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NHTSA-Verified · Common Problems

2017 Mercedes Benz C Class
Common Problems

Ranked from 101 federal NHTSA complaints. Every problem links to the complaint IDs behind it.

5
High severity
2
Medium

7 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 Code P052E

    34complaints
    High severityEngine

    The engine code P052E indicates a malfunction in the positive crankcase ventilation system.

  2. 2

    Check Engine Light Due to Positive Crankcase Ventilation (PCV) Issues

    33complaints
    High severityEngine

    Multiple instances of the check engine light being triggered by PCV valve malfunctions, often requiring expensive repairs.

    $100–$250est. professional diagnosis · 1–2 hrs labor
    Get local quotes
  3. 3

    Engine Stall Due to Crankcase Ventilation Valve Failure

    20complaints
    High severityEngine

    The crankcase ventilation valve (P052E) frequently malfunctions, causing engine stalls and misfires.

    $150–$1,200est. stalling / shutdown diagnosis + repair · 1–5 hrs labor
    Get local quotes
  4. 4

    Sunroof Detachment

    18complaints
    High severityOther

    Panoramic sunroof detaching unexpectedly during operation, posing a safety risk and potential injury.

  5. 5

    Seat Belt Retraction Issues

    12complaints
    Medium severityOther

    Front seat belts fail to retract properly, posing a safety risk during sudden stops or collisions.

  6. 6

    Fuel System Leaks and Gas Smell

    11complaints
    High severityFuel system

    Fuel system leaks causing strong gasoline odors inside the cabin, potentially leading to fire hazards.

  7. 7

    Panoramic Sunroof Malfunction

    6complaints
    Medium severityOther

    Issues with the panoramic sunroof not closing properly or detaching unexpectedly during operation, posing a safety risk.

Other years & sources

2010 Mercedes Benz C Class2016 Mercedes Benz C Class2018 Mercedes Benz C ClassAll 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.