Chevrolet Corvair
Few cars have been as catastrophic of a failure as the Corvair was. Everything about the car was a shortcut, and it was highly publicized. US congressman Ralph Nader famously published the book “Unsafe At Any Speed” directly linked to the Corvair. The Corvair was almost impossible for the driver to control at high speeds, resulting in thousands of deadly accidents (via Hemmings).

On top of the obvious design flaws with drivability, the Corvair also had issues with toxic fumes being leaked into the cabin. The Corvair was meant to be a sports car, combined with the affordable price of a compact. The result was something that gave GM a bad reputation for a long time afterward.