About 160,000 lawn mowers made in the United States, Canada and Mexico were sold under the Black & Decker and Craftsman brands from September 1995 through December 2006 for about $450.
They were made by Black & Decker Inc. of Towson, Md.
The commission said the motor and blades can turn on unexpectedly even after the mower's safety key has been removed. Black & Decker has received 34 reports of unexpected start-ups. Two of those incidents included injuries to consumers.
The Black & Decker mowers involved in the recall include model number CMM1000 or CMM1000R. The Craftsman mowers involved have model number 900.370520.
Consumers were advised to stop using the recalled mowers and call Black & Decker or Sears for a free inspection and repair or credit towards a new mower.
Consumers can call 888-281-5314 for information.