DTC P0462: Fuel Level Signal Low: Description

Fuel level sender changes resistance in response to fuel level. PCM monitors signal circuit of fuel level sender in order 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 signal circuit of fuel level sender in order to calculate percentage of fuel remaining in tank. PCM sends fuel level percent via class 2 serial data circuit to instrument cluster in order to control fuel gauge. Fuel level information is also used for misfire and EVAP diagnostics.