DTC Advanced Diagnostics: P0462 (3.5L Engine)
DTC P0462: Fuel Level Sensor (Fuel Gauge Sending Unit) Circuit Low 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 received voltage information from the gauge control module is high or low for a set time, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 5 seconds or more |
| DTC Type | Two drive cycles, MIL off |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery] | 10.0 V | - |
| Vehicle | ON mode | |
[ ]: HDS Parameter
Malfunction Threshold
The voltage information of the circuit between the fuel level sensor (fuel gauge sending unit) and the gauge control module which the PCM received from the gauge control module is low for at least 5 seconds.
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- Fuel level sensor (fuel gauge sending unit) FUEL GAUGE+ line short to ground
- Fuel level sensor (fuel gauge sending 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, the freeze data, and the on-board snapshot are stored. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, the freeze data, and the on-board snapshot can be cleared with the scan tool clear command.