What will happen when a Ignition Control Module goes bad?

When an Ignition Control Module (ICM) goes bad, the engine may experience misfires, rough idling, or difficulty starting. It can lead to a complete loss of spark, causing the engine to stall or not run at all. Additionally, you may notice a decrease in fuel efficiency and increased emissions. In some cases, the check engine light may illuminate, signaling a problem that needs to be addressed.