The two companies will continue to work together, though, and will push ahead with plans to merge production of their respective compact MPV and SUV models onto a PSA platform.
Existing joint-venture projects will continue as well. The planned new B-segment MPV will be built at GM's Zaragoza plant in Spain, while a new C-segment crossover model will be built by PSA's Sochaux plant in France. The first vehicles from that project are expected to be seen in 2016.
Vice chairman Steve Girsky said: "Our equity stake was planned to support PSA in their efforts to raise capital at the time of the creation of the GM and PSA alliance, and that support is no longer needed.
"The alliance remains strong with our focus on joint vehicle programmes, cross manufacturing, purchasing, and logistics. We’re making good progress while remaining open to new opportunities.”