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Symptom: P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH When Monitored and Set Condition: P0463-FUEL LEVEL SENDING UNIT VOLTS TOO HIGH When Monitored: Ignition on and battery voltage above 10.4 volts. Set Condition: The fuel level sensor signal voltage at the PCM goes above 9.9 volts for more than 90 seconds. POSSIBLE CAUSES FUEL LEVEL SENSOR SIGNAL CIRCUIT OPEN FUEL PUMP MODULE WIRING HARNESS INTERMITTENT SENSOR GROUND CIRCUIT OPEN FUEL LEVEL SENSOR POWERTRAIN CONTROL MODULE FUEL LEVEL SENSOR SIGNAL CIRCUIT SHORTED TO SENSOR GROUND CIRCUIT TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read the fuel level sensor voltage. Is the fuel level sensor voltage above 9.9 volts? All Yes → No → 2 Turn the ignition off. t, read the Fuel Level Sensor voltage. Did the Fuel Level Sensor voltage change from above 9.0 volts to below 0.4 volts? All Yes → Replace the fuel level sensor. No → 133 DRIVEABILITY - GAS |