It is the second time production has been interrupted for the Volt.
The Volt, which can go 38 miles on battery power, has been a hard sell at most dealerships.
General Motors will halt assembly of the Volt for at least four weeks starting next month.
The Detroit-Hamtramck plant is expected to be shuttered from Sept. 17 until Oct. 15.
GM also notified suppliers last week, according to another source in the supply chain.