Automaker has five car factories with plenty of unused capacity.
Total number of vehicles sold for the month: 186,447, down from 187,540 in March last year.
All waste from daily operations is recycled, reused or converted to energy.
Move comes amid a continuing slump in sales of passenger cars generally in North America.
Automaker says it needs better cost performance from its operations in South Korea, where sales have slowed.
First city outside of the US to offer app-driven service, now in 17 American cities since it was launched two years ago.
Automaker says it could save $1 billion and avoid recalling up to 6.8 million full-size 2007-2011 pickup trucks and SUVs.
Project aims to reduce electricity costs, greenhouse gas emissions by 77%.
Automaker now sells fewer than 50,000 electric vehicles worldwide but predicts that will rise to near 1 million by 2026.
Unifor is waiting on a response from GM on the outstanding issues.
Unifor is demanding GM makes the Ingersoll, Ont. plant the lead for the popular crossover SUV.
Automaker says trading volume of its shares are too low on the Toronto-based stock exchange.
Company names new management in an attempt to chart a turnaround.
Company says open strategy will bring environmental and safety benefits of autonomous vehicles to market faster.
Plants in Ohio and Kansas will be closed for up to five weeks; automaker blames slumping sedan sales.