Ignition modules are usually found either in the distributor, on the distributor housing or in the engine compartment. It is the electronic control for the ignition system that works by receiving a signal from a magnetic pickup or a sensor in the distributor. The ignition module then uses the signal to open and close the ground circuit to the ignition coil to fire the spark plugs.

In the event of a malfunction replacement ignition modules for every make and model of car are readily available as it as it is such an essential component in ignition systems.