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(a) Investigations.—The Secretary or the Board, as applicable, may begin an investigation under this part on the Secretary's or the Board's own initiative or on complaint. If the Secretary or Board, as applicable, finds that a carrier or broker is violating this part, the Secretary or Board, as applicable, shall take appropriate action to compel compliance with this part. If the Secretary finds that a foreign motor carrier or foreign motor private carrier is violating chapter 139, the Secretary shall take appropriate action to compel compliance with that chapter. The Secretary or Board, as applicable, may take action under this subsection only after giving the carrier or broker notice of the investigation and an opportunity for a proceeding.

(b) Complaints.—A person, including a governmental authority, may file with the Secretary or Board, as applicable, a complaint about a violation of this part by a carrier providing, or broker for, transportation or service subject to jurisdiction under this part or a foreign motor carrier or foreign motor private carrier providing transportation registered under section 13902 of this title. The complaint must state the facts that are the subject of the violation. The Secretary or Board, as applicable, may dismiss a complaint that it determines does not state reasonable grounds for investigation and action.

(c) Deadline.—A formal investigative proceeding begun by the Secretary or Board under subsection (a) of this section is dismissed automatically unless it is concluded with administrative finality by the end of the 3d year after the date on which it was begun.