General Motors is trading 4.09% lower at $88.65 amid a broad market sell-off, the clearest explanation for the decline. - The S&P 500 is down 3.76%, the Nasdaq Composite 4.96%, and the Dow 2.94%. - General Motors recalled 67,380 electric vehicles over a software defect that can temporarily reduce braking. Available reporting does not establish that the recall drove the share-price move.