I'm afraid you don't understand the razor thin line between profit and loss. Due to the very large fixed overhead of the automive industry, profitability is very closely linked to volume. What is a very nice pre tax profit margin (which in GM's case is post tax profit margin) can rapidly become a pre tax loss if volume declines significantly enough to affect the unit overhead ammortization. It can be the result of either market decline or unfavorable customer response. GM has been bleeding US market share for two decades. Their brands, perhaps with the exception of Cadillac, no longer have market cachet.