Nearly 750,000 General Motors vehicles are being investigated over complaints that airbags may not inflate in a crash.
The National Highway Traffic Safety Administration says the probe covers Chevy, Cadillac and GMC vehicles from last year and this year.
Most are full-size pickup trucks and SUVs.
The agency says it has 15 complaints of airbag malfunctions including 6 crashes with 8 reported injuries.
GM issued a service bulletin to dealers about the problem last month but there hasn't been a recall.
