An ignition system is made up of several components that combine to convert battery power into a running engine. The module is the computer that starts the whole process. It is common for the connections to the ignition module to corrode over time and the computer itself can overheat if it is not maintained. You can identify a faulty module by sudden stalling or stuttering in the engine. If your car won’t start again after stalling, it doesn’t necessarily mean that your battery is dead; it might simply be because a damaged module can no longer pull power from it.