(Reuters) -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.

Complaints received by the agency allege a bearing failure that may result in either an engine seizure or a breaching of the engine block. GM said it is cooperating with the agency.

The National Highway Traffic Safety Administration (NHTSA) has opened a preliminary probe into more than 877,000 trucks and SUVs built by General Motors. The agency’s Office of Defects Investigation (ODI) has received 39 complaints of engine failure due to a problem linked to faulty connecting rod bearings.