DTC P0463: Fuel Level Signal High: Description

Fuel level sender changes resistance based on fuel level. Powertrain Control Module (PCM) monitors fuel level sender signal circuit to determine fuel level. When fuel tank is full, sender resistance is high and PCM senses a high signal voltage. When fuel tank is empty, sender resistance is low and PCM senses a low signal voltage. PCM uses fuel level sender signal circuit to calculate total remaining fuel (percentage) in fuel tank. PCM sends fuel level percent to instrument cluster through class 2 serial data link to control fuel gauge. Fuel level information is also used for misfire and EVAP diagnostics.