Here’s why GM’s stock is having its worst day in over a year

General Motors shares fell sharply after the automaker cut its full-year profit outlook and said it would pause some truck production. The combination weighed on investor sentiment: a reduced earnings forecast signals softer near-term profitability, while a production pause raises questions about supply and how quickly inventory can be adjusted to demand.

For the broader market, GM is often read as a bellwether for the U.S. auto sector and for consumer spending on big-ticket goods. A weaker outlook can ripple across suppliers, dealers and lenders with auto-loan exposure, and it may prompt analysts to revisit assumptions about pricing, incentives and margins across the industry.

What to watch: management's commentary on the length of the production pause, demand trends for trucks and SUVs, and whether other automakers adjust their own guidance. Investors will also focus on inventory levels and incentive spending, since those often shape margins. The key question is whether this is a temporary production adjustment or an early sign of a broader slowdown in vehicle demand.