The National Highway Traffic Safety Administration (NHTSA) has opened an investigation into an estimated 120,000 BMW 7-Series sedans for a potential issue with the car not shifting into park and then rolling away.

NHTSA said it had opened a preliminary probe of the 2002-2008 models after receiving a complaint that a 2006 model rolled away after the consumer parked and exited the vehicle.

The cars have a small transmission control lever on the steering column and a button on the end is pushed to select ‘Park’.

Reports involving similarly equipped cars also describing roll-away incidents were submitted by BMW, according to NHTSA’s website, Reuters reported.

A BMW spokesman said the automaker is cooperating with the NHTSA and is not aware of any reports of accidents or injuries related to the issue.

A preliminary investigation is the first step in a process that could lead to a recall if regulators determine that a safety issue needs to be addressed by a manufacturer.

According to the complaint filed with NHTSA, the car was equipped with BMW’s electronic access and ignition system.

The shifter is designed to automatically shift the vehicle to park under a variety of conditions, including when the driver turns off the engine, according to the NHTSA website.

The NHTSA said no cause has been identified for any of the incidents.