Fuel Gauge Inaccurate or Inoperative

Fuel Gauge Inaccurate or Inoperative

Diagnostic Instructions

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

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

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

Circuit/System Description

The instrument cluster displays the fuel level based on the information from the engine control module (ECM). The ECM converts the data from the fuel level sensors to a fuel level signal. The ECM sends the fuel level signal via serial data to the body control module (BCM). The BCM then sends the information via serial data to the instrument cluster to display the fuel level. When the fuel level falls below 11% the instrument cluster illuminates the low fuel level indicator.

Reference Information

Schematic Reference

Instrument Cluster Schematics Instrument Cluster Schematics

Connector End View Reference

Component Connector End Views Sunshade - Left Front

Description and Operation

Instrument Cluster Description and Operation Instrument Cluster

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Diagnostic Aids

An incorrectly mounted fuel level sensor can cause the fuel gauge to be innacurate. Verify both fuel level sensors are mounted correctly and there are no obstructions interfering with the sensors.

Circuit/System Verification

1. Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.

• If the low fuel level indicator does not turn ON or OFF as commanded, replace the P16 Instrument Cluster.

2. Observe the scan tool ECM Fuel Level Sensor parameter. The reading should be 0.5-3.5 V and vary with fuel level.

• If the reading does not vary with fuel level, refer to DTC P0461-P0464, P2066, P2067, or P2068 P0461.

3. Observe the scan tool Instrument Cluster Fuel Level Sensor parameter. The reading should be 0-100 percent and vary with fuel level.

• If the reading does not vary with fuel level, refer to DTC P0461-P0464, P2066, P2067, or P2068 P0461.

4. If the Instrument Cluster and ECM fuel level scan tool parameters vary with fuel level appropriately, replace the P16 Instrument Cluster.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Primary Fuel Level Sensor Replacement Primary Fuel Level Sensor Replacement for LF1 and LFW

* Primary Fuel Level Sensor Replacement Primary Fuel Level Sensor Replacement for LAF

* Fuel Tank Fuel Pump Module Replacement - Secondary (Without) Fuel Tank Fuel Pump Module Replacement - Secondary (Without) for LF1 and LFW

* Fuel Tank Fuel Pump Module Replacement - Secondary (With Out) Fuel Tank Fuel Pump Module Replacement - Secondary (Without) For LAF

* Control Module References Control Module References for instrument cluster or ECM replacement, programming and setup