2018 Mercedes-Benz GLC Reliability Report

The transmission drops into Neutral while driving and sometimes refuses to re-engage, stranding the car in traffic. Code P073E, limp mode, loud bangs, shaking, and stalling recur across reports. Attempted fixes range from software updates to a valve body or a new transmission control unit, without clear success. The electronic column shifter also draws complaints about not registering Park, and one crash followed the car rolling back on an incline. A GLC43 AMG suffered torque converter damage at 44,000 miles.

Rear outboard latch plates slip into the side paneling, often after the rear seats are folded and raised, leaving the belts unusable. Recall 18V177000 covers this defect, but several owners say dealers found their VIN excluded, and one reports recall parts were unavailable. The driver's belt warning also chimes as if unbuckled when it is latched. Dealers have had trouble reproducing this intermittent fault. Some owners also report a rear belt that occasionally will not latch.

The panoramic sunroof glass explodes at highway speed with nothing hitting it, and this is the most common complaint in this category. Roof trim and the glass panel ahead of the sunroof also separate and fly off on the interstate. That endangers cars behind and leaves the roof unsealed against water. A power liftgate that slams shut on its own struck two people on the head, and a dealer called for a new liftgate motor. One fire report describes flames starting in the wheel well after a run-flat tire puncture.

Clock spring failures dominate. The airbag warning light comes on, the horn quits, and the steering column rattles in turns, at roughly 60,000 to 72,000 miles. One owner was told the VIN was left out of the related recall. A defective airbag control unit appears at about 57,000 miles. There are two injury reports. In one, the steering wheel airbag deployed without cause while the driver was backing out of a driveway. In the other, a knee airbag caused a severe shin wound in a minor deer strike.

The brakes squeal, screech, or grind at low speed, especially in reverse, on cold mornings, and after snow. The noise returns after pad replacements. Dealers have suggested hard braking to clear it, but that gives no lasting fix. Some owners paid for new pads themselves after warranty claims were denied. None of these reports describe reduced stopping power. The burden is noise and repeat dealer visits.

The P052E crankcase ventilation code shows up again here, once failing at 58k miles. A fuel pressure sensor or wiring fault makes the fuel door stick shut or pop open on its own. One dealer quoted $5081 to fix it on a car with less than 20,000 miles. The engine can also die when pulling away after an auto stop-start event at a light, taking three attempts to restart. That leaves the car stalled in traffic.

Power assist quits or the wheel becomes hard to turn, with a warning light on the dash. Dealers have diagnosed a faulty electronic power steering module around 70,000 miles. Another car had a failed clock spring and needed a new steering module near 62,700 miles, after a loud clank and an airbag warning. An early failure at about 8,000 miles was fixed with a software update. Sudden loss of assist makes the car hard to control.