DETROIT -- General Motors will idle the Michigan plant that produces the Cadillac ATS and CTS for three weeks amid a glut of inventory.
The company's Grand River Assembly plant in Lansing, Mich., will stop production beginning the week of Aug. 18, and resume output on Sept. 8, according to two people familiar with the plant's schedule.
GM spokeswoman Erin Davis said the company "does not comment on production schedules" and that it is "matching supply to demand."
The move comes as U.S. sales of the ATS and CTS sag, pushing inventories to unusually high levels.
On Aug. 1, there were 15,100 ATS sedans on dealer lots or in transit, or a 152-day supply based on the recent selling rate, according to the Automotive News Data Center. CTS inventory stood at 16,900 units, or a 215-day supply.
Dealership lots also are swollen with excess supply of Cadillac's two other passenger cars: The XTS sedan, assembled in Canada, had a 152-day supply on Aug. 1; and the ELR plug-in hybrid's inventory stood at 1,400 units, a 194-day supply at the coupe's glacial selling pace.
GM dealers have sold just 578 of the $75,995 ELR (including destination fees) since its January launch. It's built at GM's Detroit-Hamtramck assembly plant in Michigan.
Overall, Cadillac's car inventory stood at 44,700 units on Aug. 1. Thatís equal to a 172-day supply -- about triple the level that is considered healthy. By comparison, Lincoln's car inventory was 87 days on Aug. 1. Audi's was 45 and BMW's was 42.
Overall, Cadillacís U.S. sales have slipped 2 percent to 97,358 this year through July, in a luxury market that has expanded 6 percent.