The U.S. National Highway Traffic Safety Administration said on Friday it was opening a preliminary probe into 877,710 vehicles manufactured by General Motors , after receiving reports alleging engine failure.

The National Highway Traffic Safety Administration’s Office of Defects Investigation has closed their preliminary investigation into General Motors' (NYSE:GM) Cruise division and will take no further action.

U.S. automobile safety regulators are closing their preliminary investigation into General Motors’ Cruise robotaxis without taking further action

The “Actually Smart Summon” feature enables drivers to remotely summon or move their vehicles to them or another location via a mobile phone app.

The agency said it analyzed 2,759 reports identified by Cruise that involved collisions, including 1,113 that involved a “pedestrian conflict.”