Mercedes-Benz USA has issued safety recalls for about 6,200 models of its 2018 S-Class and 2019 C-class luxury sedans.

The automaker is recalling the 2018 S450 4Matic, S560 4Matic Coupe, S63 AMG 4Matic Coupe, Maybach S560 4Matic, S560 4Matic, S63 AMG and S63 AMG 4Matic Cabrio vehicles because the Hands-off-Detection system may malfunction. The defect could cause the Active Steering Assist system to remain engaged even if the driver's hands are not on the steering wheel for an extended time period.

If the system remains active, despite the driver not having their hands on the wheel, the driver's inattention may increase the likelihood of a crash.

To fix the problem, dealers will update the steering control unit software, at no cost to owners.  Mercedes notified owners via an interim letter on Feb. 14, and will mail a second notification when the remedy is ready.

Mercedes is also recalling approximately 675 2019 C43 AMG, C43 AMG Cabrio, C43 AMG 4Matic Coupe, C300 4Matic, C300 4Matic Coupe, C300 Coupe, C300 Cabrio, C300 4Matic Cabrio, and C300 vehicles for a parking brake issue.

After parking and exiting the vehicle, the Electronic Stability Program software may prevent the electronic parking brake from being disengaged when returning to the vehicle, unless the system is deactivated.

Driving the vehicle with the system deactivated could increase the chance of a collision.

To remedy the matter, Mercedes has notified owners, and dealers will update the software at no cost to owners. The recall began Jan. 29. Mercedes' number for this recall is 2018120025.

Owners can reach Mercedes customer service at (800) 367-6372.