U.S. auto safety regulators have opened an investigation into complaints that General Motors vehicles equipped with certain V8 engines, including its best-selling Silverado, can seize up without warning.

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 did not immediately respond to a request for comment

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,

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.

The NHTSA just opened a preliminary investigation into reports that GM's widely used V8 engine could fail without warning in 870,000 trucks and SUVs.