It’s “Truck Month” at Chevrolet dealerships, yet General Motors isn’t able to build any trucks.

Automotive News reported that the last GM pickup plant in North America that was still running during the UAW’s strike had to shut down last week because of parts shortages, raising worries that some dealerships soon will start running low on the automaker’s top-selling vehicles.

The production standstill could hurt dealers’ inventory in just two weeks, one analyst says. And it could put Chevy at an even greater disadvantage against rivals Ford and Ram.

GM was “not caught in a good position for a strike with trucks,” said Tyson Jominy, vice president of data and analytics consulting for J.D. Power. “Truck supply may start to get a little tight soon, if it’s not already getting to that point.”

GM’s lost profits have been piling up since UAW members walked out of its plants Sept. 16. Through Sunday, Oct. 6, GM will have lost $660 million in profit, according to Anderson Economic Group in East Lansing, Mich. Daily losses started at less than $10 million per day, the firm said, but will catapult to $90 million per day if the strike extends to a month.

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