HAMTRAMCK (WWJ) – Slow sales of passenger cars are prompting General Motors to change its production plans at a big assembly plant.

GM confirmed Thursday that it will idle its Detroit-Hamtramck plant for six weeks, starting later this year, and slow production at the plant overall. This follows the elimination of a full shift, roughly 1,300 autoworkers, earlier this year.

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Autotrader analyst Michelle Krebs says this is the result of consumers shifting toward sport utilities and away from passenger cars

“Cars like those made at the Detroit-Hamtramck plant — Malibu, Impala, the Cadillac CT6 — those are losing favor with consumers who want SUVs,” she said.

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As consumer attitudes shift, automakers don’t want to be stuck with a bevy of unwanted passenger cars.

“What we are seeing is a decline in sales of those vehicles and automakers, instead of continuing to pour rich incentives on them, are cutting back production to lower their inventories,” said Krebs.

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GM won’t comment on specific production plans, but did say it intends to keep current production in line with demand.