2017 Mercedes-Benz C300 Structure & Body Problems
NHTSA lists 24 Structure & Body complaints for the 2017 Mercedes-Benz C300, 11% of its 216 total complaints for the year, with a median failure mileage of 40,000. Five related recalls cover the front roof panel, panoramic sunroof, and seatback locks. Two crashes and two injuries are tied to this area.
- Structure & Body complaints
- 24
- 11% of 216
- Crashes reported
- 2
- Fires reported
- 0
- Injuries reported
- 2
- Median mileage
- 40,000 mi
- Related recalls
- 5
Typical body and structure symptoms owners report
- The front roof panel between the windshield and panoramic sunroof detaches or flies off the vehicle while driving at highway speeds, sometimes near 70-75 MPH.
- The panoramic sunroof glass panel separates, lifts, or cracks along its rails, with owners describing loud cracking noises before the panel becomes loose in its tracks.
- Some owners report the sunroof failure occurred again after a recall repair, or that their VIN was not covered by the existing recall despite the same symptom.
- Owners describe whistling noises at speed followed by water leaking into the cabin through the windshield-area bonded panel.
- One owner reported the glass moon roof suddenly shattered while driving about 35 mph, sending glass into the cabin.
When 2017 Mercedes-Benz C300 body and structure complaints were filed
First complaint Mar 20, 2018, latest Dec 16, 2025.
Structure & Body recalls for the 2017 Mercedes-Benz C300
- NHTSA 23V854000Dec 15, 2023Structure & Body2,976 vehicles
Structure:body:roof and pillars
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2014-2020 C-Class, CLA, GLA, S-Class, GLC, and GLE vehicles. Please refer to MBUSA's recall report for specific vehicle details. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair, allowing the front panel to detach from the vehicle.
Risk: A detached roof panel can become a road hazard, increasing the risk of a crash.
Remedy: Dealers will replace the front panel, free of charge. Owner notification letters were mailed on August 2, 2024. Owner notification letters will be mailed in phases, on, March 22,2024, and August 2, 2024. Owners may contact MBUSA customer service at 1-800-367-6372. This recall is an expansion of NHTSA recall number 21V-197.
- NHTSA 21V197000Mar 19, 2021Structure & Body15,096 vehicles
Structure:body:roof and pillars
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2020 C300 Coupe, C43 Coupe AMG, C43 AMG, 2015-2020 C300, GLA250, 2016-2018 C350e, CLA45 Coupe AMG, 2015 C400, S65 AMG, 2015-2019 C63 AMG, 2016 C450, 2015-2016 GLA45 AMG, S600, 2016-2020 GLC300, 2017-2019 GLC43 AMG, GLE43 Coupe AMG, 2014-2019 CLA250 Coupe, 2014-2015 CLA45 AMG, 2018 GLC63 AMG, 2014-2017 S550, 2018-2020 S450, 2016-2019 GLE63 Coupe AMG, 2016 GLE450 Coupe, 2014-2020 S63 AMG, 2018-2019 S560, and 2019 GLC350e vehicles equipped with a panoramic sunroof. The front roof panel located between the windshield and the panoramic sunroof may not have been bonded correctly to the vehicle during a prior repair.
Risk: The adhesive bonding of the front panel might deteriorate, possibly causing the front panel to detach from the vehicle and become a road hazard, increasing the risk of a crash.
Remedy: Mercedes-Benz dealer will remove the bonded panel and will install a new front panel by following the detailed repair instructions and using the approved primer, cleaner and adhesive, free of charge. Owner notification letters were mailed on September 3, 2021 and October 26, 2021. Owners may contact MBUSA customer service at 1-800-367-6372.
