Systems and methods utilize a controller configured to perform a diagnostic routine for a combustion seal provided between a gasoline direct injection (GDI) fuel injector and a combustion chamber of a cylinder of a GDI engine. The diagnostic routine comprises determining one of (i) a period for the injector coil current to reach a peak current and (ii) a resistance of the injector coil while the injector coil current is saturated, determining whether the determined period or the determined injector coil resistance is greater than a respective threshold indicative of a predetermined temperature of the injector coil, and when the determined period or the determined injector coil resistance is greater than its respective threshold, detecting a combustion seal leak fault. Based on the combustion seal leak fault, the controller may modify operation of the engine to prevent potential heat damage to the engine.