The Fuel Injection Control Module replacements and Upgrades. The FICM - or Fuel Injection Control Module - is responsible for deciding how much fuel to deliver to individual engine cylinders. It does so by providing voltage to open and close the individual 6.0 fuel injectors that deliver already pressurized fuel to the engine. Over time, the module begins having difficulty doing its job. Output voltages drop and the injectors no longer open and close as they should. The result? A truck that is difficult or impossible to start, especially when the engine is cold. Depending on how bad the module has become, you may also notice a significant drop in fuel economy.