P0462-FUEL LEVEL SENSOR 1 CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
Ignition on and battery voltage above 10.4 volts.
- Set Condition:
The fuel level sensor signal voltage goes below 0.4 of a volt for more than 4.4 seconds. One Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
| (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND |
| (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (G310) SENSOR GROUND CIRCUIT |
| FUEL LEVEL SENSOR |
| CAN C BUS CIRCUIT OPEN OR SHORTED |
| BCM |
| PCM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS).
Diagnostic Test
1. FUEL LEVEL SENSOR VOLTAGE BELOW 0.4 OF A VOLTNOTE: Diagnose all CAN C communication DTCs before continuing.
Ignition on, engine not running.
With the scan tool, read the Fuel Level Sensor voltage.
Is the Fuel Level Sensor voltage below 0.4 of a volt?
Yes
- Go To 2
No
- Refer to the INTERMITTENT CONDITION Diagnostic Procedure.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
2. FUEL LEVEL SENSOR
Turn the ignition off.
Disconnect the Fuel Pump Module harness connector.
Ignition on, engine not running.
With the scan tool, read the Fuel Level Sensor voltage.
Did the Fuel Level Sensor voltage change from below 0.4 of a volt to above 4.0 volts?
Yes
- Replace the Fuel Level Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 3
3. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO GROUND
Turn the ignition off.
Disconnect the C2 BCM harness connector.
Measure the resistance between ground and the (N4) Fuel Level Signal circuit in the Fuel Pump Module harness connector.
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 4
4. (N4) FUEL LEVEL SIGNAL CIRCUIT SHORTED TO THE (G310) SENSOR GROUND CIRCUIT
Measure the resistance between the (N4) Fuel Level Signal circuit and the (G310) Sensor ground circuit in the Fuel Pump Module harness connector.
Is the resistance below 5.0 ohms?
Yes
- Repair the short between the (G310) Sensor ground circuit and the (N4) Fuel Level Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 5
5. BCM
NOTE: Before continuing, check the BCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)
No
- Replace and program the Body Control Module per Service Information.
- Perform the BODY VERIFICATION TEST. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE)