Nissan Motor Co. said Wednesday its third-highest-ranked executive is leaving the company, in an abrupt move that deals yet another blow to the scandal-plagued Japanese carmaker.

Nissan said in a statement it accepted the resignation but did not disclose the reasons for the departure of Jun Seki, who took the automaker's No. 3 post of vice chief operating officer on Dec. 1. He was tasked with spearheading the implementation of its restructuring measures.

Seki is set to join leading Japanese electric-motor manufacturer Nidec Corp. as president and chief operating officer. The 58-year-old, who has confirmed the move, was among the contenders to be Nissan’s chief executive officer in October but missed out to Makoto Uchida, who was until recently the company’s China chief.