Abstract: A glow plug includes a heating rod (11), a plug body, a mounting device for mounting the heating rod, permitting axial translation movements of the heating rod relative to the plug body, a load sensor which is interposed between the heating rod and the plug body, and an electrical link, called the sensor link (71), which includes at least one signal line (74). The sensor link includes an earth conductive layer (82) which is interposed radially between the electrical power supply link of the heating rod and each signal line, to form a screening.