- NHTSA 19V130000Feb 26, 2019Structure & Body22,637 vehicles
Seats
Mercedes-Benz USA, LLC (Mercedes) is recalling certain 2017-2018 Mercedes-Benz C300 Cabriolet, C300 Coupe, AMG C43 Coupe, C300 4MATIC Cabriolet, C300 4MATIC Coupe, AMG C43 Cabriolet, AMG C63 Cabriolet, AMG C63 Coupe, AMG C63 S Cabriolet and AMG C63 S Coupe vehicles and 2018 Mercedes-Benz E400 Coupe, E400 Cabriolet, E400 4MATIC Cabriolet and E400 4MATIC Coupe vehicles. The seatbacks of the front seats may not properly lock on the right side of the seat.
Risk: If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
Remedy: Mercedes will notify owners, and dealers will inspect the locking of the seatback on the affected vehicles and replace the seatback lock, as necessary, free of charge. An interim owner letter was mailed on April 12, 2019 to notify owners. Owners will receive a second notification when the remedy is available. Owners may contact Mercedes-Benz customer service at 1-800-367-6372. MBUSA's number for this recall is 2019040007.
- NHTSA 18V456000Jul 10, 2018Structure & Body10,826 vehicles
Structure:body
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 Mercedes C300 Cabriolet, C300 4Matic Cabriolet, C43 AMG Cabriolet, C63S AMG Cabriolet, and C63 AMG Cabriolet vehicles. Due to a bonding issue introduced in the production process, the rear beltline trim may separate from the vehicle.
Risk: If the beltline trim were to separate from the vehicle while driving, it could become a road hazard, increasing the risk of a crash.
Remedy: MBUSA will notify owners, and dealers will inspect the rear beltline trim and replace the trim if necessary, free of charge. The recall began on September 21, 2018. Owners may contact MBUSA customer service at 1-800-367-6372.
- NHTSA 18V207000Mar 29, 2018Structure & Body3,088 vehicles
Seats
Mercedes-Benz USA, LLC (MBUSA) is recalling certain 2017-2018 C43 AMG 4Matic Coupe, C300 Coupe, C300 4Matic Coupe, C300 4Matic Cabriolet, C300 Cabriolet, C43 AMG 4Matic Cabriolet and C63S AMG Cabriolet, 2017 C63 AMG Cabriolet, C63S AMG Coupe and C63 AMG Coupe, 2018 E400 Coupe and E400 4Matic Coupe vehicles. The seatbacks of the front seats may not properly lock on the right side of the seat.
Risk: If the seatback does not properly lock, in the event of a crash, the seatbacks may fold forward, increasing the risk of injury.
Remedy: MBUSA will notify owners, and dealers will inspect the locking of the seatbacks, replacing the seatbacks lock, as necessary, free of charge. The recall is expected to begin May 25, 2018. Owners may contact MBUSA customer service at 1-800-367-6372. MBUSA's number for this recall is 2018040007.
Structure & Body complaints by C300 model year
Raw complaint counts per model year; newer years have had less time to accumulate complaints.
Frequently asked questions
- How common are Structure & Body complaints on the 2017 Mercedes-Benz C300?
- NHTSA has logged 24 Structure & Body complaints for the 2017 C300, which is 11% of the 216 total complaints filed for that model year.
- Is there a recall for the 2017 C300 roof or sunroof panel?
- Yes. NHTSA recall 21V197000 covers the front roof panel on 2017-2020 C300 vehicles, and recall 23V854000 also addresses a front roof panel issue on related Mercedes-Benz models from 2014-2020.
- At what mileage do these structure and body problems tend to show up?
- The median mileage at failure for Structure & Body complaints on the 2017 C300 is 40,000 miles.
- Have these body issues caused any crashes or injuries?
- NHTSA records show 2 crashes and 2 injuries associated with Structure & Body complaints on the 2017 C300, with no fires reported.
- Are there other recalls besides the roof panel one?
- Yes, NHTSA lists five Structure & Body recalls for this range of C300 model years, including seatback lock issues (campaigns 19V130000 and 18V207000) and a rear beltline trim bonding issue (campaign 18V456000).