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 is investigating reports of alleged engine failures in GM's 6.2-liter L87 V-8, an engine used in a wide variety of trucks and SUVs. NHTSA estimates that more than 877,710 vehicles could be vulnerable to the issue.

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.