DTC P0464 2.8L, 3.0L, 3.2L, and 3.6L Engines

Diagnostic Instructions

DTC Descriptor

DTC P0464: Fuel Level Sensor Circuit Intermittent

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Fuel Level Sensor Signal	P0462	1	P0463, P0464	P0463	P0461
Fuel Level Sensor Low Reference	--	1	P0463, P0464	P0463	P0461
1. Fuel Gage Inaccurate or Inoperative

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The engine control module (ECM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is high and the ECM senses a high signal voltage. When the fuel tank is empty, the sensor resistance is low and the ECM senses a low signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of remaining fuel in the tank. The ECM sends the fuel level percentage via serial data circuit to the instrument panel cluster (IPC). The ECM sends a serial data message to the IPC in order to display the fuel level percent on the fuel gage.

This diagnostic tests for an intermittent fuel level sensor signal. If a change in fuel level is detected, DTC P0442 is aborted due to a possible refueling event. If refueling is confirmed, the test for DTC P0464 is considered a pass. The refueling event test must pass two out of three times, otherwise, the DTC P0464 will set indicating an intermittent signal problem.

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Instrument Cluster Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
2. Ignition OFF, test for less than 1 ohm between the low reference circuit terminal C and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Install a Signal Generator and Instrument Panel Tester between the signal circuit terminal B and the low reference circuit terminal C.
4. Ignition ON, vary the signal generator resistance between 40 and 250 ohms. Verify that the scan tool Fuel Level parameter displays a range that varies between 5 and 95 percent as the signal generator resistance changes.

⇒	If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the fuel level sensor.

Component Testing

1. Ignition OFF, remove the fuel level sender.
2. While sweeping the fuel level sensor through its full range of motion, test for a minimum value of less than 41 ohms and a maximum value greater than 119 ohms between signal terminal B and the low reference terminal C.

⇒	If not within the specified range, replace the fuel level sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

DTC P0464 3.8L, 5.3L, 6.0L, 6.2L, 7.0L Engines

Diagnostic Instructions

DTC Descriptor

DTC P0464: Fuel Level Sensor Circuit Intermittent

Diagnostic Fault Information

Circuit	Short to Ground	High Resistance	Open	Short to Voltage	Signal Performance
Fuel Level Sensor Signal	P0462	1	P0463, P0464	P0463	P0461
Fuel Level Sensor Low Reference	--	1	P0463, P0464	P0463	P0461
1. Fuel Gage Inaccurate or Inoperative

Circuit/System Description

The fuel level sensor changes resistance in response to the fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sensor in order to determine the fuel level. When the fuel tank is full, the sensor resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sensor resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sensor in order to calculate the percentage of fuel remaining in the tank. The PCM sends the fuel level percentage via serial data circuit to the instrument panel cluster (IPC). The PCM sends a serial data message to the IPC in order to display the fuel level in the fuel gage.

This diagnostic tests for an intermittent fuel level sensor signal. If a change in fuel level is detected, DTC P0442 is aborted due to a possible refueling event. If refueling is confirmed, the test for DTC P0464 is considered a pass. The refueling event test must pass two out of three times, otherwise, the DTC P0464 will set indicating an intermittent signal problem.

Conditions for Running the DTC

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Connector End View Reference

Component Connector End Views

Description and Operation

Electrical Information Reference

Scan Tool Reference

Control Module References for Scan Tool Information

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the fuel level sensor.
2. Ignition OFF, test for less than 1 ohm between the fuel level sensor low reference circuit terminal C and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the PCM.

3. Install a Signal Generator and Instrument Panel Tester between the fuel level sensor signal circuit terminal B and the fuel level sensor low reference circuit terminal C.
4. Ignition ON, vary the signal generator resistance between 40 and 250 ohms. Verify that the scan tool Fuel Tank Level Remaining parameter displays a range that varies between 5 and 95 percent as the signal generator resistance changes.

⇒	If not within the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the PCM.

5. If all circuits test normal, test or replace the fuel level sensor.

Component Testing

1. Ignition OFF, remove the fuel level sender.
2. While sweeping the fuel level sensor through its full range of motion, test for a minimum value of less than 41 ohms and a maximum value greater than 119 ohms between signal terminal B and the low reference terminal C.

⇒	If not within the specified range, replace the fuel level sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.