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NHTSA-Verified · Common Problems

2018 Mercedes Benz C Class
Common Problems

Ranked from 63 federal NHTSA complaints. Every problem links to the complaint IDs behind it.

5
High severity
6
Medium
2
Low

13 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

    Positive Crankcase Ventilation (PCV) Valve Failure

    17complaints
    High severityEngine

    The PCV valve repeatedly fails, leading to engine light activation and requiring expensive repairs.

  2. 2

    Check Engine Light Activation Due to Electrical System Issues

    11complaints
    Medium severityElectrical

    The check engine light frequently activates due to various electrical system failures, often requiring expensive repairs.

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

    Panoramic Sunroof Malfunction

    9complaints
    Medium severityOther

    Sunroof fails to close properly without warning lights.

  4. 4

    Recall Issues with Steering and Air Bags

    8complaints
    Medium severityOther

    Mercedes-Benz has exceeded reasonable time frames for recall repairs related to steering and air bags.

  5. 5

    Front Roof Panel Detachment

    4complaints
    High severityOther

    Front roof panel detaches unexpectedly, causing safety concerns and vehicle malfunction.

  6. 6

    Tire Blowouts and Shredding

    4complaints
    Medium severityOther

    Multiple tire blowouts and shreds have occurred within a short period of ownership.

  7. 7

    Steering Failure During Sharp Turns

    3complaints
    High severitySteering

    The steering system fails during sharp turns, resulting in loss of control and potential accidents.

  8. 8

    Air Bag Recall Issues

    2complaints
    Medium severityElectrical

    Issues with TAKATA air bags, including delayed repair times and non-functioning warning indicators.

  9. 9

    Engine Light On Due to Cylinder Damage

    2complaints
    High severityEngine

    The engine light frequently activates due to cylinder damage, potentially leading to engine failure.

  10. 10

    Engine Stall at Idle Due to Stop-Start System Failure

    2complaints
    Medium severityEngine

    The engine frequently stalls at idle, especially when the car is stopped for extended periods.

    $150–$900est. stop-start system diagnosis · 1–4 hrs labor
    Get local quotes
  11. 11

    Rearview Camera Malfunction

    2complaints
    Low severityElectrical

    Rearview camera does not display images, posing safety risks during reversing.

    $250–$800est. backup camera replacement · 1–3 hrs labor
    Get local quotes
  12. 12

    Seat Belt Retraction Failure

    2complaints
    Low severityOther

    Seat belts fail to retract properly, posing potential safety risks.

  13. 13

    Steering Column Nut Defect

    2complaints
    High severitySteering

    The steering column nut may crack, posing a risk of a crash.

    $200–$1,500est. power-steering / eps repair · 1–6 hrs labor
    Get local quotes

Other years & sources

2010 Mercedes Benz C Class2016 Mercedes Benz C Class2017 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.

2018 Mercedes Benz C Class Problems: 13 Common Issues