Mercedes-Benz USA is recalling 28,452 2015 Mercedes-Benz C300 and C400 4Matic sedans because they may have a loss of electric power steering assist, according to the National Highway Traffic Safety Administration.

"If the vehicle experiences a loss of power steering assist, extra steering effort will be required, especially at lower speeds, increasing the risk of a crash," said NHTSA in its recall summary.

The problem is due to a software design issue at a supplier, the automaker told federal safety regulators.

There are no injuries or crashes linked to the recall, Mercedes-Benz said.

The driver is made aware of the electric power steering deactivation by a red warning message in the instrument cluster.

The affected vehicles were built from January 27, 2014 to December 1, 2014.

Vehicles Affected: Approximately 28,000 model-year 2015 Mercedes-Benz C300 and C400 4Matic sedans manufactured between Jan. 27 and Dec. 1, 2014

The Problem: Due to an error in the electric power steering control unit software, a loss of electric power steering assist could occur, necessitating extra steering effort, particularly at lower speeds, and increasing the risk of a crash.

The Fix: Dealers will update the power steering software for free.

What Owners Should Do: Mercedes will begin notifying owners this month. Owners can call the automaker at 800-367-6372, the National Highway Traffic Safety Administration's vehicle-safety hotline at 888-327-4236 or go to www.safercar.gov for more info.