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DTC P0463 - FUEL LEVEL SENSOR CIRCUIT VOLTAGE HIGH GMC Envoy I

Testing & Diagnostics ~143 words

Note. For circuit reference, see WIRING DIAGRAMS - 4.3L article.

Circuit Description

Fuel level sensor is an important input to VCM for enhanced evaporative system diagnostic. Fuel level is necessary for VCM to know volume of fuel in fuel tank. Fuel level affects rate of change in air pressure in EVAP system. Several enhanced evaporative system diagnostic sub-tests are dependent upon correct fuel level information. Diagnostic will not run when tank is greater than 85 percent or less than 15 percent full. Sensor signal will disable misfire when fuel levels are less than 15 percent.

Conditions for setting DTC

  1. Fuel tank level slosh test is completed.
  2. Fuel tank level main test is completed.
  3. Fuel tank level data valid.
  4. Fuel level signal voltage is greater than 2.9 volts for a period longer than 20 seconds.

More articles — Engine Controls - Tests W/codes - 4.3L