The U.S. National Highway Traffic Safety Administration said it was opening a preliminary probe into 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.

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