13 | 2 |
| Structure | 9 | 2 |
| Seat belts | 8 | 0 |
| Power train | 8 | 1 |
| Fuel/propulsion system | 7 | 0 |
| Air bags | 6 | 1 |
| Service brakes | 5 | 1 |
| Steering | 3 | 0 |
| 11 other systems | 16 | 2 |
Source: NHTSA Office of Defects Investigation. Complaints are submitted by the public and are not verified by NHTSA.
12 recalls
2018 Mercedes-Benz GLC 300 recalls and how many were fixed
Each ring shows the share of affected cars repaired, from the manufacturer’s latest quarterly report to NHTSA. Recall repairs are free at authorized dealers.
repaired · 2026 Q2
Communication: auto crash notification
Risk. A disabled eCall system would prevent a vehicle occupant from contacting the emergency services call center in an emergency, potentially delaying emergency…
repaired · 2023 Q3
Body: roof and pillars
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…
repaired · 2023 Q3
Communication
Risk. A disabled eCall system would prevent a vehicle occupant from contacting emergency services through the call center in an emergency, potentially delaying…
Show 8 more recalls
repaired · 2023 Q4
Communication: auto crash notification
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.
repaired · 2020 Q2
Sensor: occupant classification
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…
repaired · 2020 Q1
Rear/other: buckle assembly
Risk. If the rear seat passengers cannot fasten their seat belts, they have an increased risk of injury in the event of a crash.
repaired · 2020 Q1
Exterior lighting: turn signal
Risk. Turn signals that are the wrong color may not be as easily recognized by other drivers, increasing the risk of a crash.
repaired · 2019 Q3
Driver side: inflator module
Risk. In the event of a crash involving driver air bag deployment, an improperly inflated air bag and/or an inflator rupture with sharp metal fragments might result…
repaired · 2019 Q3
Rear/other: buckle assembly
Risk. If the rear seat passengers cannot fasten their seat belts, they have an increased risk of injury in the event of a crash.
repaired · 2019 Q1
Visibility: sun/moon roof assembly
Risk. If the sun roof panels detach from the vehicle, it can increase the risk of a crash or injury for following traffic.
repaired · 2019 Q4
Air bags: frontal
Risk. If the driver air bag inadvertently deploys, it can increase the risk of injury and a crash.
Recalls apply to specific cars. To see whether a recall is still open on yours, enter the 17-character VIN at nhtsa.gov/recalls or with Mercedes-Benz.
Best & worst years
2018 vs. every other GLC 300 year
Bars show complaints per model year. Colors show the CarFlaw verdict: complaints weighted for crashes, fires and injuries, adjusted for years on the road and compared with the GLC 300 median. How we score
'16'17'18'19'20'21'22'23'24'25'26
- Avoid
- Caution
- Solid
- Best
- Not rated
2 investigations
NHTSA defect investigations
Federal investigations that included the 2018 Mercedes-Benz GLC 300, and the recalls they led to.
- Desiccated Air Bag Inflator RuptureOpen
- Front Roof Panel DetachmentLed to recall 21V-197
In owners' words
What GLC 300 owners report
Recent engine complaints filed with NHTSA, shortened. Personal details are removed.
Error code P052E71 on a 2018 Mercedes-Benz GLC 300 4MATIC means the Positive Crankcase Ventilation (PCV) Regulator Valve Performance has a malfunction, specifically that the partial-load ventilation valve actuator is blocked. By research, i found that this is a very common problem on those engines,…
Component Failure: The vehicle is equipped with the M274 2.0L turbocharged engine, which suffered a major internal mechanical defect. An authorized Mercedes-Benz dealership diagnosed the vehicle at 79,504 miles with a malfunction in the crankcase ventilation system alongside severe internal…
I had the engine light come on and took it to the dealership. They quoted me over 8 thousand dollars to fix. I took it to a repair shop that works on luxury cars and they fixed it for less than 1000 dollars. I had to have the transducer fixed in the turbo in my engine and when they did that they…
Own a 2018 GLC 300?
Decode your VIN to see the recalls for your exact car, then confirm open recalls with NHTSA.