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. If PCM senses fuel level signal more than 98 percent for more than 15 seconds, DTC P0463 will set. When DTC sets, fuel gauge defaults to empty and low fuel indicator illuminates.

A current DTC P0463 becomes a history DTC if condition for setting DTC is no longer present. A history DTC P0463 will clear after 40 consecutive ignition cycles if condition for setting DTC is no longer present. DTC will also clear when scan tool is used to clear DTCs.