DETROIT (AP) — Subaru of America is recalling more than 47,000 cars and SUVs with remote starters because the engines can start on their own.

The recall affects some Legacy and Outback cars from the 2010 to 2013 model years. Also covered are the Impreza from 2012 and 2013 and the XV Crosstrek from 2013.

Subaru says that if the key fob is dropped, it can malfunction and start the engine. The motor will run for up to 15 minutes, but could continue to start and stop until the car runs out of gas or the fob battery dies. If the cars are parked in a garage, there’s a risk of carbon monoxide buildup.

The cars all have automatic or continuously variable transmissions. Subaru dealers will replace the fobs free of charge.