Chevrolet Trax: Fuel gauge malfunction

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.

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 a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal 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 (Encore), Instrument Cluster Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - TRAX

Description and Operation

Instrument Cluster Description and Operation

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

Circuit/System Verification

1. Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that the fuel level gauge sweeps from its low to high position.

• If the fuel level gauge does not sweep

Replace the P16 Instrument Cluster.

• If the fuel level gauge sweeps

2. 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.

• If the low fuel level indicator turns ON and OFF as commanded

3. 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 (FWD), . for FWD or DTC P0461-P0464, P2066, P2067, or P2068 (AWD) for AWD.

• If the reading varies with fuel level

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

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

INSTRUMENT CLUSTER GAUGES MALFUNCTION (ENCORE)

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.

Circuit/System Description

The instrument cluster displays the engine coolant temperature, fuel level, vehicle speed and the engine speed based on the information from the engine control module (ECM). The ECM sends information via a serial data to the body control module (BCM). The BCM then sends the information via serial data to the instrument cluster to display the engine coolant temperature, fuel level, the engine speed, the vehicle speed and the distance travelled, either in kilometers or miles, based on the vehicle requirements.

Reference Information

Schematic Reference

Instrument Cluster Schematics (Encore), Instrument Cluster Schematics (Trax)

Connector End View Reference

WIRING SYSTEMS AND POWER MANAGEMENT - COMPONENT CONNECTOR END VIEWS - INDEX - ENCORE

Description and Operation

Instrument Cluster Description and Operation

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

Circuit/System Verification

1. Verify no DTC is set.

• If any DTC is set

Refer to Diagnostic Trouble Code (DTC) List - Vehicle .

• If no DTCs are set

2. Ignition ON, perform the Instrument Cluster Gauge Sweep test with the scan tool, verify that all gauges sweep from their low to high position.

• If any gauge does not sweep

Replace the P16 Instrument Cluster.

• If all gauges sweep

3. Drive the vehicle, verify the gauge values matches the values on the scan tool.

• If the values do not match

Replace the P16 Instrument Cluster.

• If the values match the scan tool

4. All OK.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the repair.

Control Module References for Instrument Cluster or ECM replacement, programming, and setup.

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