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  • P0462 Low Voltage Detected At The Fuel Level Sensor

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    Mopar1973Man

    P0462 LOW VOLTAGE DETECTED AT THE FUEL LEVEL SENSOR

    When Monitored and Set Condition:

    When Monitored: Ignition on and battery voltage above 10.4 volts.
    Set Condition: The signal voltage from the sensor falls below a calibrated value for a calibrated amount of time.

    POSSIBLE CAUSES

    • FUEL LEVEL SENSOR
    • (G8) SIGNAL CIRCUIT OPEN
    • (G8) SIGNAL CIRCUIT SHORTED TO VOLTAGE
    • INTERMITTENT CONDITION
    • ECM

    DIAGNOSTIC PROCEDURE

    1. Turn the ignition off. Disconnect the Fuel Level Sensor harness connector. Check connectors - Clean/repair as necessary. Measure the resistance of the sensor across the (G8) signal circuit and (K4) return circuit. Is the resistance less than 10 ohms?
      Yes --> Go To 2
      No --> Replace the fuel level sensor. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    2. Disconnect the ECM harness connectors. Check connectors - Clean/repair as necessary. Measure the resistance of the (G8) signal circuit between the ECM harness connector and the sensor harness connector. Is the resistance less than 10 ohms?
      Yes --> Go To 3
      No --> Repair the open (G8) signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
    3. Measure the voltage between the (G8) signal circuit and battery negative. Is the voltage greater than 1 volt?
      Yes --> Repair the (G8) signal circuit shorted to voltage. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).
      No --> Go To 4
    4. Reconnect the ECM harness connector. While monitoring with the DRBIII®, connect a jumper wire between the (G8) signal circuit in the sensor harness connector and battery negative. Did the DTC P0463 set?
      Yes --> Test Complete.
      No --> Replace the ECM. Perform POWERTRAIN VERIFICATION TEST VER - 1 (DIESEL).

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