The Mustang and Camaro are the two of the biggest names in the muscle car world, and production of both vehicles is now temporarily suspended due to parts supply issues.

Ford and General Motors both announced that they would be idling the factories that make the Mustang and the Camaro for one week, following issues with the parts supply chain.

GM will be idling its Lansing Grand River Assembly facility which currently builds both the Camaro, Cadillac CT4, and CT5, which are all based on the same platform. GM did not specify what parts it was missing in order to complete Camaros, but spokesman Dan Flores told Autonews that it was not related to microchips.

Read More: GM To Idle Sierra And Silverado Plant For Two Weeks Due To Chip Shortages

As for Ford, as reported by Fox Business, it cited semiconductor supplies as the main issue for the shutdown of its Flat Rock Assembly Plant in Michigan, which only builds the Mustang. Ford’s other North American plants will continue to operate normally for now.

Ford has recently been forced to pause production at other plants due to a chip shortage as well, such as the Kansas City assembly plant where they make the F-150.

Vehicle sales were down approximately 16% in the first quarter of 2022 because of the low inventory caused by the coronavirus pandemic. The automotive industry is struggling to recover from the COVID-19 Pandemic amid supply chain problems and the ongoing conflict in Ukraine.

The Dodge Challenger is currently the only muscle car being manufactured at this time, at Stellantis’ factory in Brampton, Ontario, Canada. Both Flat Rock and Lansing are expected to be back up and running by April 11th.