2017 Mercedes-Benz C 300 structure problems

What owners report

• “The contact owns a 2017 Mercedes-Benz C300. The contact stated that while driving 65 MPH on the highway, the contact heard a popping sound coming from an unknown part of the vehicle. The contact pulled over to the side of the road, exited the vehicle, and became aware that the roof panel had…”

  filed Nov 5, 2025

• “I am reporting a serious vehicle safety hazard caused by improper and unsafe repair work performed by USA Platinum Motor, located at 1221 California Lane #126B, Arlington, TX. I brought my 2017 Mercedes-Benz C300 in for a cold start rattle with no warning lights or prior issues. The shop diagnosed…”

  filed Oct 30, 2025

Verbatim excerpts from complaints filed with NHTSA. Reports are not independently verified.

Related recalls

• Please refer to MBUSA's recall report for specific vehicle details
  Campaign 23V854000 · Dec 15, 2023
• Front roof panel located between the windshield and the panoramic sunroof may not have…
  Campaign 21V197000 · Mar 19, 2021
• Due to a bonding issue introduced in the production process, the rear beltline trim may…
  Campaign 18V456000 · Jul 10, 2018

Related service bulletins

• Complaint Clanking noise from the area of the speakers in the doors. Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim…

  LI82.62-P-078631 · Service Bulletin/Repair Instructions · issued Aug 6, 2026

Structure problems in other C 300 years

Other reported problem areas on the 2017 Mercedes-Benz C 300