U.S. safety regulators announced that they are investigating complaints relating to an issue with Hyundai Genesis full-size luxury cars.

The National Highway Traffic Safety Administration says the probe affects approximately 40,000 vehicles released for the 2009 model year.

The NHTSA said it has received at least 23 complaints from drivers that had to push harder than usual on the brake pedal to make the Genesis stop, according to Reuters.

At least one crash has occurred. A driver in Florida hit a stopped vehicle while another had to use the emergency brake to stop, sending the vehicle into a spin at a red light.

No injuries have been reported yet however, according to the NHTSA.

Click here for an update on the investigation.

A spokesman for Hyundai Motor Co. said the company is investigating the problem and will cooperate with the NHTSA, according to Reuters.

Several complaints claim the issue was traced to a faulty antilock brake computer.

The investigation will figure out if the issue is big enough to result in a recall.

The Genesis investigation is the first conducted by the agency since the 16-day partial government shutdown, which started on Oct. 1.

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