P0463

DTC P0463 Fuel Level Sensor Circuit High Voltage






Circuit Description

The fuel level sensor is a device used to determine the level of fuel in the tank. The PCM applies a signal voltage to the sensor. The sensor varies the voltage based on the level of fuel in tank. The sensor resistance is high when the tank is full, and the PCM senses a high signal voltage. As the fuel level in the tank decreases, the sensor resistance drops, and the signal voltage at the PCM is pulled low.

The PCM also sends the fuel level information via class 2 serial data to the IPC. The IPC uses the information to control the fuel gauge.

The PCM monitors the fuel level sensor for signal voltages outside the normal range of the sensor. If the PCM detects a signal voltage above the calibrated range of the sensor, DTC P0463 will set.

Conditions for Running the DTC

- The ignition is ON.
- System voltage is between 11-16 volts.

Conditions for Setting the DTC

The PCM detects a fuel level sensor voltage that is more than 3 volts for at least 10 seconds.

Action Taken When the DTC Sets

The PCM stores conditions which were present when the DTC set as Failure Records only. This information will not be stored as Freeze Frame Records.

Conditions for Clearing the MIL/DTC

- The DTC becomes history when the conditions for setting the DTC are no longer present.
- The history DTC clears after 40 malfunction free warm-up cycles.
- The PCM receives a clear code command from the scan tool.

Diagnostic Aids

Important: Fuel level is used to determine EVAP system diagnosis. Always diagnose the fuel level sensor before any other EVAP system components or DTCs.

Refer to Diagnostic System Check - Instrument Cluster Initial Inspection and Diagnostic Overview.

Reviewing the Fail Records vehicle mileage since the diagnostic test last failed may assist in diagnosing the condition. The information may help determine how often the condition that set the DTC occurs.

Test Description










The number(s) below refer to the step number(s) on the diagnostic table.

2. The operating range of the fuel level sensor is between 3 and 100 percent. A value that is out of range will set a DTC.
4. Tests for the proper operation of the circuit in the high voltage range.
5. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.