The National Highway Traffic Safety Administration (NHTSA) is opening up an investigation into corroded brake lines in Chevrolet and GMC pickup trucks and SUVs after receiving over 100 complaints from consumers. The problem could affect 6 million vehicles from 1999 through 2003 and has been blamed for three crashes, none of which injuries were sustained. The NHTSA suspects that the problem comes from vehicles driving in snowy northern states where salt is used for icy conditions.

GM spokesman Alan Adler said the company is aware of the issue and is working with NHTSA to look at possible causes and consequences of the alleged defect.