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NHTSA-Verified · Common Problems

2018 Mercedes Benz Glc Class Coupe
Common Problems

Ranked from 42 federal NHTSA complaints. Every problem links to the complaint IDs behind it.

4
High severity
3
Medium
1
Low

8 Common Problems

Ordered by how often owners reported each one to NHTSA. The bar shows how common a problem is relative to the most-reported on this vehicle. Expand any problem to see the federal complaint IDs.

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  1. 1

    Engine Crankcase Ventilation Valve Malfunction

    13complaints
    High severityEngine

    The crankcase ventilation valve malfunctions leading to engine light on and check engine codes.

  2. 2

    Air Bag Malfunction

    7complaints
    High severityElectrical

    Air bags deploy unexpectedly or fail to deploy when needed, increasing crash risk.

  3. 3

    Transmission Shifting Issues

    7complaints
    Medium severityTransmission

    Transmission shifts into neutral unexpectedly and fails to return to drive, causing loss of control.

    $200–$2,500est. drivetrain diagnosis + repair · 1–8 hrs labor
    Get local quotes
  4. 4

    Seat Belt Latch Plate Retraction

    6complaints
    Medium severityOther

    The seat belt latch plate retracts into the interior panel, preventing proper seat belt usage.

  5. 5

    Brake Squeaking and Grinding Noise

    4complaints
    Low severityBrakes

    The brakes squeak and grind, especially when braking or changing gears.

    $150–$1,000est. brake system diagnosis + repair · 1–4 hrs labor
    Get local quotes
  6. 6

    Electrical System Issues

    4complaints
    Medium severityElectrical

    Infotainment display malfunctions, backup camera malfunctions, and other electrical system failures.

  7. 7

    Sunroof Explosion During Operation

    2complaints
    High severityOther

    The panoramic sunroof suddenly explodes during operation, posing a safety hazard.

  8. 8

    Sunroof Malfunction

    2complaints
    High severityOther

    Panoramic sunroof detaches or explodes while driving, posing a safety risk.

Other years & sources

2017 Mercedes Benz Glc Class CoupeAll NHTSA complaints for this vehicle →

Data source: U.S. National Highway Traffic Safety Administration (NHTSA) owner complaints and recalls. Problems are clustered and ranked from the complaint record; occurrence counts reflect corroborating complaints, not total incidence. Vehicle image is illustrative. Repair-cost figures are typical U.S. independent-shop ranges (parts + labor) for the class of repair shown — actual quotes vary by region, engine, and diagnosis; always confirm with a local shop.