DTC P0464. Pontiac Solstice 2007

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2007 🢒 Solstice 🢒 DTC 🢒 DTC P0464

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor

DTC P0464: Fuel Level Sensor 1 Circuit Intermittent

Diagnostic Fault Information

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

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 fuel level sensor resistance is low and the ECM senses a low signal voltage. When the fuel tank is empty, the fuel level sensor resistance is high and the ECM senses a high signal voltage. The ECM uses the signal circuit of the fuel level sensor in order to calculate the percentage of fuel remaining in the tank. The ECM sends the fuel level information via the serial data circuit to the body control module (BCM). The BCM sends the fuel information to the instrument panel cluster via the serial data circuit in order to control the fuel gage and display the fuel level.

This diagnostic tests for an intermittent fuel level sensor signal. If a change in fuel level is detected, the engine-off natural vacuum small leak test DTC P0442 is aborted due to a refueling event. Before aborting DTC P0442 a refueling event test is executed to confirm that a refueling event has occurred. If refueling is confirmed, the test is considered a pass. Otherwise, the DTC P0464 sets indicating an intermittent signal problem.

Conditions for Running the DTC

•	The ignition is OFF.

•	DTC P0442 is running.

•	DTC P0464 runs and fails 2 out of 3 test cycles.

Conditions for Setting the DTC

•	The fuel level change is greater than 10 percent during engine off test.

•	The above condition is present for greater than 30 seconds.

Action Taken When the DTC Sets

•	DTC P0442 is aborted.

•	The ECM records the operating conditions at the time the diagnostic fails. The ECM displays the failure information in the Failure Records on the scan tool.

Conditions for Clearing the DTC

•	The DTC becomes history when the conditions for setting the DTC are no longer present.

•	The history DTC clears after 40 malfunction free warm-up cycles.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Scan Tool Reference

Control Module References for scan tool information

Special Tools

J 33431-C Instrument Panel Tester

Circuit/System Testing

Ignition OFF, disconnect the harness connector at the fuel level sensor.
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 circuit for an open/high resistance. If the circuits tests normal, replace the ECM.

Install a Signal Generator and Instrument Panel Tester between the fuel level sensor signal circuit terminal B and the low reference circuit terminal C.
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 displaying the specified range, test the signal circuit for an open/high resistance. If the circuit test normal, replace the ECM.

If all circuits test normal, perform the fuel level sensor component test before replacing the fuel level sensor.

Component Testing

Ignition OFF, remove the fuel level sensor.
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.

•	Fuel Level Sensor Replacement

•	Control Module References for the ECM replacement, setup and programming