The U.S. National Highway Traffic Safety Administration said on Tuesday it had opened an investigation into about 174,000 Tesla (TSLA.O), opens new tab Model Y cars from the 2021 model year over reports that electronic door handles can become inoperative.

NHTSA said it had received reports citing an inability to open exterior doors, including after parents exited the vehicle to remove a child or to place a child in the rear seat before starting a trip.