General Motors currently has no projects underway with ride-sharing company Lyft, in which it has a 9% stake, CEO Mary Barra has said.
A Reuters report noted Ford last year said it would collaborate with Lyft to deploy large numbers of Ford self-driving vehicles on Lyft's network by 2021.
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Speaking to Reuters ahead of GM's annual shareholders meeting in Detroit, Barra said it could take several years for Japan's SoftBank Group's investment in GM's autonomous vehicle unit Cruise to see results.
Softbank said last month it would invest $2.25bn in Cruise, one of the largest and highest profile investments to date in self-driving technology.
When asked about the impact of tariffs imposed by the Trump administration on steel and aluminum imports and ongoing efforts to renegotiate the North American Free Trade Agreement, Barra told Reuters the issue was "exceptionally complex".
"We need to let negotiations continue and be completed," she said.
But Barra added that "continued uncertainty (over trade) will eventually have an impact."
See also: GM's Ammann leaves Lyft board
