DTC P0463
DTC P0463: Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit High Voltage
General Description
The fuel level sensor (fuel gauge sending unit) is incorporated into the fuel pump and installed in the fuel tank. Using a built-in potentiometer and float, it converts the movement of the float to electrical signals as an output that corresponds fuel level variations in the fuel tank. The fuel level, which is indicated by the gauge control module, is sent to the powertrain control module (PCM) via the controller area network (CAN). If the PCM detects a signal from the fuel level sensor (fuel gauge sending unit) above a predetermined value for a set time, it detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type, OBD Status
| Execution | Continuous |
| Sequence | None |
| Duration | 5 seconds or more |
| DTC Type | Two drive cycles, MIL off |
| OBD Status | PASSED/FAILED/NOT COMPLETED (STILL TESTING) |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| Battery voltage [BATTERY] | 10.0 V | - |
| Ignition switch or Engine start/stop button | Vehicle ON mode | |
| No active DTCs set (prevents monitor from running) | P0462, U0029, U0155 | |
[ ]: HDS Parameter
Malfunction Threshold
The fuel level sensor (fuel gauge sending unit) output voltage is 4.92 V or more for at least 5 seconds.
Possible Cause
- Fuel tank unit FUEL+ line open
- Fuel tank unit FUEL- line open
- Fuel tank unit failure
- Gauge control module internal circuit failure
- PCM internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the battery.