The Ignition Control Module (ICM) is a crucial component in ignition system. It is responsible for controlling the timing and strength of the spark that ignites the fuel mixture in the engine's combustion chamber. The ICM receives signals from various sensors, such as the crankshaft position sensor, and uses this information to determine when to send a signal to the ignition coil to create a spark. A faulty ICM can cause issues such as misfires, stalling, and poor fuel economy. Therefore, it is important to regularly inspect and replace an old or failing ICM with a new one that meets OEM specifications.