Fuel Gauge Inaccurate or Inoperative
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Fuel Gauge Inaccurate or Inoperative
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Circuit/System Description
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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.
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 Verification
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1.
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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.
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2.
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If the fuel level gauge does not sweep, replace the P16 Instrument Cluster.
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3.
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Command the All Indicators test ON and OFF with the scan tool, verify that the low fuel level indicator turns ON and OFF.
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4.
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If the low fuel level indicator does not turn ON or OFF as commanded, replace the P16 Instrument Cluster.
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5.
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Observe the scan tool ECM Fuel Level Sensor parameter. The reading should be 0.5-3.5 V and vary with fuel level.
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7.
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If the fuel level gauge does sweep and the low fuel level indicator turns ON and OFF, replace the K20 Engine Control Module.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for instrument cluster or ECM replacement, setup, and programming