What problems will a bad neutral safety switch cause?

A faulty neutral safety switch can lead to significant issues, primarily preventing the vehicle from starting when it's in gear, which can pose a safety risk. Additionally, it may allow the engine to start while in gear, increasing the chance of sudden movement and accidents. Other symptoms may include issues with the transmission shifting or erratic behavior of the vehicle's starter system. Overall, a malfunctioning switch can compromise both vehicle operation and safety.