This page covers 5 recalls and 16 owner complaints for the 2016 Mercedes-Benz C450.
Complaints about the 2016 Mercedes-Benz C450 are spread across a small number of reports, with wheels and structural issues drawing the most attention. On the wheels side, owners describe problems consistent with wheel or related component failures, though the details across reports vary. The structural complaints center on the panoramic sunroof, where multiple owners describe the roof panel or rails detaching or coming loose while driving, in a few cases the panel shifted or opened on its own at speed, and one owner reports the glass separating from the vehicle entirely on the highway. A single owner describes a propeller shaft universal joint fracturing at freeway speed, resulting in what they say was severe damage to the transmission and exhaust, though this appears to be an isolated report. One owner also mentions the gear selector behaving erratically when shifting between drive and reverse.
16
Total Complaints
By System
The 2016 Mercedes-Benz C450 has 5 recalls, with the most serious risks being panoramic roof glass that can detach while driving and a starter component that can overheat and melt surrounding parts, raising the risk of a fire.
Two recalls involve the roof structure. The front roof panel, located between the windshield and the panoramic sunroof, can lose its adhesive bond and detach from the vehicle, becoming a hazard for other drivers. One of these recalls specifically addresses panels where a prior repair may not have been bonded correctly, meaning the detachment risk applies even on vehicles that were previously serviced. There is also a software fault in the emergency call system that can cause the system to report an incorrect time and date, which may lead emergency responders to an inaccurate location during a crash.
At a glance
What can fail
The front roof panel between the windshield and panoramic sunroof may have been improperly bonded during a prior repair, causing the panel to detach from the vehicle.
What the fix does
Dealers will replace the front roof panel at no charge to you.
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Complaints are owner-reported and reflect individual experiences, not confirmed defects. They are distinct from recalls. Data sourced from the national vehicle safety complaint database. See trending complaints →
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The front roof panel between the windshield and panoramic sunroof may not be properly bonded to the vehicle from a previous repair, risking separation.
What the fix does
The dealer will remove and replace the front roof panel using proper bonding materials and procedures at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
A software error causes the eCall emergency system's date and time to be incorrect, which may result in an inaccurate vehicle location being sent during an emergency call.
What the fix does
Mercedes-Benz will send a remote software update to your vehicle. Dealers will verify the update worked or install a new communication module software at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
When the engine or transmission won't start, the starter motor keeps trying to turn over. This repeated effort can cause the starting current limiter to overheat.
What the fix does
A dealer will install an additional fuse in the electrical line to the starter motor to protect against overheating.
Summarized — see the official notice for exact wording, dates, and contacts.
At a glance
What can fail
The panoramic sunroof glass may not be properly bonded to the vehicle, which could cause the glass to detach and fall during driving.
What the fix does
Dealers will inspect the rear sunroof glass bonding and replace the glass panel if needed at no cost.
Summarized — see the official notice for exact wording, dates, and contacts.
