Learn about the GM ignition switch scandal
The General Motors ignition switch scandal became a landmark case in automotive safety because a small mechanical defect produced outsized legal, engineering, and public-health consequences. Although the starter circuit, battery state of charge, and cranking speed all matter during normal starting, the underlying problem was not a no-start condition in the traditional sense. Instead, a low-effort key rotation could move the ignition switch out of the run position. That interruption removed electrical support from critical systems, including airbag deployment and power steering assist, while the vehicle could continue moving. Understanding this failure helps separate ordinary diagnostic checks for fuel delivery and starting behavior from a flaw tied to switch detent force and key position stability.
Essential answer
The essential answer is that the General Motors ignition switch scandal involved ignition switches that could rotate away from the run position too easily, especially when a heavy key ring or road motion pulled on the key. When the switch moved toward accessory or off, the engine could stall and the airbag controller could lose power. That created a risk of a crash in which the frontal airbags would not deploy as intended. The issue was not simply that the car failed to start; it was that a running vehicle could lose the electrical state needed for steering support and restraint electronics.
The scope of the problem involves the distinction between a starter circuit failure and an unstable run circuit. A driver troubleshooting a no-crank condition normally checks battery state of charge, cranking speed, and fuel delivery. In this defect, those checks might pass while the real vulnerability remained in the key cylinder and switch detent. The relevant diagnostic focus was not whether the engine could begin cranking, but whether the ignition switch could hold the run position during vibration, steering-column movement, or load from added keys. That difference is why the scandal reshaped how manufacturers evaluate switch torque, key position feedback, and the separation between starting and safety-system power.