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Home >> Cadillac >> 2006 >> XLR Base >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Instrument Panel System Displays, Gauges And Console >> Diagnostic Information and Procedures >> DTC P0463 >> Circuit Description

Circuit Description

The primary (left) fuel level sensor measures fuel level changes within the left fuel tank and changes resistance based on fuel level. The engine control module (ECM) monitors changes in the resistance of the sensor to determine fuel level.

When the fuel tank is full, the sensor resistance is high, and the ECM senses 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 inputs from the fuel level sensor to calculate the total fuel remaining in the fuel tanks. This information is then sent to the instrument panel cluster (IPC) via the class 2 serial data circuit.

When the ECM senses a signal voltage higher than the normal operating range of the sensor, this DTC sets.

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